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Barcelona-El Prat

$365+ Cheap flights from St. Louis (STL) to Barcelona-El Prat (BCN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BCN
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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Cheap flight deals from St. Louis to Barcelona-El Prat

Cheapest flights from St. Louis to Barcelona-El Prat
Explore the most affordable flight options available from St. Louis to Barcelona-El Prat. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.

This Flysmarter deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/145:59 pm
STL
-
BCN
2 stops15h 26m
KLM
Wed 4/296:20 am
BCN
-
STL
2 stops17h 22m
KLM
Deal found 3/5$605
This Air Canada deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/284:15 pm
STL
-
BCN
2 stops34h 20m
Air Canada
Thu 12/31:35 pm
BCN
-
STL
2 stops33h 03m
Air Canada
Deal found 3/6$610
This Air Canada deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/512:10 pm
STL
-
BCN
1 stop12h 50m
Air Canada
Tue 10/1312:15 pm
BCN
-
STL
1 stop13h 26m
Air Canada
Deal found 3/9$615
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/295:18 pm
STL
-
BCN
1 stop12h 52m
United Airlines
Fri 12/46:50 am
BCN
-
STL
1 stop14h 05m
United Airlines
Deal found 3/6$617
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/29:23 am
STL
-
BCN
2 stops17h 12m
United Airlines
Fri 12/46:50 am
BCN
-
STL
1 stop14h 05m
United Airlines
Deal found 3/6$620
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/110:23 am
STL
-
BCN
2 stops14h 57m
United Airlines
Fri 12/46:50 am
BCN
-
STL
1 stop14h 05m
United Airlines
Deal found 3/6$621
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/295:18 pm
STL
-
BCN
1 stop12h 52m
United Airlines
Thu 12/35:50 am
BCN
-
STL
2 stops16h 40m
United Airlines
Deal found 3/6$625
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/305:18 pm
STL
-
BCN
1 stop12h 52m
United Airlines
Fri 12/46:50 am
BCN
-
STL
2 stops21h 09m
United Airlines
Deal found 3/6$627
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/111:45 am
STL
-
BCN
2 stops13h 35m
United Airlines
Thu 12/311:00 am
BCN
-
STL
1 stop15h 40m
United Airlines
Deal found 3/6$628
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/78:25 am
STL
-
BCN
1 stop16h 55m
United Airlines
Fri 12/1110:30 am
BCN
-
STL
1 stop30h 18m
United Airlines
Deal found 3/7$629

Find flight deals from St. Louis to Barcelona-El Prat

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) 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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$605
(Flysmarter)

One-way from

$365
(Finnair)

Popular in

June

Cheapest in

January

Average price

$1,020
Provider with most accurate pricing for Lambert-St Louis-Barcelona-El Prat flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Barcelona-El Prat flights.
Search Deals
From Lambert-St Louis to Barcelona-El Prat
Search Deals
One-way flight from Lambert-St Louis to Barcelona-El Prat
Search Deals
Highest demand for flights based on searches. 28% potential increase in price ($338 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis 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 2,558,603 searches. Data last updated March 10, 2026.
Use the filters below to find and compare flights from St. Louis to Barcelona-El Prat Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Mon 3/23

8:17 am-8:20 am

2 stops18h 03m

Barcelona-El Prat

Tue 3/31

12:15 pm-10:45 am

2 stops29h 30m

$792
Quickest round-trip

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Fri 9/4

12:10 pm-8:00 am

1 stop12h 50m

Barcelona-El Prat

Sat 9/12

1:15 pm-8:00 pm

1 stop13h 45m

$828

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 5/17

1:00 pm-8:00 am

1 stop12h 00m

Barcelona-El Prat

Fri 5/29

12:15 pm-12:07 pm

2 stops30h 52m

$858

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sat 7/18

4:13 pm-8:45 am

1 stop33h 32m

Barcelona-El Prat

Tue 8/11

6:10 am-4:49 pm

2 stops17h 39m

$941

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 7/21

9:46 am-12:10 pm

1 stop19h 24m

Barcelona-El Prat

Mon 8/3

6:30 pm-9:16 am

1 stop21h 46m

$962

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sat 7/25

7:23 pm-2:20 pm

1 stop35h 57m

Barcelona-El Prat

Wed 8/5

1:15 pm-2:02 pm

1 stop31h 47m

$984

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Wed 7/22

12:10 pm-8:00 am

1 stop12h 50m

Barcelona-El Prat

Wed 8/5

6:40 am-1:25 pm

1 stop13h 45m

$991

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Fri 7/24

5:45 pm-5:10 pm

2 stops16h 25m

Barcelona-El Prat

Wed 8/5

6:10 am-4:55 pm

2 stops17h 45m

$998
Cheapest one-way
Quickest one-way

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 7/19

11:04 am-1:00 pm

1 stop18h 56m

$365

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 7/19

9:40 pm-11:00 am

1 stop30h 20m

$378

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/5

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

Compare providers for flights from St. Louis to Barcelona-El Prat

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Barcelona-El Prat in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Barcelona-El Prat Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Barcelona-El Prat Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Barcelona-El Prat Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Barcelona-El Prat Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Barcelona-El Prat Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Barcelona-El Prat

Have a flexible travel schedule? Discover the best time to fly to Barcelona-El Prat from St. Louis 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Barcelona-El Prat Airport

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Barcelona-El Prat. Price data was last updated on March 6, 2026.

The best time to book flights from St. Louis to Barcelona-El Prat Airport is 82 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from St. Louis to Barcelona-El Prat Airport?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Barcelona-El Prat Airport (average of $487). Flying from St. Louis to Barcelona-El Prat Airport in June is currently the most expensive (average of $1,072). 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.

How much does it cost to fly round-trip from St. Louis to Barcelona-El Prat Airport?

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 March 10, 2026.
Peruse reviews from past customers who have flown with United Airlines,American Airlines, andAir Canada from St. Louis to Barcelona-El Prat Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,413 reviews

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,413 reviews
United Airlines
7.4
Good
9,413 reviews

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
American Airlines
7.1
Good
11,415 reviews
United Airlines
7.4
Good
9,413 reviews

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Air Canada
7.1
Good
10,800 reviews
United Airlines
7.4
Good
9,413 reviews

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Iberia
7.0
Good
3,133 reviews
United Airlines
7.4
Good
9,413 reviews

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
British Airways
6.7
Okay
7,781 reviews
United Airlines
7.4
Good
9,413 reviews

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from St. Louis 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 St. Louis to Barcelona-El Prat?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to Barcelona-El Prat. You should not have trouble finding flights to Barcelona-El Prat from Lambert-St Louis; 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 8 airlines have flights from the St. Louis airport to Barcelona-El Prat. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

  • How long is the flight from St. Louis to Barcelona-El Prat Airport?

    For as low as $792, United Airlines can have you in Barcelona-El Prat Airport from St. Louis in 18h 03m. There are 4638 mi between St. Louis and Barcelona-El Prat Airport. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Our cheapest airline available from St. Louis to Barcelona-El Prat Airport is Lufthansa. Our recent data shows that you can find tickets from as low as $510 on this airline. Additional options worth looking into are British Airways and Delta, starting at $540 and $552 round-trip. Lufthansa is priced at 40% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from St. Louis to Barcelona-El Prat Airport one-way?

    One-way options have recently been found by users for as low as $292 on Delta. Other airlines that offer cheap prices include Air Canada from $299 and United Airlines from $302 one-way.

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

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

  • How can I find direct flights from St. Louis 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 St. Louis to Barcelona-El Prat.

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

    Yes. Cheapflights offers flight deals from St. Louis 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.

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

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Barcelona-El Prat Airport (average of $487). Flying from St. Louis to Barcelona-El Prat Airport in June is currently the most expensive (average of $1,072). 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

Traveling to a place near Barcelona-El Prat Airport?

Book flights to Barcelona-El Prat Airport if you plan to visit one of these locations
Roses
Calella
L'Hospitalet de Llobregat
Cadaques
El Prat de Llobregat
Badalona
Pineda de Mar

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Barcelona-El Prat

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

Top 8 airlines flying from St. Louis to Barcelona-El Prat

Discover the top 8 airlines that operate flights from St. Louis 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 2,558,603 searches. Data last updated March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$510Average$985FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$540Average$758FlexibilityNo cancel feeOn-time70%
DeltaCheapest$552Average$802FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$560Average$931FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$593Average$1,216FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$629Average$981FlexibilityNo cancel feeOn-time71%
IberiaCheapest$631Average$766FlexibilityNo cancel feeOn-time77%
KLMCheapest$634Average$782FlexibilityNo cancel feeOn-time75%

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