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Cheap flights from St. Louis to Barcelona from $365

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 7/19. 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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Find the cheapest flights from St. Louis to Barcelona

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
5:59 pm - 4:25 pm
STL
-
BCN
15h 26m
2 stops
KLM Logo
6:20 am - 4:42 pm
BCN
-
STL
17h 22m
2 stops
$605KLM
Tue, Apr 14 - Wed, Apr 29
KLM Logo
5:59 pm - 4:25 pm
STL
-
BCN
15h 26m
2 stops
KLM Logo
11:00 am - 3:32 pm
BCN
-
STL
35h 32m
1 stop
$623KLM
Tue, Apr 14 - Wed, Apr 29
Multiple Airlines Logo
5:49 pm - 12:10 pm
STL
-
BCN
11h 21m
1 stop
Multiple Airlines Logo
10:30 am - 10:17 pm
BCN
-
STL
18h 47m
1 stop
$631Multiple Airlines
Tue, Apr 14 - Wed, Apr 29
United Airlines Logo
9:10 am - 9:00 am
STL
-
BCN
16h 50m
2 stops
United Airlines Logo
12:15 pm - 9:13 pm
BCN
-
STL
39h 58m
2 stops
$638United Airlines
Tue, Apr 21 - Tue, Apr 28
United Airlines Logo
6:30 am - 1:15 pm
STL
-
BCN
23h 45m
1 stop
United Airlines Logo
1:15 pm - 12:06 pm
BCN
-
STL
29h 51m
1 stop
$639United Airlines
Sun, Apr 19 - Thu, Apr 30
British Airways Logo
9:35 pm - 6:40 pm
STL
-
BCN
14h 05m
1 stop
British Airways Logo
10:30 am - 10:17 pm
BCN
-
STL
18h 47m
1 stop
$641British Airways
Tue, Apr 21 - Wed, Apr 29
United Airlines Logo
10:00 am - 9:00 am
STL
-
BCN
16h 00m
2 stops
United Airlines Logo
1:15 pm - 10:45 pm
BCN
-
STL
40h 30m
2 stops
$643United Airlines
Tue, Apr 21 - Wed, Apr 29
British Airways Logo
9:35 pm - 10:40 pm
STL
-
BCN
18h 05m
1 stop
British Airways Logo
9:30 pm - 7:30 pm
BCN
-
STL
29h 00m
1 stop
$647British Airways
Tue, Apr 21 - Tue, Apr 28
British Airways Logo
8:54 am - 10:35 am
STL
-
BCN
18h 41m
1 stop
British Airways Logo
10:30 am - 4:41 pm
BCN
-
STL
13h 11m
1 stop
$648British Airways
Wed, Apr 8 - Tue, Apr 14
Iberia Logo
8:03 pm - 9:25 am
STL
-
BCN
30h 22m
2 stops
Iberia Logo
10:30 am - 10:17 pm
BCN
-
STL
18h 47m
1 stop
$650Iberia
Wed, Apr 8 - Wed, Apr 15

United Airlines flights from St. Louis to Barcelona

Our best United Airlines deals on St. Louis to Barcelona flight tickets
United Airlines
Apr 19
STL6:30 amLambert-St Louis
23h 45m
1 stop
BCN1:15 pmBarcelona-El Prat
Apr 30
BCN1:15 pmBarcelona-El Prat
29h 51m
1 stop
STL12:06 pmLambert-St Louis
$639
United Airlines
Apr 21
STL10:00 amLambert-St Louis
16h 00m
2 stops
BCN9:00 amBarcelona-El Prat
Apr 29
BCN1:15 pmBarcelona-El Prat
40h 30m
2 stops
STL10:45 pmLambert-St Louis
$643
United Airlines
Apr 21
STL10:00 amLambert-St Louis
16h 00m
2 stops
BCN9:00 amBarcelona-El Prat
May 1
BCN12:15 pmBarcelona-El Prat
15h 10m
1 stop
STL8:25 pmLambert-St Louis
$651

Delta flights from St. Louis to Barcelona

Our best Delta deals on St. Louis to Barcelona flight tickets
Delta
Apr 19
STL11:42 amLambert-St Louis
18h 08m
1 stop
BCN12:50 pmBarcelona-El Prat
Apr 29
BCN11:00 amBarcelona-El Prat
19h 36m
1 stop
STL11:36 pmLambert-St Louis
$653
Delta
Apr 19
STL6:48 amLambert-St Louis
18h 57m
2 stops
BCN8:45 amBarcelona-El Prat
Apr 29
BCN11:00 amBarcelona-El Prat
13h 44m
1 stop
STL5:44 pmLambert-St Louis
$658
Delta
Apr 22
STL6:25 amLambert-St Louis
19h 20m
1 stop
BCN8:45 amBarcelona-El Prat
May 1
BCN11:00 amBarcelona-El Prat
13h 44m
1 stop
STL5:44 pmLambert-St Louis
$679

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 10, 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 4/14

5:59 pm-4:25 pm

2 stops15h 26m

Barcelona-El Prat

Wed 4/29

6:20 am-4:42 pm

2 stops17h 22m

$605

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/14

5:59 pm-4:25 pm

2 stops15h 26m

Barcelona-El Prat

Wed 4/29

11:00 am-3:32 pm

1 stop35h 32m

$623
Quickest round-trip

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/14

5:49 pm-12:10 pm

1 stop11h 21m

Barcelona-El Prat

Wed 4/29

10:30 am-10:17 pm

1 stop18h 47m

$631

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/21

9:10 am-9:00 am

2 stops16h 50m

Barcelona-El Prat

Tue 4/28

12:15 pm-9:13 pm

2 stops39h 58m

$638

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 4/19

6:30 am-1:15 pm

1 stop23h 45m

Barcelona-El Prat

Thu 4/30

1:15 pm-12:06 pm

1 stop29h 51m

$639

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/21

9:35 pm-6:40 pm

1 stop14h 05m

Barcelona-El Prat

Wed 4/29

10:30 am-10:17 pm

1 stop18h 47m

$641

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/21

10:00 am-9:00 am

2 stops16h 00m

Barcelona-El Prat

Wed 4/29

1:15 pm-10:45 pm

2 stops40h 30m

$643

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Tue 4/21

9:35 pm-10:40 pm

1 stop18h 05m

Barcelona-El Prat

Tue 4/28

9:30 pm-7:30 pm

1 stop29h 00m

$647

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Wed 4/8

8:54 am-10:35 am

1 stop18h 41m

Barcelona-El Prat

Tue 4/14

10:30 am-4:41 pm

1 stop13h 11m

$648

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Wed 4/8

8:03 pm-9:25 am

2 stops30h 22m

Barcelona-El Prat

Wed 4/15

10:30 am-10:17 pm

1 stop18h 47m

$650

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 45m

Direct flights

None
The fastest flight from St. Louis to Barcelona takes 11h 45m
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 45m.

  • 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
7,840 reviews
Search Lufthansa flights
British AirwaysPriceFrom $540Free CancellationRating
6.7
7,781 reviews
Search British Airways flights
DeltaPriceFrom $552Free CancellationRating
7.9
8,276 reviews
Search Delta flights
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,409 reviews
Search United Airlines flights
Air CanadaPriceFrom $593Free CancellationRating
7.1
10,800 reviews
Search Air Canada flights
American AirlinesPriceFrom $629Free CancellationRating
7.1
11,409 reviews
Search American Airlines flights
IberiaPriceFrom $631Free CancellationRating
7.0
3,133 reviews
Search Iberia flights
KLMPriceFrom $634Free CancellationRating
7.8
1,468 reviews
Search KLM 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