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Cheap flights from St. Louis to Barcelona from $399

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Barcelona departing on 9/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
11:37 am - 2:55 pm
STL
-
BCN
20h 18m
2 stops
Lufthansa Logo
6:40 am - 1:25 pm
BCN
-
STL
13h 45m
1 stop
$713Lufthansa
Tue, Apr 21 - Wed, Apr 29
Lufthansa Logo
11:37 am - 2:55 pm
STL
-
BCN
20h 18m
2 stops
Lufthansa Logo
1:50 pm - 11:11 pm
BCN
-
STL
16h 21m
2 stops
$722Lufthansa
Tue, Apr 21 - Wed, Apr 29
British Airways Logo
9:35 pm - 8:30 pm
STL
-
BCN
15h 55m
1 stop
British Airways Logo
10:30 am - 10:17 pm
BCN
-
STL
18h 47m
1 stop
$741British Airways
Tue, Apr 21 - Wed, Apr 29
Multiple Airlines Logo
9:10 am - 8:00 am
STL
-
BCN
15h 50m
2 stops
Multiple Airlines Logo
6:40 am - 1:25 pm
BCN
-
STL
13h 45m
1 stop
$782Multiple Airlines
Thu, Apr 16 - Wed, Apr 29
Multiple Airlines Logo
9:10 am - 8:00 am
STL
-
BCN
15h 50m
2 stops
Multiple Airlines Logo
1:50 pm - 11:11 pm
BCN
-
STL
16h 21m
2 stops
$786Multiple Airlines
Thu, Apr 16 - Wed, Apr 29
United Airlines Logo
9:10 am - 1:15 pm
STL
-
BCN
21h 05m
1 stop
United Airlines Logo
6:40 am - 1:25 pm
BCN
-
STL
13h 45m
1 stop
$792United Airlines
Thu, Apr 16 - Wed, Apr 29
British Airways Logo
12:27 pm - 11:05 am
STL
-
BCN
15h 38m
2 stops
British Airways Logo
12:50 pm - 7:29 pm
BCN
-
STL
13h 39m
1 stop
$801British Airways
Thu, Apr 16 - Wed, Apr 29
British Airways Logo
2:33 pm - 10:35 am
STL
-
BCN
13h 02m
1 stop
British Airways Logo
12:50 pm - 7:29 pm
BCN
-
STL
13h 39m
1 stop
$803British Airways
Thu, Apr 16 - Wed, Apr 29
United Airlines Logo
9:10 am - 1:15 pm
STL
-
BCN
21h 05m
1 stop
United Airlines Logo
6:40 am - 7:31 pm
BCN
-
STL
19h 51m
2 stops
$806United Airlines
Fri, Apr 17 - Fri, Apr 24
United Airlines Logo
7:45 am - 8:20 am
STL
-
BCN
17h 35m
2 stops
United Airlines Logo
11:15 am - 9:25 am
BCN
-
STL
29h 10m
2 stops
$808United Airlines
Fri, Apr 17 - Fri, Apr 24

British Airways flights from St. Louis to Barcelona

Our best British Airways deals on St. Louis to Barcelona flight tickets
British Airways
Apr 21
STL9:35 pmLambert-St Louis
15h 55m
1 stop
BCN8:30 pmBarcelona-El Prat
Apr 29
BCN10:30 amBarcelona-El Prat
18h 47m
1 stop
STL10:17 pmLambert-St Louis
$741
British Airways
Apr 16
STL12:27 pmLambert-St Louis
15h 38m
2 stops
BCN11:05 amBarcelona-El Prat
Apr 29
BCN12:50 pmBarcelona-El Prat
13h 39m
1 stop
STL7:29 pmLambert-St Louis
$801
British Airways
Apr 16
STL2:33 pmLambert-St Louis
13h 02m
1 stop
BCN10:35 amBarcelona-El Prat
Apr 29
BCN12:50 pmBarcelona-El Prat
13h 39m
1 stop
STL7:29 pmLambert-St Louis
$803

United Airlines flights from St. Louis to Barcelona

Our best United Airlines deals on St. Louis to Barcelona flight tickets
United Airlines
Apr 16
STL9:10 amLambert-St Louis
21h 05m
1 stop
BCN1:15 pmBarcelona-El Prat
Apr 29
BCN6:40 amBarcelona-El Prat
13h 45m
1 stop
STL1:25 pmLambert-St Louis
$792
United Airlines
Apr 17
STL9:10 amLambert-St Louis
21h 05m
1 stop
BCN1:15 pmBarcelona-El Prat
Apr 24
BCN6:40 amBarcelona-El Prat
19h 51m
2 stops
STL7:31 pmLambert-St Louis
$806
United Airlines
Apr 17
STL7:45 amLambert-St Louis
17h 35m
2 stops
BCN8:20 amBarcelona-El Prat
Apr 24
BCN11:15 amBarcelona-El Prat
29h 10m
2 stops
STL9:25 amLambert-St Louis
$808

momondo 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, momondo users made 832,500 searches. Data last updated March 23, 2026.
Use the filters below to find and compare flights from St. Louis to Barcelona that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/21

11:37 am-2:55 pm

2 stops20h 18m

Barcelona-El Prat

Wed 4/29

6:40 am-1:25 pm

1 stop13h 45m

$713

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/21

11:37 am-2:55 pm

2 stops20h 18m

Barcelona-El Prat

Wed 4/29

1:50 pm-11:11 pm

2 stops16h 21m

$722

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/21

9:35 pm-8:30 pm

1 stop15h 55m

Barcelona-El Prat

Wed 4/29

10:30 am-10:17 pm

1 stop18h 47m

$741

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Thu 4/16

9:10 am-8:00 am

2 stops15h 50m

Barcelona-El Prat

Wed 4/29

6:40 am-1:25 pm

1 stop13h 45m

$782

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Thu 4/16

9:10 am-8:00 am

2 stops15h 50m

Barcelona-El Prat

Wed 4/29

1:50 pm-11:11 pm

2 stops16h 21m

$786

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Thu 4/16

9:10 am-1:15 pm

1 stop21h 05m

Barcelona-El Prat

Wed 4/29

6:40 am-1:25 pm

1 stop13h 45m

$792

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Thu 4/16

12:27 pm-11:05 am

2 stops15h 38m

Barcelona-El Prat

Wed 4/29

12:50 pm-7:29 pm

1 stop13h 39m

$801
Quickest round-trip

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Thu 4/16

2:33 pm-10:35 am

1 stop13h 02m

Barcelona-El Prat

Wed 4/29

12:50 pm-7:29 pm

1 stop13h 39m

$803

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Fri 4/17

9:10 am-1:15 pm

1 stop21h 05m

Barcelona-El Prat

Fri 4/24

6:40 am-7:31 pm

2 stops19h 51m

$806

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Fri 4/17

7:45 am-8:20 am

2 stops17h 35m

Barcelona-El Prat

Fri 4/24

11:15 am-9:25 am

2 stops29h 10m

$808

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Barcelona from

How to get the cheapest flight ticket from St. Louis to Barcelona

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Barcelona?

What is the cheapest month to fly to Barcelona?

The month of January is, on average, the cheapest month to fly to Barcelona from St. Louis, with most prices found around $505. If you don’t want to visit Barcelona in January, then you should wait until November to fly from St. Louis, when ticket prices are also cheap, with an average price of $663.

How far in advance should I book a flight to Barcelona?

You are more likely to see cheaper flights to Barcelona from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Barcelona for around $855 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Barcelona from St. Louis for as low as $628 on momondo.

Cheap St. Louis to Barcelona flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Barcelona

Fastest flight time

11h 55m

Direct flights

None
The fastest flight from St. Louis to Barcelona takes 11h 55m
There are no direct flights from St. Louis to Barcelona. There are no popular flight routes from St. Louis to Barcelona.
Search flight deals

  • How far is Lambert-St Louis to Barcelona by plane?

    The straight-line distance from Lambert-St Louis to Barcelona is 4636.1 mi. In terms of flight time, this usually takes a little over 11h 55m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Barcelona?

    Prices for flights from Lambert-St Louis Airport to Barcelona were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Barcelona?

  • How old do you have to be to fly from Lambert-St Louis Airport to Barcelona?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Barcelona.

  • What documentation or ID do you need to fly to Barcelona?

    The necessary travel and health documents for your Barcelona trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to Barcelona

Compare and see reviews for airlines that fly from St. Louis to Barcelona with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $510Free CancellationRating
6.8
7,863 reviews
Search Lufthansa flights
British AirwaysPriceFrom $540Free CancellationRating
6.7
7,812 reviews
Search British Airways flights
DeltaPriceFrom $552Free CancellationRating
7.9
8,317 reviews
Search Delta flights
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,464 reviews
Search United Airlines flights
Air CanadaPriceFrom $593Free CancellationRating
7.1
10,835 reviews
Search Air Canada flights
American AirlinesPriceFrom $607Free CancellationRating
7.1
11,488 reviews
Search American Airlines flights
IberiaPriceFrom $631Free CancellationRating
7.0
3,148 reviews
Search Iberia flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Barcelona?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Barcelona. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to Barcelona with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Barcelona flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Barcelona?

Once all potential St. Louis to Barcelona flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Barcelona right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to Barcelona now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Barcelona and let you know when they change.

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Find better results for your trip to Spain

Fly into one of these airports located in Barcelona

Airports listed have a maximum distance of 46.7 mi from Barcelona
Barcelona-El Prat Airport
Girona Costa Brava Airport