STL - BCN

$263 Find Cheap Flights from St. Louis to Barcelona

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Barcelona departing on 3/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Barcelona-El Prat Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Barcelona.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Barcelona.
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Everything you should know

Cheapest round-trip
$420
Typical prices: $614-$688
Air Canada
Sun 2/1Tue 2/17
STL - BCN • 2 stops
Cheapest one-way
$263
Typical prices: $590-$632
British Airways
Sat 3/21
STL - BCN • 1 stop
Top airlines
Air Canada
Cheapest • from $420 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 16% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 28% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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We hope you love your trip to Barcelona!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Barcelona (STL-BCN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Barcelona that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Barcelona

Sun, Feb 1 - Tue, Feb 17
Air Canada Logo
4:05 pm - 9:35 am
STL
-
BCN
34h 30m2 stops
Air Canada Logo
1:35 pm - 9:00 pm
BCN
-
STL
38h 25m2 stops
$420Air Canada
Wed, Mar 4 - Tue, Mar 10
Delta Logo
6:30 am - 8:00 am
STL
-
BCN
18h 30m1 stop
Delta Logo
9:15 am - 8:44 am
BCN
-
STL
29h 29m1 stop
$425Delta
Wed, Jan 14 - Sun, Jan 25
Lufthansa Logo
11:22 am - 1:00 pm
STL
-
BCN
18h 38m2 stops
Lufthansa Logo
6:50 am - 1:55 pm
BCN
-
STL
14h 05m1 stop
$433Lufthansa
Sun, Feb 1 - Tue, Feb 17
Multiple Airlines Logo
11:55 am - 8:50 am
STL
-
BCN
13h 55m1 stop
Multiple Airlines Logo
11:00 am - 10:05 pm
BCN
-
STL
18h 05m1 stop
$434Multiple Airlines
Sun, Feb 1 - Tue, Feb 17
Multiple Airlines Logo
6:00 am - 9:00 am
STL
-
BCN
20h 00m1 stop
Multiple Airlines Logo
11:00 am - 11:18 pm
BCN
-
STL
19h 18m2 stops
$438Multiple Airlines
Wed, Jan 14 - Sun, Jan 25
Lufthansa Logo
3:50 pm - 1:00 pm
STL
-
BCN
14h 10m1 stop
Lufthansa Logo
6:50 am - 1:55 pm
BCN
-
STL
14h 05m1 stop
$449Lufthansa
Wed, Feb 4 - Thu, Feb 19
Air Canada Logo
10:10 am - 9:35 am
STL
-
BCN
16h 25m2 stops
Air Canada Logo
1:35 pm - 9:00 pm
BCN
-
STL
38h 25m2 stops
$468Air Canada
Sun, Feb 1 - Tue, Feb 17
Air Canada Logo
4:05 pm - 9:35 am
STL
-
BCN
34h 30m2 stops
Air Canada Logo
1:35 pm - 9:00 pm
BCN
-
STL
38h 25m2 stops
$470Air Canada
Thu, Jan 15 - Sun, Feb 1
British Airways Logo
12:11 pm - 11:25 am
STL
-
BCN
16h 14m2 stops
British Airways Logo
10:40 am - 10:59 pm
BCN
-
STL
19h 19m1 stop
$472British Airways
Wed, Feb 4 - Thu, Feb 19
Finnair Logo
10:00 am - 1:05 pm
STL
-
BCN
20h 05m1 stop
Finnair Logo
10:40 am - 7:25 pm
BCN
-
STL
15h 45m1 stop
$477Finnair
Booking Insights

KAYAK's insights & trends for St. Louis to Barcelona flights

Get data-powered insights and trends into flights from St. Louis to Barcelona to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from St. Louis to Barcelona-El Prat Airport?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Barcelona-El Prat Airport departing in February.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Barcelona-El Prat Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Barcelona-El Prat Airport is February, where tickets cost $657 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,293 and $1,236 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Barcelona-El Prat Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Barcelona-El Prat Airport, you should book around 3 weeks before departure, which saves you about 16% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$263
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly and prices are also 2% lower on average.
Flight from St. Louis to Barcelona

When to book flights from St. Louis to Barcelona

Are your dates flexible? Find out the best times to travel from St. Louis to Barcelona based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking St. Louis to Barcelona flights

  • What is the carry-on policy on Lufthansa Airlines?

    If you are traveling in Economy, you are allowed one carry-on bag and one personal item. With a Business or First Class ticket, you can bring two bags onboard. The personal item should not be bigger than 11.8 × 15.7 × 3.9 inches in size, while the bags must not exceed 21.6 × 15.7 × 9 inches in dimensions.

  • Is Delta an eco-friendly airline?

    Delta is one of the most sustainable airlines in the aviation world. In attempts to minimize the impact of their services on the environment, it has invested in a modern fuel-efficient fleet, sustainable aviation fuel (SAF) development, and efficient waste management and recycling programs. Additionally, it has partnered with several environmental groups.

  • What is the easiest way to travel from Barcelona El Prat Airport (BCN) using public transport?

    Taking a bus from the airport is the easiest way to get to the city center if you don’t have a car. There are three available bus transits from the airport: Aerobus, bus number 46, and the night bus N16, N17, or N18. The buses can be found in Terminal 1 and Terminal 2.

  • Can I rent a car at Barcelona El Prat Airport (BCN)?

    At BCN, you can rent a car of your choice with ease. This is because in both of its Terminals, there are counters for Avis, Budget, Enterprise, InterRent, Hertz, Thrifty, Sixt, Firefly, and Goldcar. The pickup lot for the terminals is a short distance from the terminals. Because of the locations of the counters and pickup lot, you won’t need ground transportation to get to either.

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

    In the last 3 days, the lowest price for a flight from St. Louis to Barcelona-El Prat Airport was $263 for a one-way ticket and $420 for a round-trip.

  • Do I need a passport to fly between St. Louis and Barcelona?

    A passport is required to fly from St. Louis to Barcelona.

  • Which airports will I be using when flying from St. Louis to Barcelona?

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at Barcelona, also known as Barcelona-El Prat.

  • Which aircraft models fly most regularly from St. Louis to Barcelona?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Barcelona?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between St. Louis and Barcelona, with SkyTeam being the most commonly used for this route.

  • What is the most popular layover when flying to Barcelona from St. Louis?

    Chicago is the most popular layover city among KAYAK users traveling from St. Louis to Barcelona.

  • Which is the best airline for flights from St. Louis to Barcelona, Delta or KLM?

    The two airlines most popular with KAYAK users for flights from St. Louis to Barcelona are Delta and KLM. With an average price for the route of $984 and an overall rating of 7.9, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $745 and an overall rating of 7.7.

  • How does KAYAK find such low prices on flights from St. Louis to Barcelona?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Barcelona.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Barcelona?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Barcelona from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Barcelona?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Barcelona with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and BCN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Barcelona?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Barcelona from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from St. Louis to Barcelona-El Prat Airport

  • The airlines that serve flights from Lambert St Louis International Airport (STL) to Barcelona El Prat Airport (BCN) have varying layover destinations. Hence, your layover destination will be determined by the airline you travel with. If you travel with American Air Lines, your stopover will be in Philadelphia, and if you choose to fly with Lufthansa, you will lay over in Frankfurt. If you decide to board a two-stop Delta Air Lines flight, your layovers will be in Detroit and Paris.
  • Lambert St Louis International Airport has two passenger terminals: Terminal 1 and Terminal 2. Terminal 1 has five Concourses: A, B, C, D, and E, while Terminal 2 has only one concourse, E. On your STL flight to BCN, you are likely to depart from Terminal 1. With Lufthansa, you will depart from T1, Concourse D; with American Airlines, you depart from T1, Concourse E; and with Delta Air Lines, you will depart from T1, Concourse A.
  • Suppose you want to travel to BCN aboard a Lufthansa airline with an infant. If that is the case, your infant can travel on your lap at a heavily discounted ticket fare. For safety, flight attendants provide the baby with a safety belt before take-off. You are encouraged to reserve a bassinet for your flight 52 hours prior for proper planning. Changing tables and spare diapers are available on board.
  • If you intend to bring a drink on your STL flight to BCN, you should be aware that most airlines only allow it if the liquid is in a 3.4-oz container. The container should be carried in a plastic, transparent, and resealable bag that does not exceed one liter in size.
  • If you are a passenger with limited mobility, you don’t have to worry about struggling in STL. This is because the airport offers wheelchair services upon request, with trained staff members always ready to assist physically challenged passengers at all times. The airport also features ramps, wheelchair accessible washrooms, and accessible parking spots close to the terminals for people with reduced mobility.

Reviews of the top 5 airlines serving from St. Louis to Barcelona

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Barcelona. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Barcelona? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9066 reviews
7.7Boarding
6.6Food
8.1Crew
7.1Entertainment
7.3Comfort
Airline reviews

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

4.0 OkayJessica, Dec 2025
EWR - LAS
Read more United Airlines reviews

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Flight and crew were great. United didn't inform crew of immigration process which was disappointing!

Flight team stood out for perzonal attention, kindness at bright cheery attitudes at 8am. Very helpful.

Seats had less pitch than a regional jet. Food was OK. Have to buy alcohol on US based carriers flying international. Boarding was a mess. Did not have bags but overhead space was gone quick. Would like to see the airlines enforce the one bag over and one bag under policy

Ot was overall fine. Left on time and had basic snacks. Weather was finicky but that’s not the airlines fault.

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

It was fine. No drinks nor snacks offered though. I thought that was unusual.

I liked the humor of the captain and crew on the flight from Flagstaff to Dallas. They were humorous.

AA delayed the flight for 3 hours and 50 minutes, but delayed the last 2 hours, 30 minutes at a time, so if we knew before, could have stayed at home and worked instead of being at the airport wasting time... The plane's crew was excellent, not their fault.

After arriving in Dallas, the aircraft taxied for an unusually long time and was unable to park at the gate, which caused a significant delay and made me miss my connecting flight. I then had to wait in a very long line to be rebooked, and I was told that no hotel or meal accommodations would be provided. What is even more unacceptable is that my luggage was mishandled and has still not been located. My suitcase contains important medications that I urgently need, and I have been unable to access them due to the airline’s mishandling. This situation has caused me considerable stress and inconvenience, and I need this issue to be resolved immediately.

RIC Staff was not enough. Elderly passengers had to wait 30 minutes to deplane, so we could board and still had to walk as no chairs were provided. And, passenger in front of my seat assignment rammed seat against my legs entire flight time. Was mildly bruised and left thigh still sore.

Liked that it was on time. Staff professional and friendly.

Things were delayed a little. But that didn’t affect my plans. It was fine. I was surprised it was so full thanksgiving day. The crew were friendly and professional.

I appreciated that it was on time, safe and professional. I didn’t like that I wasn’t in a place where I had a window at my window seat. It would have been nice to know that in advance. If it was mentioned in the ticketing, I didn’t notice it.

It was just fine. I managed to make all my connection too sbut had trouble in Munich with no wheel chair and trouble trying to get help from the airport people to get to the other terminal for my flight. Finally a wonderful lady Amelia, helped me to make my flight connection Timon with zero time to spare.

Over 40 years ago my AC return flight was canceled, during this last summer the same thing happened. AC denied everything Canadian like paying for accommodations and basic necessities. So why would I ever want to fly AC again? This last flight my wife took the return flight had problems and left late, so I guess they are getting better. However I have no faith in this airline so I drove to this last destination! I'll never fly AC again!!!

Great check in process in LA and good service The check in process as well as at the gate is way better in the US versus canada 🇨🇦

Super experience. Earlier than schedule departure and arrival. Baggage handling was very good

Allow me to book extra bag check in as free though I packed in 1 luggage but that was 7 LBS overweight so make another bag to free check in.

I would like to get my money back. I flight was 4 hours late on the way to detroit, And same on my way back to Brussels they cancelled my flight and give me an other ticket and i had to wait 5 hours.

All attendents were very efficient, pleasant and happy. Everything went smoothly. The seats could have been wider. There could have been more free food instead of just one small bar.

My seat was one of those that couldn't recline, but the problem was that it was abnormally upright, so the headrest actually made the seat concave, which was uncomfortable and hard on my lower back. I had to ball my jacket up and use it as lumbar support. goodness I had it with me.

Boarding was so so after zone 3 was called all other zones went in

I liked a lot , the flight attendant so nice ,the seat very comfortable I enjoyed the flight , I will do it again with Air Canada,

It was budget airline Veuling, even though we booked Iberia.

The staff was very nice and helpful. Some of the best crew I have met.

Bad experience. The seat room are very tight. The food is not good and the breakfast has no hot drink.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

Great : The crew was awesome ♥️ To improve : - The rice in the "Rice with chicken" was rather s kind of rice pudding, not good at all - No power outlet to charge your phone. 😒

It was a good flight overall. Nothing to add. Keep it up!

Excellent. Thanks to United Star Alliance, since economy was overbooked, I’m grateful to have been upgraded to Business Class.

Good plane, excellent food, crew and entertainment. Seats in business could use an upgrade

Delayed. Mismanagement of gate lines. Passengers arguing with eachother as a result of lack of organization by airline. Avoid this airline.

Disaster. Downgraded. Zero apology. No effort or coordination between gate and crew. Awful seat blocked by door emergency slide box. Iberia is a mess. App never works. Avoid this airline.

The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.

Although business class, the seating was really cramped. The food was so so.

Smooth trip no turbulence which is always a bonus for me lol! In cattle class so an element of being a bit squished (but not as bad as other shorter haul airlines) smaller plane than the one we flew out on and entertainment system wasn’t as modern but still definitely passed the time. Lovely crew x

I was attacked in the Miami airport and the staff did nothing. On my flight from London to Miami one of the flight attendants screamed at me and demanded I keep my seat in the upright position at all times during the fight so the man behind me was comfortable for the flight. I will never in my life use British airways again

Airlines have to stop assuming passengers bring entertainment. Provide it like you used to in business class and above!! N

I don't know about the others but the flight attendant that took care of us had the absolute wrong approach "how do we dare asking for water or anything else for that matter"

Flying on the Boeing 787 from Seattle to London was everything that I expected. Every thing was great.

Not my definition of first class. No leg room and barely any recline. The food was good. The crew was great. The comfort for the price I paid for London to Cairo was highway robbery. The Wi-Fi didn't work for me either.

Seat pitch is not enough to eat comfortably. When seat in front is reclined, your screen comes closer to your face. Ryanair seats are actually more comfortable.

The leg from Portland to Heathrow was great for a business class ticket. The BA leg from Heathrow to Lisbon was terrible. Basically coach seating with an empty seat between you and next passenger. Absolutely no leg room. Should not have been charged for business class and it was a 3 hour flight.

Everything you need to know for your flight from St. Louis to Barcelona

Information on your arrival and departure airports