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 $463 on Iberia. Other airlines that offer cheap prices include Lufthansa from $465 and British Airways from $466 one-way.

What is the cheapest day to fly from St. Louis to Barcelona-El Prat Airport?

Travelers seeking maximum savings on their St. Louis to Barcelona-El Prat Airport flight should consider departing on Monday at noon when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Barcelona-El Prat Airport ranges from 0.8 - 3.6 inches per month. October is typically the wettest month, when rainfall can reach 3.6 in. July is typically the driest time to visit Barcelona-El Prat Airport when rainfall is around 0.8 in.

If weather is an important factor for your trip to Barcelona-El Prat Airport, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 75.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

What are the most popular airlines that fly from St. Louis to Barcelona-El Prat Airport?

Before booking your flight from St. Louis to Barcelona-El Prat Airport check out the most popular airlines for this route: American Airlines, Air Canada or British Airways.

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

Users have found that leaving on a Monday can be a cost-effective option. It’s possible to save up to 31% on your flight compared to booking on days when demand is much higher.

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

Users have found that booking a flight from St. Louis to Barcelona-El Prat Airport at least 25 days early can save you up to 41% on average compared to booking a flight this week. If booking 25 days before your flight isn’t an option for you, users have found flights from St. Louis to Barcelona-El Prat Airport for as little as $749 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 $861 for flights departing within the next 3 days.

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

Our data shows that February tends to be the cheapest month to fly to Barcelona-El Prat Airport from St. Louis. Users have commonly found prices around $968 for the month, but tickets can be as low as $526. Due to multiple factors, prepare for potentially higher prices in June.

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.

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.

$304+ Flights from St. Louis to Barcelona-El Prat Airport

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

Airfare is below average for this route at the moment. St. Louis to Barcelona-El Prat Airport flights typically cost between $685 and $993 in October. The cheapest round-trip price found within the last 3 days was $510 on Iberia (Oct 14-Oct 24).

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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”

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Cheapflights Tip: The best prices from Lambert-St Louis to Barcelona-El Prat 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-El Prat

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-El Prat

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One-way flight from Lambert-St Louis to Barcelona-El Prat

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Highest demand for flights based on searches. 24% potential increase in price ($319 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($43 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Find 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 July 29, 2025.

Tue 10/144:34 pmSTL - BCN

1 stop10h 56mIberia

Fri 10/242:00 pmBCN - STL

1 stop13h 20mIberia

Deal found 7/27

$510

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

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

Mon 9/227:04 pmSTL - BCN

2 stops16h 06mLufthansa

Wed 10/86:50 amBCN - STL

1 stop13h 40mLufthansa

Deal found 7/29

$552

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

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

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

Best flights from St. Louis to Barcelona-El Prat
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 29, 2025.

Tue 10/144:34 pmSTL - BCN

1 stop10h 56mIberia

Fri 10/242:00 pmBCN - STL

1 stop13h 20mIberia

Deal found 7/27

$510

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

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

Mon 9/227:04 pmSTL - BCN

2 stops16h 06mLufthansa

Wed 10/86:50 amBCN - STL

1 stop13h 40mLufthansa

Deal found 7/29

$552

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

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

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

Last-minute flights from St. Louis to Barcelona-El Prat
Discover last-minute flight deals from St. Louis to Barcelona-El Prat. Data last updated July 29, 2025 and is based on user searches.

Tue 8/54:52 pmSTL - BCN

2 stops22h 33mAer Lingus

Tue 8/1211:05 pmBCN - STL

2 stops40h 15mAer Lingus

Deal found 7/28

$1,016

Tue 8/51:30 pmSTL - BCN

1 stop11h 20mMultiple Airlines

Tue 8/1210:20 amBCN - STL

2 stops16h 40mMultiple Airlines

Deal found 7/28

$1,252

Tue 8/51:30 pmSTL - BCN

1 stop11h 20mUnited Airlines

Tue 8/1212:10 pmBCN - STL

1 stop14h 50mUnited Airlines

Deal found 7/28

$1,263

Tue 8/121:30 pmSTL - BCN

1 stop11h 20mAir Canada

Tue 8/1912:10 pmBCN - STL

2 stops34h 34mAir Canada

Deal found 7/29

$685

Tue 8/121:30 pmSTL - BCN

1 stop11h 20mUnited Airlines

Wed 8/2011:15 amBCN - STL

1 stop14h 44mUnited Airlines

Deal found 7/29

$708

Tue 8/124:19 pmSTL - BCN

1 stop11h 11mIberia

Sat 8/235:45 amBCN - STL

2 stops20h 36mIberia

Deal found 7/29

$757

Wed 8/133:30 pmSTL - BCN

2 stops16h 25mLufthansa

Wed 8/2012:50 pmBCN - STL

2 stops33h 54mLufthansa

Deal found 7/29

$773

Thu 8/144:19 pmSTL - BCN

1 stop11h 11mBritish Airways

Sat 8/2312:20 pmBCN - STL

1 stop15h 02mBritish Airways

Deal found 7/29

$823

Fri 8/156:00 pmSTL - BCN

2 stops14h 40mAir France

Thu 8/219:30 amBCN - STL

1 stop18h 57mAir France

Deal found 7/29

$832

Fri 8/153:40 pmSTL - BCN

2 stops34h 10mScandinavian Airlines

Thu 8/217:00 pmBCN - STL

2 stops33h 27mScandinavian Airlines

Deal found 7/29

$962

Fri 8/226:49 pmSTL - BCN

2 stops14h 36mKLM

Sun 8/316:20 amBCN - STL

2 stops15h 10mKLM

Deal found 7/28

$900

Sat 8/233:36 pmSTL - BCN

1 stop32h 39mDelta

Mon 9/111:35 amBCN - STL

1 stop14h 32mDelta

Deal found 7/28

$759

One-way flights from St. Louis to Barcelona-El Prat
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 29, 2025.

Sun 10/1210:35 amSTL - BCN

3 stops55h 40mMultiple Airlines

Deal found 7/28

$304

Tue 11/112:49 pmSTL - BCN

1 stop11h 11mIberia

Deal found 7/29

$463

Mon 11/311:49 amSTL - BCN

1 stop14h 11mLufthansa

Deal found 7/29

$465

Tue 10/214:34 pmSTL - BCN

1 stop10h 56mBritish Airways

Deal found 7/26

$466

Tue 10/211:30 pmSTL - BCN

1 stop12h 50mKLM

Deal found 7/28

$468

Sat 10/114:05 pmSTL - BCN

2 stops32h 45mAir Canada

Deal found 7/29

$470

Fri 8/1511:02 amSTL - BCN

2 stops42h 23mWestJet

Deal found 7/29

$577

Fri 8/151:30 pmSTL - BCN

1 stop11h 20mUnited Airlines

Deal found 7/29

$588

Fri 9/127:16 amSTL - BCN

1 stop19h 54mAmerican Airlines

Deal found 7/27

$618

Cheapflights Fare Finder

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

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

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?

The best time to book flights from St. Louis to Barcelona-El Prat Airport is 85 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 $523). Flying from St. Louis to Barcelona-El Prat Airport 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?

It’s optimal to fly from St. Louis to Barcelona-El Prat Airport 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-El Prat Airport?

Reviews of airlines servicing Barcelona-El Prat

Peruse reviews from past customers who have flown with KLM, United Airlines, and American Airlines 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.

KLM

7.8

Good

1,383 reviews

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

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

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

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

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

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

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.
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 Iberia. Our recent data shows that you can find tickets from as low as $510 on this airline. Additional options worth looking into are United Airlines and Air Canada, starting at $525 and $537 round-trip. Iberia is priced at 47% 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 $463 on Iberia. Other airlines that offer cheap prices include Lufthansa from $465 and British Airways from $466 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 $523). Flying from St. Louis to Barcelona-El Prat Airport 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

Calella

Roses

Castelldefels

Cadaques

L'Hospitalet de Llobregat

El Prat de Llobregat

Badalona

Pineda de Mar

Santa Susanna

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

Airline	Cheapest	Average	Flexibility	On-time
KLM	Cheapest$468	Average$751	FlexibilityNo cancel fee	On-time75%
Lufthansa	Cheapest$527	Average$1,005	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$533	Average$1,025	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$567	Average$1,032	FlexibilityNo cancel fee	On-time69%
British Airways	Cheapest$602	Average$933	FlexibilityNo cancel fee	On-time70%
Air Canada	Cheapest$629	Average$1,242	FlexibilityNo cancel fee	On-time67%
Iberia	Cheapest$631	Average$1,066	FlexibilityNo cancel fee	On-time77%
American Airlines	Cheapest$648	Average$1,090	FlexibilityNo cancel fee	On-time71%

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$304+ 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.

Find cheap flights from St. Louis to Barcelona-El Prat with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Lambert-St Louis to Barcelona-El Prat 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-El Prat

Round-trip from

One-way from

Popular in

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

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 29, 2025.

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 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Barcelona-El Prat Airport that are best for you.

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.

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 July 25, 2025.

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

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

Find hourly flight availability from St. Louis to Barcelona-El Prat. 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.

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

Reviews of airlines servicing Barcelona-El Prat

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?

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

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

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

How can I 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?

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

Traveling to a place near Barcelona-El Prat Airport?

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Alternative routes for St. Louis to Barcelona-El Prat

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

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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 July 29, 2025.