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Cheap flights from Knoxville (TYS) to Barcelona-El Prat (BCN) from $541

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
TYS — BCN
jun. 9 — jun. 161
From?
To?
dom. 6/9
dom. 6/16
1 adult, Economy
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Cheap flight deals from Knoxville to Barcelona-El Prat

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Barcelona-El Prat (BCN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated junio 4, 2024.

Popular in

May

Cheapest in

January

Average price

$1,407

Round-trip from

$510
High demand for flights, 31% potential price rise
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Best time to find cheap flights, 34% potential price drop
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Average for round-trip flights in June 2024
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From Knoxville McGhee Tyson to Barcelona-El Prat
Search Deals

What is the cheapest day to fly round-trip from Knoxville to Barcelona-El Prat Airport?

Flights from Knoxville to Barcelona-El Prat Airport are found to be more expensive on Friday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Barcelona-El Prat Airport.

How far in advance should I book a flight from Knoxville to Barcelona-El Prat Airport?

Users have found that booking a flight from Knoxville to Barcelona-El Prat Airport at least 11 days early can save you up to 33% on average compared to booking a flight this week. If booking 11 days before your flight isn’t an option for you, users have found flights from Knoxville to Barcelona-El Prat Airport for as little as $427 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $1,684 for flights departing within the next 3 days.

What is the cheapest month to fly from Knoxville to Barcelona-El Prat Airport?

Due to multiple factors, expect to potentially pay more when booking in May. For low rates, January can be a great choice for travel to Barcelona-El Prat Airport. Flights to Barcelona-El Prat Airport from Knoxville in January are about $1,024 on average during January, but can be found for as low as $550.

What is the cheapest time of day to fly from TYS to BCN?

Unlike at noon, when flights are generally more expensive, you can save up to 11% on flights from Knoxville to Barcelona-El Prat Airport by exploring options for tickets in the afternoon.

Cheap Air Canada flights from Knoxville to Barcelona-El Prat

Explore cheap flight options specifically provided by Air Canada for the route between Knoxville and Barcelona-El Prat. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,824,458 searches. Data last updated junio 4, 2024.
Find some of the cheapest Air Canada flights traveling from Knoxville to Barcelona. Come back soon if you're not finding the exact deal you're looking for.
jue. 10/315:50 amTYS - BCN
2 stops20h 45mAir Canada
jue. 11/79:15 amBCN - TYS
2 stops20h 27mAir Canada
Deal found 6/3$593
jue. 9/269:50 amTYS - BCN
3 stops17h 50mAir Canada
lun. 9/3012:25 pmBCN - TYS
3 stops17h 15mAir Canada
Deal found 6/3$827
mié. 11/132:55 pmTYS - BCN
3 stops17h 10mAir Canada
mar. 11/196:45 amBCN - TYS
3 stops17h 57mAir Canada
Deal found 6/3$917
jue. 7/255:50 amTYS - BCN
2 stops22h 35mAir Canada
dom. 8/412:20 pmBCN - TYS
2 stops58h 36mAir Canada
Deal found 6/3$1,255
jue. 7/259:50 amTYS - BCN
3 stops17h 50mAir Canada
dom. 8/410:25 amBCN - TYS
3 stops19h 18mAir Canada
Deal found 6/3$2,337
lun. 7/19:50 amTYS - BCN
3 stops17h 50mAir Canada
vie. 7/1210:25 amBCN - TYS
3 stops19h 18mAir Canada
Deal found 6/3$3,904

Cheap United Airlines flights from Knoxville to Barcelona-El Prat

Explore cheap flight options specifically provided by United Airlines for the route between Knoxville and Barcelona-El Prat. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,824,458 searches. Data last updated junio 4, 2024.
To aid your search, here are some of the cheapest United Airlines flights we've found from Knoxville to Barcelona. Check back soon if you're not seeing flights that suit your needs.
jue. 10/315:50 amTYS - BCN
1 stop21h 30mUnited Airlines
jue. 11/77:45 amBCN - TYS
2 stops21h 34mUnited Airlines
Deal found 6/3$610
vie. 10/185:50 amTYS - BCN
1 stop20h 30mUnited Airlines
vie. 10/2511:15 amBCN - TYS
1 stop18h 25mUnited Airlines
Deal found 6/3$680
vie. 10/187:00 amTYS - BCN
2 stops19h 20mUnited Airlines
vie. 10/252:50 pmBCN - TYS
2 stops24h 55mUnited Airlines
Deal found 6/3$684
jue. 9/265:50 amTYS - BCN
1 stop20h 30mUnited Airlines
lun. 9/3012:25 pmBCN - TYS
2 stops32h 15mUnited Airlines
Deal found 6/3$794
lun. 7/15:50 amTYS - BCN
2 stops26h 15mUnited Airlines
vie. 7/1212:25 pmBCN - TYS
2 stops40h 17mUnited Airlines
Deal found 6/3$999
jue. 8/297:20 pmTYS - BCN
2 stops16h 50mUnited Airlines
dom. 9/82:50 pmBCN - TYS
1 stop13h 46mUnited Airlines
Deal found 6/3$1,015
lun. 7/12:20 pmTYS - BCN
2 stops17h 45mUnited Airlines
vie. 7/1211:15 amBCN - TYS
1 stop18h 28mUnited Airlines
Deal found 6/3$1,021
jue. 8/295:50 amTYS - BCN
1 stop20h 30mUnited Airlines
dom. 9/82:50 pmBCN - TYS
1 stop13h 46mUnited Airlines
Deal found 6/3$1,040
lun. 7/12:20 pmTYS - BCN
1 stop12h 00mUnited Airlines
vie. 7/1211:15 amBCN - TYS
1 stop18h 28mUnited Airlines
Deal found 6/2$1,209

Cheap Knoxville to Barcelona-El Prat flights in June & July 2024

Find cheap flight options from Knoxville to Barcelona-El Prat specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,824,458 searches. Prices were last updated on junio 4, 2024.
Scroll through some of the best deals on flights from Knoxville to Barcelona in 2024. Check back regularly for other flight deals.
lun. 7/14:40 pmTYS - BCN
2 stops21h 50mBritish Airways
mar. 7/95:10 pmBCN - TYS
2 stops35h 51mBritish Airways
Deal found 6/2$747
lun. 7/14:40 pmTYS - BCN
1 stop11h 50mBritish Airways
mar. 7/95:10 pmBCN - TYS
2 stops35h 51mBritish Airways
Deal found 6/2$749
vie. 6/2811:42 amTYS - BCN
2 stops39h 38mBritish Airways
mié. 7/107:25 pmBCN - TYS
2 stops31h 35mBritish Airways
Deal found 6/3$803
vie. 6/711:06 amTYS - BCN
2 stops13h 39mAmerican Airlines
dom. 6/910:40 amBCN - TYS
2 stops14h 20mAmerican Airlines
Deal found 6/3$809
dom. 6/304:40 pmTYS - BCN
2 stops20h 30mBritish Airways
mar. 7/97:45 amBCN - TYS
2 stops21h 16mBritish Airways
Deal found 6/2$941
dom. 6/303:57 pmTYS - BCN
1 stop11h 03mBritish Airways
mar. 7/97:45 amBCN - TYS
2 stops21h 16mBritish Airways
Deal found 6/2$944
lun. 7/18:10 amTYS - BCN
3 stops29h 45mMultiple Airlines
vie. 7/121:25 pmBCN - TYS
2 stops28h 30mMultiple Airlines
Deal found 6/3$951
vie. 6/286:01 pmTYS - BCN
2 stops22h 34mBritish Airways
mié. 7/109:10 pmBCN - TYS
2 stops26h 27mBritish Airways
Deal found 6/3$989
vie. 6/2811:42 amTYS - BCN
2 stops39h 38mBritish Airways
mar. 7/95:10 pmBCN - TYS
2 stops33h 50mBritish Airways
Deal found 6/3$998

Knoxville to Barcelona-El Prat 2024 flight deals

Discover exclusive flight deals for travel between Knoxville and Barcelona-El Prat in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,824,458 searches. Data last updated junio 4, 2024.
Scroll through some of the best deals on flights from Knoxville to Barcelona in 2024. Check back regularly for other flight deals.
mié. 11/138:36 pmTYS - BCN
2 stops15h 49mAmerican Airlines
mar. 11/1911:00 amBCN - TYS
1 stop18h 24mAmerican Airlines
Deal found 6/3$541
mié. 11/1311:49 amTYS - BCN
2 stops14h 11mKLM
mar. 11/1910:15 amBCN - TYS
2 stops16h 12mKLM
Deal found 6/3$547
mié. 11/1310:55 amTYS - BCN
1 stop16h 05mBritish Airways
mar. 11/191:30 pmBCN - TYS
1 stop13h 08mBritish Airways
Deal found 6/3$581
mié. 11/135:50 amTYS - BCN
2 stops19h 45mMultiple Airlines
mar. 11/196:45 amBCN - TYS
3 stops17h 57mMultiple Airlines
Deal found 6/3$592
jue. 10/315:50 amTYS - BCN
2 stops20h 45mAir Canada
jue. 11/79:15 amBCN - TYS
2 stops20h 27mAir Canada
Deal found 6/3$593
jue. 10/315:50 amTYS - BCN
1 stop21h 30mUnited Airlines
jue. 11/77:45 amBCN - TYS
2 stops21h 34mUnited Airlines
Deal found 6/3$610
jue. 10/313:00 pmTYS - BCN
1 stop13h 00mBritish Airways
jue. 11/71:30 pmBCN - TYS
1 stop33h 59mBritish Airways
Deal found 6/3$626
vie. 10/185:50 amTYS - BCN
1 stop20h 30mUnited Airlines
vie. 10/2511:15 amBCN - TYS
1 stop18h 25mUnited Airlines
Deal found 6/3$680
vie. 10/187:00 amTYS - BCN
2 stops19h 20mUnited Airlines
vie. 10/252:50 pmBCN - TYS
2 stops24h 55mUnited Airlines
Deal found 6/3$684

Find flights from Knoxville to Barcelona-El Prat within your budget

Customize your flight search to find flights from Knoxville to Barcelona-El Prat that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,824,458 searches. Data last updated junio 4, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$541 - $684

Route

Depart

Return

Price

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

mié. 11/13

2 stops15h 49m

Barcelona-El Prat

mar. 11/19

1 stop18h 24m

$541

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

mié. 11/13

2 stops14h 11m

Barcelona-El Prat

mar. 11/19

2 stops16h 12m

$547

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

mié. 11/13

1 stop16h 05m

Barcelona-El Prat

mar. 11/19

1 stop13h 08m

$581

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

mié. 11/13

2 stops19h 45m

Barcelona-El Prat

mar. 11/19

3 stops17h 57m

$592

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

jue. 10/31

2 stops20h 45m

Barcelona-El Prat

jue. 11/7

2 stops20h 27m

$593

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

jue. 10/31

1 stop21h 30m

Barcelona-El Prat

jue. 11/7

2 stops21h 34m

$610

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

jue. 10/31

1 stop13h 00m

Barcelona-El Prat

jue. 11/7

1 stop33h 59m

$626

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

vie. 10/18

1 stop20h 30m

Barcelona-El Prat

vie. 10/25

1 stop18h 25m

$680

Knoxville McGhee TysonBarcelona-El Prat

TYS - BCN

TYSBCN

Knoxville McGhee Tyson

vie. 10/18

2 stops19h 20m

Barcelona-El Prat

vie. 10/25

2 stops24h 55m

$684

Flights are sorted by cheapest first

Deals found on 6/3

How far ahead should I book a flight from Knoxville to Barcelona-El Prat Airport?

Use this chart to determine the optimal time to book a round-trip flight from Knoxville to Barcelona-El Prat. Price data was last updated on May 31, 2024.
Booking 10 days in advance of your planned departure date is, on average, the best time to get cheap flights from Knoxville to Barcelona-El Prat Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Search Deals

What is the cheapest day to fly from Knoxville to Barcelona-El Prat Airport?

Use this chart to determine the cheapest time to fly round-trip from Knoxville to Barcelona-El Prat. Price data was last updated on June 2, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Knoxville to Barcelona-El Prat Airport flight should consider departing on Monday mornings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from Knoxville to Barcelona-El Prat

Have a flexible travel schedule? Discover the best time to fly to Barcelona-El Prat from Knoxville with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in Barcelona-El Prat by month

Plan your trip to Barcelona-El Prat by taking into account the average temperature and rainfall totals by month.

BCN

Temperature

48.2 - 75.2 °F

Reviews of airlines servicing Barcelona-El Prat

Get insights into the airlines that provide service to Barcelona-El Prat. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Barcelona-El Prat. Reviews last updated junio 4, 2024.
To help decide which airline to fly from Knoxville to Barcelona, see what other customers have to say about Air Canada, United Airlines and British Airways. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.9
Good
1,500 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.9

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

KLM
7.9
Good
1,500 reviews
KLM
7.9
Good
1,500 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.9

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

United Airlines
7.4
Good
10,732 reviews
KLM
7.9
Good
1,500 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.9

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

American Airlines
7.3
Good
14,237 reviews
KLM
7.9
Good
1,500 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.9

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

Air Canada
7.0
Good
7,030 reviews
KLM
7.9
Good
1,500 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.9

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

Lufthansa
7.0
Good
7,542 reviews
KLM
7.9
Good
1,500 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.9

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

Related info for your journey

Find useful and relevant information for your journey from Knoxville to Barcelona-El Prat. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Knoxville to Barcelona-El Prat?

    Knoxville McGhee Tyson (TYS) is the airport you will fly out of if you book a flight from Knoxville to Barcelona-El Prat. You should not have trouble finding flights to Barcelona-El Prat from McGhee Tyson; the airport handles an average of 0 outbound flights to Barcelona-El Prat per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the Knoxville airport to Barcelona-El Prat. It is only a 11.3 mi journey to McGhee Tyson (TYS) from Knoxville’s city center.

  • Can I find flights from Knoxville to Barcelona-El Prat Airport for under $600 on Cheapflights?

    Yes, there are multiple flights from Knoxville to Barcelona-El Prat Airport for under $600. The cheapest flight booked recently is on American Airlines for just $541, but on average you can expect to pay $723.

  • What are the cheapest airlines flying from Knoxville to Barcelona-El Prat Airport round-trip?

    Currently priced at $541, American Airlines will fly you from Knoxville to Barcelona-El Prat Airport and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from KLM and British Airways - these airlines can fly you to your destination from $547 and $581, respectively. These flights start at 47% lower than the current average price 3 months from now.

  • What does TYS to BCN mean?

    Knoxville McGhee Tyson Airport is TYS and Barcelona-El Prat Airport is BCN. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.

  • Can I find deals for flights from Knoxville to Barcelona-El Prat that include extra baggage allowance?

    The amount of baggage you can bring on your Knoxville to Barcelona-El Prat flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Knoxville to Barcelona-El Prat with specific airlines?

    Yes, Cheapflights allows you to browse and filter Knoxville to Barcelona-El Prat flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Knoxville to Barcelona-El Prat that include hotel bookings?

    Yes. In addition to deals on Knoxville to Barcelona-El Prat flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Knoxville to Barcelona-El Prat?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Barcelona-El Prat.

  • Can I find deals for business class flights from Knoxville to Barcelona-El Prat?

    Yes. Cheapflights offers flight deals from Knoxville to Barcelona-El Prat by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Knoxville to Barcelona-El Prat that allow pets onboard?

    Many airlines flying from Knoxville to Barcelona-El Prat offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Knoxville to Barcelona-El Prat?

    Yes, you can often find last-minute deals on Knoxville to Barcelona-El Prat flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Knoxville to Barcelona-El Prat Airport flight deals updated?

    The Knoxville to Barcelona-El Prat Airport flight deals you see on this page were last updated on 6/3.

  • What are the most popular airlines that fly from Knoxville to Barcelona-El Prat Airport?

    American Airlines, Air France and British Airways are the most popular airlines when flying from Knoxville to Barcelona-El Prat Airport.

  • What is the cheapest month to book a flight from Knoxville to Barcelona-El Prat Airport?

    Currently, January is the cheapest month in which you can book a flight from Knoxville to Barcelona-El Prat Airport (average of $510). Flying from Knoxville to Barcelona-El Prat Airport in June is currently the most expensive (average of $1,046). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Knoxville to Barcelona-El Prat
See prices for flight routes from nearby airports that may be better suited for you.

Nashville to Barcelona-El Prat flights
Memphis to Barcelona-El Prat flights
Blountville to Barcelona-El Prat flights

Top 5 airlines flying from Knoxville to Barcelona-El Prat

Discover the top 5 airlines that operate flights from Knoxville to Barcelona-El Prat. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,824,458 searches. Data last updated junio 4, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$524Average$952FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$531Average$1,017FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
United AirlinesCheapest$567Average$1,078FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest$676Average$978FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air FranceCheapest$737Average$1,294FlexibilityNo cancel feeOn-time77%
Search Air France flights
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Search flights from Knoxville to Barcelona-El Prat by cabin class

Find flights from Knoxville to Barcelona-El Prat, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Knoxville to Barcelona-El Prat?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Barcelona-El Prat from Knoxville today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Knoxville to Barcelona-El Prat?

Cheapflights helps you find that perfect flight to Barcelona-El Prat from Knoxville by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Knoxville to Barcelona-El Prat with no change fees?

Certainly. Search results for flights to Barcelona-El Prat from Knoxville shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Knoxville to Barcelona-El Prat become cheaper?

Yes! Start tracking prices for Knoxville to Barcelona-El Prat flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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