$296+ 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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BCN
Aug 22 — Aug 291
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Barcelona-El Prat 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.Cheap flight deals from St. Louis to Barcelona-El Prat
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to Barcelona-El PratExplore 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 July 23, 2026.
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 July 23, 2026.
This United Airlines deal was found by Cheapflights users on 7/20. 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 12/66:30 am
STL
- BCN
1 stop18h 50m
United Airlines
Wed 12/91:35 pm
BCN
- STL
2 stops31h 55m
United Airlines
Deal found 7/20![United Airlines logo]()
$753
This Air Canada deal was found by Cheapflights users on 7/18. 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.
Sun 12/67:33 am
STL
- BCN
2 stops19h 02m
Air Canada
Wed 12/91:35 pm
BCN
- STL
2 stops31h 55m
Air Canada
Deal found 7/18![Air Canada logo]()
$756
This Air Canada deal was found by Cheapflights users on 7/21. 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.
Wed 11/118:33 am
STL
- BCN
2 stops18h 02m
Air Canada
Fri 11/201:35 pm
BCN
- STL
2 stops28h 06m
Air Canada
Deal found 7/21![Air Canada logo]()
$761
This Virgin Atlantic deal was found by Cheapflights users on 7/20. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/171:30 pm
STL
- BCN
1 stop12h 10m
Virgin Atlantic
Tue 12/1510:50 am
BCN
- STL
1 stop14h 11m
Virgin Atlantic
Deal found 7/20![Virgin Atlantic logo]()
$769
This United Airlines deal was found by Cheapflights users on 7/21. 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 10/2112:10 pm
STL
- BCN
1 stop12h 50m
United Airlines
Fri 10/306:50 am
BCN
- STL
1 stop13h 55m
United Airlines
Deal found 7/21![United Airlines logo]()
$770
This United Airlines deal was found by Cheapflights users on 7/21. 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 11/47:04 pm
STL
- BCN
1 stop11h 11m
United Airlines
Wed 11/116:50 am
BCN
- STL
1 stop13h 55m
United Airlines
Deal found 7/21![United Airlines logo]()
$771
This United Airlines deal was found by Cheapflights users on 7/20. 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 11/1711:25 am
STL
- BCN
2 stops14h 35m
United Airlines
Tue 12/1510:30 am
BCN
- STL
1 stop15h 08m
United Airlines
Deal found 7/20![United Airlines logo]()
$773
This Gotogate deal was found by Cheapflights users on 7/19. 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 10/1212:10 pm
STL
- BCN
1 stop12h 50m
Multiple Airlines
Tue 10/206:40 am
BCN
- STL
1 stop13h 45m
Multiple Airlines
Deal found 7/19![Multiple Airlines logo]()
$775
This United Airlines deal was found by Cheapflights users on 7/21. 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 10/2012:10 pm
STL
- BCN
1 stop12h 50m
United Airlines
Thu 10/293:10 pm
BCN
- STL
1 stop13h 59m
United Airlines
Deal found 7/21![United Airlines logo]()
$777
Best flights from St. Louis to Barcelona-El PratDiscover carefully curated flight deals from St. Louis to Barcelona-El Prat that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 23, 2026.
Discover carefully curated flight deals from St. Louis to Barcelona-El Prat that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 23, 2026.
This United Airlines deal was found by Cheapflights users on 7/22. 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 12/66:30 am
STL
- BCN
1 stop18h 50m
United Airlines
Wed 12/91:35 pm
BCN
- STL
2 stops31h 55m
United Airlines
Deal found 7/22![United Airlines logo]()
$758
This Virgin Atlantic deal was found by Cheapflights users on 7/20. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/171:30 pm
STL
- BCN
1 stop12h 10m
Virgin Atlantic
Tue 12/1510:50 am
BCN
- STL
1 stop14h 11m
Virgin Atlantic
Deal found 7/20![Virgin Atlantic logo]()
$769
This United Airlines deal was found by Cheapflights users on 7/22. 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 9/237:00 am
STL
- BCN
2 stops18h 00m
United Airlines
Tue 9/2912:15 pm
BCN
- STL
2 stops33h 02m
United Airlines
Deal found 7/22![United Airlines logo]()
$791
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Sat 10/174:50 pm
STL
- BCN
1 stop33h 10m
United Airlines
Wed 10/286:50 am
BCN
- STL
1 stop13h 55m
United Airlines
Deal found 7/20![United Airlines logo]()
$808
This United Airlines deal was found by Cheapflights users on 7/19. 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.
Thu 9/2412:10 pm
STL
- BCN
1 stop12h 50m
United Airlines
Wed 9/3012:15 pm
BCN
- STL
2 stops30h 58m
United Airlines
Deal found 7/19![United Airlines logo]()
$832
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Fri 10/912:10 pm
STL
- BCN
1 stop12h 50m
United Airlines
Tue 10/206:40 am
BCN
- STL
2 stops21h 41m
United Airlines
Deal found 7/20![United Airlines logo]()
$855
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Sat 10/104:50 pm
STL
- BCN
1 stop33h 10m
United Airlines
Sun 10/186:40 am
BCN
- STL
1 stop13h 45m
United Airlines
Deal found 7/20![United Airlines logo]()
$858
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Thu 10/1512:10 pm
STL
- BCN
1 stop12h 50m
United Airlines
Mon 10/263:10 pm
BCN
- STL
1 stop13h 59m
United Airlines
Deal found 7/22![United Airlines logo]()
$907
Last-minute flights from St. Louis to Barcelona-El PratDiscover last-minute flight deals from St. Louis to Barcelona-El Prat. Data last updated July 23, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Barcelona-El Prat. Data last updated July 23, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 7/21. 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 8/1812:10 pm
STL
- BCN
1 stop12h 50m
United Airlines
Wed 8/2612:15 pm
BCN
- STL
1 stop13h 27m
United Airlines
Deal found 7/21![United Airlines logo]()
$886
This Gotogate deal was found by Cheapflights users on 7/22. 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.
Wed 8/1912:10 pm
STL
- BCN
1 stop12h 50m
Multiple Airlines
Sat 8/2912:15 pm
BCN
- STL
1 stop13h 27m
Multiple Airlines
Deal found 7/22![Multiple Airlines logo]()
$918
This FlightHub deal was found by Cheapflights users on 7/22. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:00 am
STL
- BCN
2 stops17h 00m
Air Canada
Sat 8/2912:15 pm
BCN
- STL
2 stops33h 42m
Air Canada
Deal found 7/22![Air Canada logo]()
$937
This Condor deal was found by Cheapflights users on 7/21. 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 Condor is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:00 am
STL
- BCN
2 stops32h 10m
Multiple Airlines
Thu 8/278:00 am
BCN
- STL
2 stops18h 45m
Multiple Airlines
Deal found 7/21![Multiple Airlines logo]()
$911
This Gotogate deal was found by Cheapflights users on 7/19. 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.
Sun 8/238:55 am
STL
- BCN
2 stops16h 05m
Multiple Airlines
Tue 9/86:40 am
BCN
- STL
1 stop13h 45m
Multiple Airlines
Deal found 7/19![Multiple Airlines logo]()
$843
This Delta deal was found by Cheapflights users on 7/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/239:15 am
STL
- BCN
2 stops16h 20m
Delta
Tue 9/81:25 pm
BCN
- STL
2 stops17h 17m
Delta
Deal found 7/19![Delta logo]()
$884
This FlightHub deal was found by Cheapflights users on 7/22. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/263:30 pm
STL
- BCN
1 stop14h 35m
Lufthansa
Sat 9/54:20 pm
BCN
- STL
1 stop28h 05m
Lufthansa
Deal found 7/22![Lufthansa logo]()
$931
This CheapOair deal was found by Cheapflights users on 7/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2612:10 pm
STL
- BCN
1 stop12h 50m
Multiple Airlines
Sat 9/56:40 am
BCN
- STL
2 stops19h 02m
Multiple Airlines
Deal found 7/19![Multiple Airlines logo]()
$934
This United Airlines deal was found by Cheapflights users on 7/21. 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 8/2612:10 pm
STL
- BCN
1 stop12h 50m
United Airlines
Sat 9/511:15 am
BCN
- STL
1 stop14h 56m
United Airlines
Deal found 7/21![United Airlines logo]()
$938
One-way flights from St. Louis to Barcelona-El PratSearch for one-way flight options from St. Louis to Barcelona-El Prat. Find affordable one-way fares based on user searches. Data last updated July 23, 2026.
Search for one-way flight options from St. Louis to Barcelona-El Prat. Find affordable one-way fares based on user searches. Data last updated July 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/18. 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 10/1210:35 am
STL
- BCN
3 stops40h 55m
Multiple Airlines
Deal found 7/18![Multiple Airlines logo]()
$296
This Kiwi.com deal was found by Cheapflights users on 7/20. 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.
Sat 9/1210:35 am
STL
- BCN
3 stops51h 00m
Multiple Airlines
Deal found 7/20![Multiple Airlines logo]()
$327
This Kiwi.com deal was found by Cheapflights users on 7/22. 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.
Sun 9/1310:35 am
STL
- BCN
3 stops46h 30m
Multiple Airlines
Deal found 7/22![Multiple Airlines logo]()
$344
This Orbitz deal was found by Cheapflights users on 7/18. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/265:27 pm
STL
- BCN
2 stops16h 38m
British Airways
Deal found 7/18![British Airways logo]()
$360
This American Airlines deal was found by Cheapflights users on 7/19. 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.
Wed 10/285:40 am
STL
- BCN
1 stop19h 55m
American Airlines
Deal found 7/19![American Airlines logo]()
$362
This Delta deal was found by Cheapflights users on 7/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:28 pm
STL
- BCN
2 stops17h 32m
Delta
Deal found 7/21![Delta logo]()
$366
This KLM deal was found by Cheapflights users on 7/18. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:20 pm
STL
- BCN
2 stops15h 10m
KLM
Deal found 7/18![KLM logo]()
$371
This Kiwi.com deal was found by Cheapflights users on 7/18. 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 10/2610:35 am
STL
- BCN
3 stops44h 40m
Multiple Airlines
Deal found 7/18![Multiple Airlines logo]()
$375
This Kiwi.com deal was found by Cheapflights users on 7/20. 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.
Thu 8/207:58 pm
STL
- BCN
2 stops35h 47m
Multiple Airlines
Deal found 7/20![Multiple Airlines logo]()
$400
This KLM deal was found by Cheapflights users on 7/22. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/93:40 pm
STL
- BCN
1 stop12h 40m
KLM
Deal found 7/22![KLM logo]()
$412
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 July 23, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $753 (United Airlines) |
One-way from | $296 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $1,082 |
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 July 23, 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
Cheapest round-trip
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Sun 12/6
6:30 am-8:20 am
1 stop18h 50m
Barcelona-El Prat
Wed 12/9
1:35 pm-2:30 pm
2 stops31h 55m
$758
Quickest round-trip
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Tue 11/17
1:30 pm-8:40 am
1 stop12h 10m
Barcelona-El Prat
Tue 12/15
10:50 am-6:01 pm
1 stop14h 11m
$769
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Wed 9/23
7:00 am-8:00 am
2 stops18h 00m
Barcelona-El Prat
Tue 9/29
12:15 pm-2:17 pm
2 stops33h 02m
$791
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Sat 10/17
4:50 pm-9:00 am
1 stop33h 10m
Barcelona-El Prat
Wed 10/28
6:50 am-2:45 pm
1 stop13h 55m
$808
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Thu 9/24
12:10 pm-8:00 am
1 stop12h 50m
Barcelona-El Prat
Wed 9/30
12:15 pm-12:13 pm
2 stops30h 58m
$832
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Fri 10/9
12:10 pm-8:00 am
1 stop12h 50m
Barcelona-El Prat
Tue 10/20
6:40 am-9:21 pm
2 stops21h 41m
$855
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Sat 10/10
4:50 pm-9:00 am
1 stop33h 10m
Barcelona-El Prat
Sun 10/18
6:40 am-1:25 pm
1 stop13h 45m
$858
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Thu 10/15
12:10 pm-8:00 am
1 stop12h 50m
Barcelona-El Prat
Mon 10/26
3:10 pm-11:09 pm
1 stop13h 59m
$907
Cheapest one-way
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Wed 10/28
4:13 pm-2:00 pm
2 stops15h 47m
$366
Quickest one-way
St. LouisBarcelona
STL - BCN
STLBCN
Lambert-St Louis
Wed 10/28
7:20 pm-4:30 pm
2 stops15h 10m
$371
Showing 1-10 of 16 resultsSorted by cheapest first
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 July.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Barcelona-El Prat Airport flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on St. Louis-Barcelona-El Prat Airport flight deals on Cheapflights vs. Ovago >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 Ovago the most. Ovago 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.
STL-BCN
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?
The best time to book flights from St. Louis to Barcelona-El Prat Airport is 72 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 $558). Flying from St. Louis to Barcelona-El Prat Airport in June is currently the most expensive (average of $1,461). 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 July 23, 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.
Overall
7.4
Crew
8.1
Entertainment
7.1
Comfort
7.3
Boarding
7.7
Food
6.6
Reviews
1 / 20
6.0
GoodROHIT,Jun 2026
IND - EWR
Overall
7.4
Crew
8.1
Entertainment
7.1
Comfort
7.3
Boarding
7.7
Food
6.6
Reviews
1 / 20
6.0
GoodROHIT,Jun 2026
IND - EWR
Overall
7.4
Crew
8.1
Entertainment
7.1
Comfort
7.3
Boarding
7.7
Food
6.6
Reviews
1 / 20
6.0
GoodROHIT,Jun 2026
IND - EWR
Overall
7.4
Crew
8.1
Entertainment
7.1
Comfort
7.3
Boarding
7.7
Food
6.6
Reviews
1 / 20
6.0
GoodROHIT,Jun 2026
IND - EWR
Overall
7.4
Crew
8.1
Entertainment
7.1
Comfort
7.3
Boarding
7.7
Food
6.6
Reviews
1 / 20
6.0
GoodROHIT,Jun 2026
IND - EWR
Overall
7.4
Crew
8.1
Entertainment
7.1
Comfort
7.3
Boarding
7.7
Food
6.6
Reviews
1 / 20
6.0
GoodROHIT,Jun 2026
IND - EWR
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.
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El Prat de Llobregat
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Top 7 airlines flying from St. Louis to Barcelona-El Prat
Discover the top 7 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 July 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$510 | Average$985 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$540 | Average$962 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$552 | Average$777 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$618 | Average$985 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$624 | Average$1,123 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$629 | Average$981 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$637 | Average$856 | FlexibilityNo cancel fee | On-time77% |