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$283+ Cheap flights from St. Louis (STL) to Barcelona

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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BCN
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Barcelona are usually found in February or November, booked 85 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from St. Louis to Barcelona

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Barcelona (S37). 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 September 11, 2025.

Round-trip from

$524
(Iberia)

One-way from

$283
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$899
From Lambert-St Louis to Barcelona
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One-way flight from Lambert-St Louis to Barcelona
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Highest demand for flights based on searches. 24% potential increase in price ($304 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($44 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from St. Louis to Barcelona

Cheapest flights from St. Louis to Barcelona
Explore the most affordable flight options available from St. Louis to Barcelona. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/11. 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 10/226:30 amSTL - BCN
2 stops18h 20mUnited Airlines
Fri 10/3112:35 pmBCN - STL
2 stops33h 11mUnited Airlines
Deal found 9/11$530
This Gotogate deal was found by Cheapflights users on 9/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/139:15 amSTL - BCN
1 stop17h 05mMultiple Airlines
Wed 10/296:50 amBCN - STL
1 stop14h 05mMultiple Airlines
Deal found 9/11$533
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/216:30 amSTL - BCN
2 stops18h 50mUnited Airlines
Fri 10/3112:35 pmBCN - STL
2 stops33h 11mUnited Airlines
Deal found 9/11$534
This United Airlines deal was found by Cheapflights users on 9/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:30 amSTL - BCN
2 stops13h 20mUnited Airlines
Thu 10/212:10 pmBCN - STL
1 stop14h 47mUnited Airlines
Deal found 9/9$538
This United Airlines deal was found by Cheapflights users on 9/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/231:30 pmSTL - BCN
1 stop11h 20mUnited Airlines
Wed 10/13:15 pmBCN - STL
1 stop14h 20mUnited Airlines
Deal found 9/9$543
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/135:28 pmSTL - BCN
1 stop12h 47mUnited Airlines
Thu 10/233:15 pmBCN - STL
1 stop13h 22mUnited Airlines
Deal found 9/11$544
This Air Canada deal was found by Cheapflights users on 9/10. 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 10/136:30 amSTL - BCN
2 stops19h 50mAir Canada
Thu 10/2312:10 pmBCN - STL
2 stops34h 08mAir Canada
Deal found 9/10$550
This United Airlines deal was found by Cheapflights users on 9/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/219:17 amSTL - BCN
2 stops16h 03mUnited Airlines
Wed 10/111:15 amBCN - STL
2 stops18h 20mUnited Airlines
Deal found 9/9$557
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/225:00 amSTL - BCN
2 stops19h 50mUnited Airlines
Thu 10/303:05 pmBCN - STL
1 stop30h 41mUnited Airlines
Deal found 9/11$558
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/218:00 amSTL - BCN
2 stops17h 20mUnited Airlines
Thu 10/303:05 pmBCN - STL
1 stop30h 41mUnited Airlines
Deal found 9/11$563

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Barcelona 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 September 11, 2025.
Use the filters below to find and compare flights from St. Louis to Barcelona that are best for you.

Fly from

St. Louis

Fly to

Barcelona

Route

Depart

Return

Price

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Wed 10/22

6:30 am-7:50 am

2 stops18h 20m

Barcelona-El Prat

Fri 10/31

12:35 pm-3:46 pm

2 stops33h 11m

$530

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 10/21

6:30 am-8:20 am

2 stops18h 50m

Barcelona-El Prat

Fri 10/31

12:35 pm-3:46 pm

2 stops33h 11m

$534

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 9/23

11:30 am-7:50 am

2 stops13h 20m

Barcelona-El Prat

Thu 10/2

12:10 pm-7:57 pm

1 stop14h 47m

$538

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Wed 9/24

1:30 pm-7:50 am

1 stop11h 20m

Barcelona-El Prat

Thu 10/2

12:10 pm-7:57 pm

1 stop14h 47m

$538

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Mon 9/22

1:30 pm-7:50 am

1 stop11h 20m

Barcelona-El Prat

Fri 10/3

3:15 pm-9:37 pm

1 stop13h 22m

$543

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 9/23

1:30 pm-7:50 am

1 stop11h 20m

Barcelona-El Prat

Wed 10/1

3:15 pm-10:35 pm

1 stop14h 20m

$543

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Wed 9/24

1:30 pm-7:50 am

1 stop11h 20m

Barcelona-El Prat

Wed 10/1

11:15 am-9:37 pm

2 stops17h 22m

$543

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 9/23

1:30 pm-7:50 am

1 stop11h 20m

Barcelona-El Prat

Fri 10/3

11:15 am-9:37 pm

2 stops17h 22m

$543

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 9/21

8:15 am-8:20 am

1 stop17h 05m

Barcelona-El Prat

Fri 10/3

12:00 pm-9:37 pm

2 stops16h 37m

$543

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Mon 9/22

6:35 am-7:50 am

2 stops18h 15m

Barcelona-El Prat

Thu 10/2

12:10 pm-7:57 pm

1 stop14h 47m

$543

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 19 results
1
2

Best time to book a flight from St. Louis to Barcelona

Have a flexible travel schedule? Discover the best time to fly to Barcelona 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

How far ahead should I book a flight from St. Louis to Barcelona?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Barcelona. Price data was last updated on August 29, 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to Barcelona, you should look to book at least 85 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from St. Louis to Barcelona?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Barcelona (average of $523). Flying from St. Louis to Barcelona in June is currently the most expensive (average of $1,059). 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.

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

Find hourly flight availability from St. Louis to Barcelona. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s optimal to fly from St. Louis to Barcelona in the morning. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight in the afternoon.

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

Reviews of airlines servicing Barcelona

Get insights into the airlines that provide service to Barcelona. 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. Reviews last updated September 11, 2025.
See what other customers who have flown with United Airlines, American Airlines, and Air Canada from St. Louis to Barcelona have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.1
Good
10,000 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Iberia
7.0
Good
2,929 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
British Airways
6.7
Okay
7,361 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

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

    If you book a flight to Barcelona from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 0 flights from Lambert-St Louis to Barcelona per day from 8 different airlines.

  • How long is the flight from St. Louis to Barcelona?

    There are many flights that can get you from St. Louis to Barcelona in 18h 20m. Fly via United Airlines to get the fastest option. The distance between St. Louis and Barcelona is about 4638 mi.

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

    United Airlines, at $573, was found to be the cheapest airline from St. Louis to Barcelona.Alternate airlines to your destination round-trip include KLM and British Airways. You may be able to fly from St. Louis to Barcelona for 40% less than the average price by searching for these airlines.

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

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

  • How can I find direct flights from St. Louis to Barcelona?

    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.

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

    Yes. Cheapflights offers flight deals from St. Louis to Barcelona 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?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Barcelona (average of $523). Flying from St. Louis to Barcelona in June is currently the most expensive (average of $1,059). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Barcelona

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

Top 8 airlines flying from St. Louis to Barcelona

Discover the top 8 airlines that operate flights from St. Louis to Barcelona. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$573Average$1,036FlexibilityNo cancel feeOn-time69%
KLMCheapest$590Average$782FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$602Average$939FlexibilityNo cancel feeOn-time70%
DeltaCheapest$602Average$1,040FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$614Average$1,005FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$624Average$1,242FlexibilityNo cancel feeOn-time67%
IberiaCheapest$631Average$1,066FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$648Average$1,098FlexibilityNo cancel feeOn-time71%

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