HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Barcelona

$304+ 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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BCN
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Barcelona with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Lambert-St Louis to Barcelona are usually found in February or October, 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 July 29, 2025.

Round-trip from

$510
(eDestinos)

One-way from

$304
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,186
From Lambert-St Louis to Barcelona
Search Deals
One-way flight from Lambert-St Louis to Barcelona
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($319 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 July 29, 2025.

This eDestinos deal was found by Cheapflights users on 7/27. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/144:34 pmSTL - BCN
1 stop10h 56mIberia
Fri 10/242:00 pmBCN - STL
1 stop13h 20mIberia
Deal found 7/27$510
This lol.travel deal was found by Cheapflights users on 7/28. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:04 pmSTL - BCN
2 stops29h 46mUnited Airlines
Wed 10/812:10 pmBCN - STL
1 stop14h 47mUnited Airlines
Deal found 7/28$525
This AirNGo deal was found by Cheapflights users on 7/28. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/221:30 pmSTL - BCN
1 stop11h 20mAir Canada
Wed 10/812:10 pmBCN - STL
1 stop14h 47mAir Canada
Deal found 7/28$537
This Kiwi.com deal was found by Cheapflights users on 7/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:04 pmSTL - BCN
2 stops16h 06mLufthansa
Wed 10/86:50 amBCN - STL
1 stop13h 40mLufthansa
Deal found 7/29$552
This Booking.com deal was found by Cheapflights users on 7/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/189:20 amSTL - BCN
2 stops39h 30mMultiple Airlines
Wed 10/296:50 amBCN - STL
1 stop14h 05mMultiple Airlines
Deal found 7/27$578
This Travelocity deal was found by Cheapflights users on 7/28. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/221:03 pmSTL - BCN
2 stops21h 37mBritish Airways
Mon 10/279:00 pmBCN - STL
2 stops27h 36mBritish Airways
Deal found 7/28$612
This American Airlines deal was found by Cheapflights users on 7/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/196:00 amSTL - BCN
1 stop20h 05mAmerican Airlines
Thu 10/212:20 pmBCN - STL
1 stop14h 13mAmerican Airlines
Deal found 7/27$658

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 July 29, 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

Tue 10/14

4:34 pm-10:30 am

1 stop10h 56m

Barcelona-El Prat

Fri 10/24

2:00 pm-8:20 pm

1 stop13h 20m

$510

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Mon 9/22

7:04 pm-7:50 am

2 stops29h 46m

Barcelona-El Prat

Wed 10/8

12:10 pm-7:57 pm

1 stop14h 47m

$525

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Mon 9/22

1:30 pm-7:50 am

1 stop11h 20m

Barcelona-El Prat

Wed 10/8

12:10 pm-7:57 pm

1 stop14h 47m

$537

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Mon 9/22

7:04 pm-6:10 pm

2 stops16h 06m

Barcelona-El Prat

Wed 10/8

6:50 am-1:30 pm

1 stop13h 40m

$552

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sat 10/18

9:20 am-7:50 am

2 stops39h 30m

Barcelona-El Prat

Wed 10/29

6:50 am-2:55 pm

1 stop14h 05m

$578

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Mon 9/22

1:03 pm-5:40 pm

2 stops21h 37m

Barcelona-El Prat

Mon 10/27

9:00 pm-6:36 pm

2 stops27h 36m

$612

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Fri 9/19

6:00 am-9:05 am

1 stop20h 05m

Barcelona-El Prat

Thu 10/2

12:20 pm-7:33 pm

1 stop14h 13m

$658

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 10/12

10:35 am-1:15 am

3 stops55h 40m

$304

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 11/11

2:49 pm-9:00 am

1 stop11h 11m

$463

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Mon 11/3

11:49 am-9:00 am

1 stop14h 11m

$465

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 16 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 July 25, 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 $1,056). 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 July 29, 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 July 29, 2025.
See what other customers who have flown with KLM, United Airlines, and American Airlines 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.
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,383 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,899 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
American Airlines
7.2
Good
10,000 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
WestJet
7.2
Good
2,973 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Air Canada
7.1
Good
9,822 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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.

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

    Iberia, at $510, was found to be the cheapest airline from St. Louis to Barcelona.Alternate airlines to your destination round-trip include United Airlines and Air Canada. You may be able to fly from St. Louis to Barcelona for 47% less than the average price by searching for these airlines.

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

    The cheapest airlines for a one-way flight from St. Louis to Barcelona are Iberia ($463), Lufthansa ($465), and British Airways ($466).

  • 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 $1,056). 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.
St. Louis to Barcelona-El Prat flights
Kansas City 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$468Average$751FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$527Average$1,005FlexibilityNo cancel feeOn-time76%
DeltaCheapest$533Average$1,025FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$567Average$1,032FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$602Average$933FlexibilityNo cancel feeOn-time70%
Air CanadaCheapest$629Average$1,242FlexibilityNo cancel feeOn-time67%
IberiaCheapest$631Average$1,066FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$648Average$1,090FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.