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Cheap flights from St. Louis to Barcelona from $351

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 8/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
Lufthansa Logo
3:30 pm - 3:35 pm
STL
-
BCN
17h 05m
1 stop
Lufthansa Logo
6:40 am - 1:25 pm
BCN
-
STL
13h 45m
1 stop
$766Lufthansa
Sun, Sep 20 - Sun, Sep 27
Lufthansa Logo
3:30 pm - 7:45 pm
STL
-
BCN
21h 15m
1 stop
Lufthansa Logo
6:40 am - 3:38 pm
BCN
-
STL
15h 58m
2 stops
$775Lufthansa
Sun, Sep 20 - Sun, Sep 27
Lufthansa Logo
3:30 pm - 3:35 pm
STL
-
BCN
17h 05m
1 stop
Lufthansa Logo
6:40 am - 1:25 pm
BCN
-
STL
13h 45m
1 stop
$812Lufthansa
Sun, Sep 20 - Sun, Sep 27
Iberia Logo
9:40 pm - 6:25 pm
STL
-
BCN
13h 45m
1 stop
Iberia Logo
10:30 am - 8:03 pm
BCN
-
STL
16h 33m
1 stop
$813Iberia
Sun, Sep 13 - Fri, Sep 18
Iberia Logo
8:07 pm - 6:25 pm
STL
-
BCN
15h 18m
2 stops
Iberia Logo
10:30 am - 8:03 pm
BCN
-
STL
16h 33m
1 stop
$817Iberia
Sun, Sep 13 - Fri, Sep 18
Multiple Airlines Logo
8:55 am - 8:00 am
STL
-
BCN
16h 05m
2 stops
Multiple Airlines Logo
1:15 pm - 11:27 pm
BCN
-
STL
17h 12m
2 stops
$818Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
Lufthansa Logo
3:30 pm - 6:15 pm
STL
-
BCN
19h 45m
1 stop
Lufthansa Logo
6:40 am - 3:38 pm
BCN
-
STL
15h 58m
2 stops
$821Lufthansa
Sun, Sep 20 - Sun, Sep 27
United Airlines Logo
9:10 am - 1:15 pm
STL
-
BCN
21h 05m
1 stop
United Airlines Logo
12:15 pm - 7:27 pm
BCN
-
STL
38h 12m
2 stops
$833United Airlines
Fri, Apr 24 - Fri, May 1
United Airlines Logo
9:10 am - 8:20 am
STL
-
BCN
16h 10m
2 stops
United Airlines Logo
12:15 pm - 7:27 pm
BCN
-
STL
38h 12m
2 stops
$838United Airlines
Fri, Apr 24 - Fri, May 1
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
$839United Airlines
Sun, Apr 26 - Sun, May 3

United Airlines flights from St. Louis to Barcelona-El Prat Airport

Our best United Airlines deals on St. Louis to Barcelona-El Prat Airport flight tickets
United Airlines
Apr 24
STL9:10 amLambert-St Louis
21h 05m
1 stop
BCN1:15 pmBarcelona-El Prat
May 1
BCN12:15 pmBarcelona-El Prat
38h 12m
2 stops
STL7:27 pmLambert-St Louis
$833
United Airlines
Apr 24
STL9:10 amLambert-St Louis
16h 10m
2 stops
BCN8:20 amBarcelona-El Prat
May 1
BCN12:15 pmBarcelona-El Prat
38h 12m
2 stops
STL7:27 pmLambert-St Louis
$838
United Airlines
Apr 26
STL6:30 amLambert-St Louis
23h 45m
1 stop
BCN1:15 pmBarcelona-El Prat
May 3
BCN1:15 pmBarcelona-El Prat
29h 51m
1 stop
STL12:06 pmLambert-St Louis
$839

Air Canada flights from St. Louis to Barcelona-El Prat Airport

Our best Air Canada deals on St. Louis to Barcelona-El Prat Airport flight tickets
Air Canada
May 9
STL5:28 pmLambert-St Louis
31h 32m
2 stops
BCN8:00 amBarcelona-El Prat
May 20
BCN12:15 pmBarcelona-El Prat
15h 10m
1 stop
STL8:25 pmLambert-St Louis
$875
Air Canada
Sep 1
STL5:00 amLambert-St Louis
20h 00m
2 stops
BCN8:00 amBarcelona-El Prat
Sep 15
BCN12:15 pmBarcelona-El Prat
34h 23m
2 stops
STL3:38 pmLambert-St Louis
$899
Air Canada
May 9
STL6:30 amLambert-St Louis
18h 30m
2 stops
BCN8:00 amBarcelona-El Prat
May 20
BCN12:15 pmBarcelona-El Prat
34h 31m
2 stops
STL3:46 pmLambert-St Louis
$901

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Barcelona-El Prat Airport 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 28, 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

Price

Cheapest round-trip

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 9/20

3:30 pm-3:35 pm

1 stop17h 05m

Barcelona-El Prat

Sun 9/27

6:40 am-1:25 pm

1 stop13h 45m

$766

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 9/20

3:30 pm-7:45 pm

1 stop21h 15m

Barcelona-El Prat

Sun 9/27

6:40 am-3:38 pm

2 stops15h 58m

$775

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 9/20

3:30 pm-3:35 pm

1 stop17h 05m

Barcelona-El Prat

Sun 9/27

6:40 am-1:25 pm

1 stop13h 45m

$812
Quickest round-trip

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 9/13

9:40 pm-6:25 pm

1 stop13h 45m

Barcelona-El Prat

Fri 9/18

10:30 am-8:03 pm

1 stop16h 33m

$813

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 9/13

8:07 pm-6:25 pm

2 stops15h 18m

Barcelona-El Prat

Fri 9/18

10:30 am-8:03 pm

1 stop16h 33m

$817

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 9/20

8:55 am-8:00 am

2 stops16h 05m

Barcelona-El Prat

Sun 9/27

1:15 pm-11:27 pm

2 stops17h 12m

$818

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 9/20

3:30 pm-6:15 pm

1 stop19h 45m

Barcelona-El Prat

Sun 9/27

6:40 am-3:38 pm

2 stops15h 58m

$821

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Fri 4/24

9:10 am-1:15 pm

1 stop21h 05m

Barcelona-El Prat

Fri 5/1

12:15 pm-7:27 pm

2 stops38h 12m

$833

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Fri 4/24

9:10 am-8:20 am

2 stops16h 10m

Barcelona-El Prat

Fri 5/1

12:15 pm-7:27 pm

2 stops38h 12m

$838

St. LouisBarcelona

STL - BCN

STLBCN

Lambert-St Louis

Sun 4/26

6:30 am-1:15 pm

1 stop23h 45m

Barcelona-El Prat

Sun 5/3

1:15 pm-12:06 pm

1 stop29h 51m

$839

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Barcelona-El Prat Airport

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-El Prat Airport?

What is the cheapest month to fly to Barcelona-El Prat Airport?

The cheapest month to fly to Barcelona-El Prat Airport from St. Louis is in January. Flight prices, which tend to average around $505, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Barcelona-El Prat Airport from St. Louis during November instead. Flights to Barcelona-El Prat Airport in November, while not as cheap as those in January, still average around $663.

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

You are more likely to see cheaper flights to Barcelona-El Prat Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Barcelona-El Prat Airport 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-El Prat Airport from St. Louis for as low as $628 on momondo.

Can stopping save me money on St. Louis to Barcelona-El Prat Airport flights?

You could potentially save up to 47% on your flight if you consider stops on a St. Louis to Barcelona-El Prat Airport flight.

How have St. Louis to Barcelona-El Prat Airport flight prices changed over time?

As of March 2026, prices for St. Louis to Barcelona-El Prat Airport flights are approximately 28% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to Barcelona-El Prat Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Barcelona-El Prat Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Barcelona-El Prat Airport (STL to BCN) flight deals and tips

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

Fastest flight time

12h 50m

Direct flights

None
The fastest flight from St. Louis to Barcelona-El Prat Airport takes 12h 50m
There are no direct flights from St. Louis to Barcelona-El Prat Airport. There are no popular flight routes from St. Louis to Barcelona-El Prat Airport.
Search flight deals

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

    There are 4635.1 mi between Lambert-St Louis and Barcelona-El Prat. Flights usually cover this in 12h 50m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Lambert-St Louis Airport to Barcelona-El Prat Airport are refreshed on a daily basis.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Barcelona-El Prat Airport.

  • What documentation or ID do you need to fly to Barcelona-El Prat Airport?

    The travel and health documents required for your trip to Barcelona-El Prat Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Barcelona-El Prat Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Barcelona-El Prat Airport?

Best airlines flying from St. Louis to Barcelona-El Prat Airport

Compare and see reviews for airlines that fly from St. Louis to Barcelona-El Prat Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $510Free CancellationRating
6.8
7,871 reviews
Search Lufthansa flights
British AirwaysPriceFrom $540Free CancellationRating
6.7
7,825 reviews
Search British Airways flights
DeltaPriceFrom $552Free CancellationRating
7.9
8,353 reviews
Search Delta flights
Air CanadaPriceFrom $560Free CancellationRating
7.1
10,853 reviews
Search Air Canada flights
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,500 reviews
Search United Airlines flights
American AirlinesPriceFrom $607Free CancellationRating
7.1
11,520 reviews
Search American Airlines flights
IberiaPriceFrom $631Free CancellationRating
7.0
3,157 reviews
Search Iberia flights

Traveling to a place near Barcelona?

Book flights to Barcelona if you plan to visit one of these locations
Lloret de Mar
Sitges
Salou
Tossa de Mar
Castelldefels
Tarragona
El Prat de Llobregat
L'Hospitalet de Llobregat
Calella
Santa Susanna
Cadaques
Cambrils
Badalona
Pals
Pineda de Mar
Empuriabrava
Roses
Calella de Palafrugell
Palafrugell
Malgrat de Mar

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?

Flights from St. Louis to Barcelona with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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?

Of course. momondo tracks the price of St. Louis to Barcelona flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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