STL - BCN

$241 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 4/21. 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
$422
Typical prices: $723-$1,151
British Airways
Wed 3/4Wed 4/8
STL - BCN • 2 stops
Cheapest one-way
$241
Typical prices: $645-$711
British Airways
Tue 4/21
STL - BCN • 2 stops
Top airlines
British Airways
Cheapest • from $422 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 48% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 41% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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

Wed, Mar 4 - Wed, Apr 8
British Airways Logo
2:00 pm - 11:10 am
STL
-
BCN
14h 10m
2 stops
British Airways Logo
12:50 pm - 7:27 pm
BCN
-
STL
13h 37m
1 stop
$422British Airways
Mon, Apr 13 - Mon, Apr 27
British Airways Logo
2:29 pm - 4:25 pm
STL
-
BCN
18h 56m
2 stops
British Airways Logo
8:35 pm - 7:30 pm
BCN
-
STL
29h 55m
1 stop
$429British Airways
Mon, Apr 13 - Mon, Apr 27
British Airways Logo
7:05 am - 12:05 pm
STL
-
BCN
22h 00m
2 stops
British Airways Logo
9:20 pm - 7:30 pm
BCN
-
STL
29h 10m
2 stops
$432British Airways
Wed, Mar 4 - Wed, Apr 8
Multiple Airlines Logo
11:22 am - 1:05 pm
STL
-
BCN
18h 43m
1 stop
Multiple Airlines Logo
6:30 pm - 10:53 am
BCN
-
STL
23h 23m
1 stop
$435Multiple Airlines
Mon, Apr 13 - Mon, Apr 27
British Airways Logo
6:00 am - 10:35 am
STL
-
BCN
21h 35m
1 stop
British Airways Logo
6:00 pm - 7:30 pm
BCN
-
STL
32h 30m
1 stop
$438British Airways
Mon, Apr 13 - Mon, Apr 27
British Airways Logo
7:05 am - 10:35 am
STL
-
BCN
20h 30m
1 stop
British Airways Logo
9:20 pm - 7:30 pm
BCN
-
STL
29h 10m
1 stop
$441British Airways
Wed, Feb 18 - Sun, Feb 22
Multiple Airlines Logo
11:46 am - 8:50 am
STL
-
BCN
14h 04m
1 stop
Multiple Airlines Logo
3:05 pm - 10:32 am
BCN
-
STL
26h 27m
1 stop
$465Multiple Airlines
Tue, Apr 14 - Sat, Apr 25
British Airways Logo
12:11 pm - 1:15 pm
STL
-
BCN
18h 04m
2 stops
British Airways Logo
7:20 pm - 7:30 pm
BCN
-
STL
31h 10m
1 stop
$479British Airways
Tue, Apr 14 - Sat, Apr 25
British Airways Logo
11:44 am - 1:15 pm
STL
-
BCN
18h 31m
2 stops
British Airways Logo
9:15 pm - 4:16 pm
BCN
-
STL
26h 01m
2 stops
$482British Airways
Sun, Feb 1 - Tue, Feb 17
British Airways Logo
2:54 pm - 9:05 am
STL
-
BCN
35h 11m
2 stops
British Airways Logo
11:20 am - 11:48 pm
BCN
-
STL
19h 28m
2 stops
$483British Airways
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 March.

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 January, where tickets cost $505 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,253 and $1,150 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 4 weeks before departure, which saves you about 48% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$241
Best time to beat the crowds with an average 42% drop in price.
Most popular time to fly and prices are also 1% 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 $241 for a one-way ticket and $422 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 9191 reviews
7.1Entertainment
7.3Comfort
7.7Boarding
6.6Food
8.1Crew
Airline reviews

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

4.0 OkayAnonymous, Jan 2026
ALB - IAD
Read more United Airlines reviews

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

The flight crew where really good. Better then the crew from BNE to SFO

Food should be changed in menu Many muslims travels in this airlime they need to add one Halal meal

Delayed, toilets did not flush, pilot parked to far away from Gate

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Ineffective communication with United resulted in lost baggage. Their Baggage Tracing counter at MUC was shut down from 11:00-14:15 on my arrival. Undertrained, underinformed staff had me Running all over MUC to find someone to help me to no avail. Staff was rude, unhelpful, and unable to effectively use the systems they did have operational. They refused to contact United in any way or provide any accommodation or other resources while I waited for my luggage. This has destroyed my downstream itinerary. If they had even the slightest visibility I may have been able to reschedule/plan, but again, their staff provided nothing, and did nothing more than their website, which doesn’t even work on a standard phone browser. Miserable failure at all levels that weren’t associated with the operation of the aircraft.

Miserable. They moved my seat, but canceled the next leg of my flight. I resolved the issue at my transfer, but that resulted in lost luggage that has taken days off my schedule with no resolution. Worse, they fail to interface effectively with Lufthansa, forcing me to bounce between two equally useless help desks. The apps are unable to handle the situation, the bag dropped off the tracker, and while the call centers are polite, they do not provide written information to assist with cross-airline communication.

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Long delays, lack of information about the status of the flight. The flight was delayed 4 times.

Could we please end the loud announcements about credit card offers on your flights? We are trying to sleep, work, watch videos, etc. and if we need a credit card, we will ask for one. Flying is already not what it used to be.

I would like the crew to talk LESS over the PA and specifically about credit card offers. I am trying to work, sleep, watch a movie and the PA was booming about a credit card offer. Could we go back to the days when the customer was more important than selling a credit card?

Enough space,crew was helpful,food was good.The gates are way far especially for travelers with health issues

No enough space plus only allowing one laggage instead of two like other airlines.

There were no TV screens - even in Business class. 5 delays, and only given $12 meal voucher! Terrible!

It was good. But the gate team made me check my carry on when there was plenty of space for my luggage on the plane. Otherwise our trip was fine.

The entertainment options were at best, fair. It was exactly the same as my outbound flight. It would have been more entertaining if there were some series from Apple TV, HBO, Showtime or other carriers for me to catch up with.

Concern Regarding Significant Gate Delay and Jet Bridge Issue Dear Customer Relations Team, I am writing to express my disappointment with the experience I had on my recent flight AA 2414 on Sunday January 18, 2026. What should have been a routine departure turned into a frustrating and avoidable delay due to an issue with the jet bridge at the gate. As a result, the flight was delayed by approximately 90 minutes while multiple gate changes were attempted. The lack of clear communication during this period made the situation even more challenging. Passengers were left uncertain about the cause of the delay, the expected timeline, and the next steps. This not only disrupted travel plans but also created unnecessary stress for everyone on board. I understand that operational issues can arise, but a malfunctioning jet bridge and the resulting extended delay suggest an area where procedures or equipment maintenance may need attention. I hope you will review this incident to prevent similar disruptions in the future. I would appreciate acknowledgment of this concern and consideration of appropriate compensation for the inconvenience and lost time caused by this delay. Thank you for taking the time to review my experience. I look forward to hearing from you. Sincerely, Dion Dillard

I waiting for 2 hrs to retrieve my luggage. Didn't get home till 3am.

The flight left late and I didn’t get a glass of bubbly upon boarding (which I’m used to when booking business class on other flights), but otherwise it was a pleasant flight with lovely, helpful crew members and I enjoyed my meal.

Flight cancellations, delays, mass confusion and disorganization! That’s Air Canada for you, nothing new. I would have chosen a different airline if it were an option, and Air Canada continues to prove they don’t care about their customers.

everything was fine. but paying for 1 piece of check-in luggage and denying passengers to board with carry-on luggage which by air line's standards does not fit is not acceptable. when one travels for a longer time one needs to have some essentials

Couldn't fit knees, only 1 toilet working, didn't get anything to drink cause the stewards were not able to get to us

Flight was canceled for a reason they knew hours before but did not mention. Next the gate chnage from 37 to 38 at least 10 times. Ridiculous.

The flight from SFO to YVR was delayed and my bag did not make it to my next flight from YVR to SYD. It took almost 3 days after I landed to get my bag and when I got it, it was filled with dust

Our biggest complaint about Air Canada is that if you don’t like your seat during check-in, there’s a fee to move elsewhere. On our flight from YUL to FFL, we were charged to change seats—just regular seats. What’s maddening is that the plane wasn’t even full; there were even a few people sleeping in the middle row sections (entire rows, completely empty), using them as beds. In my opinion, charging passengers for seat changes is a cash grab by Air Canada. They are definitely not the airline they were back in the day. I suppose they need to gouge the consumer now that they pay their attendants while on ground. One out of 10.

Nothing specific. Cabin temperature was too high for some reason.

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.

Bad weather Excelent pilot Spoke British 😆on time seats small ad expected in a discount airline

It wasn’t great because the third-party from Kayak there was just no information about how to check in with Vueling. And the purchase of the ticket from under pricer just made everything really difficult. I’m unlikely to use Kayak again for these reasons.

It was fine, older plane with limited entertainment, otherwise fine.

the seats were bad and uncomfortable and the food was not tasty.

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

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

The issue was not with BA it was with the link yoiu sent fopr booking the flight

Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices

Late. And service was very slow - passengers sat for well over an hour with dirty trays etc surrounding them

Getting the boarding passes between the BA and AA apps was very clunky.

The airline was not clear about a new departure time so we got to the airport early anyway. The flight left early which was great because of weather. The check in process was very easy and staff were friendly and helpful. The crew was great and our flight was very good.

The plane was dirty the food was awful and the boarding process took too long

Awful it always is unfortunately is the only way to fly direct to london

I travelled in business class and was disappointed by lack of service, curt and borderline rude time of the crew and to top it off, all of my luggage was delayed. It was like pulling teeth to even report the missing luggage and recover it the next day from the airport.

Plane was extremely delayed, but not all of it was BA fault (some was). Worst part was lack of room - this had as much space as an Allegiant flight. I thought transatlantic usually gave you an extra inch or two, but not this one. Entertainment system sporadically worked and didn’t have great options. Overhead bins are old and tiny, not as good as aunties new planes.

Boarding was poor. All groups called immediately one after the other resulting in a long queue in the jetty/jet bridge. Seats were very hard and and did not recline on a 4.5 hour flight. No food was available. Plane was cold. There was no entertainment.

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

Information on your arrival and departure airports