STL - LON

$360 Find Cheap Flights from St. Louis to London

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 London departing on 8/1. 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 London

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

Cheapest round-trip
$733
Typical prices: $980-$728
Iberia
Tue 4/21Wed 5/13
STL - LHR • 1 stop
Cheapest non-stop
$873
British Airways
Tue 9/22Tue 10/6
STL - LHR • Non-stop
Nonstop flights
Tue, Wed, Fri, Sun
You can fly direct with British Airways. Average duration is 8h 00m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top airlines
Cheapest • from $733 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Top layover airports
Cheapest • Avg $632 (round-trip)
Shortest trip • 10h 30m (one-way)
Insights
Insights
Insights
Insights
Top routes
Cheapest
Most popular
Insights
Insights
Insights
Insights
When to travel
Cheapest • 21% price drop
Most popular
Good to know
Good to know
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Good to know
Good to know
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to London (STL-LON)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to London 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 London

Tue, Apr 21 - Wed, May 13
Iberia Logo
6:11 pm - 12:10 pm
STL
-
LHR
11h 59m
1 stop
Iberia Logo
6:15 am - 10:19 pm
LHR
-
STL
22h 04m
2 stops
$733Iberia
Wed, Apr 15 - Fri, Apr 24
Multiple Airlines Logo
8:23 pm - 6:20 am
STL
-
LGW
27h 57m
2 stops
Multiple Airlines Logo
2:00 pm - 11:19 pm
LGW
-
STL
15h 19m
1 stop
$740Multiple Airlines
Tue, Apr 21 - Wed, May 13
Iberia Logo
6:11 pm - 5:15 pm
STL
-
LHR
17h 04m
2 stops
Iberia Logo
6:15 am - 10:19 pm
LHR
-
STL
22h 04m
2 stops
$741Iberia
Tue, Apr 21 - Wed, May 13
Air Canada Logo
4:05 pm - 8:35 am
STL
-
LHR
10h 30m
1 stop
Air Canada Logo
2:05 pm - 8:25 pm
LHR
-
STL
12h 20m
1 stop
$763Air Canada
Wed, Sep 2 - Fri, Sep 11
Lufthansa Logo
3:30 pm - 4:40 pm
STL
-
LHR
19h 10m
1 stop
Lufthansa Logo
6:30 am - 1:25 pm
LHR
-
STL
12h 55m
1 stop
$792Lufthansa
Tue, May 5 - Tue, May 19
Lufthansa Logo
7:09 pm - 8:40 pm
STL
-
LHR
19h 31m
2 stops
Lufthansa Logo
9:00 am - 9:13 pm
LHR
-
STL
18h 13m
2 stops
$796Lufthansa
Mon, May 4 - Mon, May 11
British Airways Logo
1:29 pm - 3:15 pm
STL
-
LCY
19h 46m
2 stops
British Airways Logo
7:15 pm - 7:30 pm
LCY
-
STL
30h 15m
2 stops
$903British Airways
Wed, Apr 22 - Mon, Apr 27
British Airways Logo
8:03 pm - 9:10 am
STL
-
LCY
31h 07m
2 stops
British Airways Logo
7:15 pm - 5:03 pm
LCY
-
STL
27h 48m
2 stops
$949British Airways
Mon, Aug 17 - Mon, Aug 24
Delta Logo
2:18 pm - 9:30 am
STL
-
LCY
13h 12m
2 stops
Delta Logo
7:45 am - 8:31 pm
LCY
-
STL
18h 46m
2 stops
$952Delta
Mon, Aug 24 - Mon, Sep 7
Delta Logo
2:18 pm - 9:30 am
STL
-
LCY
13h 12m
2 stops
Delta Logo
9:20 am - 8:50 pm
LCY
-
STL
17h 30m
2 stops
$958Delta
Booking Insights

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

Get data-powered insights and trends into flights from St. Louis to London 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 London?

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 London departing in April.

What is the cheapest St. Louis to London flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from St. Louis to London costs $678 on the route between St. Louis (STL) and London Heathrow Airport (LHR). It is also the most popular route.

What is the cheapest month to fly from St. Louis to London?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to London, 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 London is January, where tickets cost $672 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $1,326 and $1,136 respectively.

Can I save money by flying with a layover from St. Louis to London?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $763, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from St. Louis to London?

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 London, 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 London, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$360
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly with an average 16% increase in price.
Flight from St. Louis to London Gatwick Airport

When to book flights from St. Louis to London

Are your dates flexible? Find out the best times to travel from St. Louis to London 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 flights from St. Louis to London

  • Are there hotels near London airports?

    There are a lot of hotels at and surrounding Heathrow Airport, and they provide rooms at prices to suit a wide range of budgets. The Yotel is a hotel with a pod-like design that is located inside Terminal 4 and is styled like the first-class cabin of an airplane. You may book rooms on an hourly basis, which is an excellent choice if you have a stopover and need to get some sleep before continuing on your journey.

  • What is the most reliable way to get to the city center from the Heathrow Airport London (LHR)?

    The most reliable way to get into s the town center is to take either the Tube's Piccadilly Line or the Heathrow Express train. This option is best if you only have to wait for less than 6h, but it is a lot more expensive than the Tube.

  • Are there banking services available at Lambert-St Louis Airport (STL)?

    A full-service US Bank offers comprehensive banking and foreign exchange services. It is situated in Terminal 1, Lower Level, across from Great American Bagel.

  • Does Lambert-St Louis Airport (STL) have lactating rooms for mothers?

    St. Louis Lambert International Airport (STL) has a private, designated place for nursing mothers. The room is situated after security checkpoints on all three concourses, close to Gates A10, C9, and E33.

  • How many flights are there between St. Louis and London per day?

    There is a maximum of 1 nonstop flight a day that takes off from St. Louis and lands in London, with an average flight time of 8h 00m. The most common departure time is 9:00 pm and most flights take off in the evening. Each week, there are 4 flights.

  • What is the cheapest flight from St. Louis to London?

    In the last 3 days, the lowest price for a flight from St. Louis to London was $360 for a one-way ticket and $733 for a round-trip.

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

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

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

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at one of these airports: London Gatwick, London Heathrow, or London Stansted.

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to London?

    American Airlines, Lufthansa, and United Airlines offer inflight Wi-Fi service on the St. Louis to London flight route.

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

    The Boeing 787-8 Dreamliner is the aircraft model that flies most regularly on the St. Louis to London flight route.

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

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

  • On which days can I fly direct from St. Louis to London?

    You can catch a nonstop flight from St. Louis to London on on Tuesday, Wednesday, Friday, and Sunday.

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

    The two airlines most popular with KAYAK users for flights from St. Louis to London are Delta and KLM. With an average price for the route of $949 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 $728 and an overall rating of 7.8.

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

    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 London.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London 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 London?

    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 London with an airline and back to St. Louis with another airline.

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

    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 London 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 London

  • Looking for a cheap flight? 25% of our users found flights on this route for $538 or less one-way and $884 or less round-trip.
  • If you want to travel to London from Lamber St Louis, there are three main airports you can use for your arrivals, London Heathrow Airport (LHR), Gatwick Airport (LGW), and London City Airport (LCY). London Heathrow airport is the main international airport connecting cities and nearby countries.
  • There is a lounge that you may access by either making a payment at the door or enrolling in a lounge membership program, and this is regardless of the class of service that you are flying at Lambert-St Louis (STL). There is also a facility called the USO that provides active members of the United States military and their families with access to a lounge that is free of charge.
  • You may take your children to the play area for youngsters if you want to make sure that they use up all of their excess energy before taking off on their flight. An exhibit with a focus on transportation may be seen at the St. Louis International Play Port, which can be found in the STL airport near Gate C3.
  • If you have any inquiries while at St Louis Airport, you can go to one of the information desks located around the airport for help. Passengers in Terminal 2 have many options for getting in touch with the Information Booth. You may use the courtesy phones that are situated at Gate E10 or in the baggage claim area just across from the Southwest Airlines Baggage Office.
  • Heathrow Airport (LHR) does not provide complimentary wireless Internet access. Instead, it offers Boingo, a pay-as-you-go Wi-Fi service. There are additional PCs with wired Internet connections available at each terminal, however, they are also for a fee. However, if you pay to enter an executive lounge such as o1 Lounges, Plaza Premium, and Club Aspire, you will enjoy free internet access. London City Airport and Gatwick Airport on the other hand offer complimentary Wi-Fi connection and each lounge has a shower.
  • If you need assistance with your bags, there are baggage carts available for a fee at the departures area of Terminal 1 and in the baggage claim sections of Terminals 1 and 2 respectively at STL Airport.

Prefer to fly direct from St. Louis to London?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Lambert-St Louis to London.
Find which airlines fly direct from Lambert-St Louis Airport to London, which days they fly and book direct flights.

Direct departures

Lambert-St Louis to London

Tuesday

British Airways

British Airways

Wednesday

British Airways

British Airways

Friday

British Airways

British Airways

Sunday

British Airways

British Airways

See more direct flights

Direct returns

London to Lambert-St Louis

Tuesday

British Airways

British Airways

Wednesday

British Airways

British Airways

Friday

British Airways

British Airways

Sunday

British Airways

British Airways

See more direct flights

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

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to London. 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 London? 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.
7.9
DeltaOverall score based on 8359 reviews
7.9Comfort
7.8Entertainment
8.5Crew
7.2Food
8.1Boarding
Airline reviews

Arlene was a great flight attendant. I also liked how one of the other flight attendants gave us a heads up about snacks and asked everyone to remove their headphones when it was their turn to order. Good idea.

10.0 ExcellentAnonymous, Mar 2026
SAT - LAX
Read more Delta reviews

Arlene was a great flight attendant. I also liked how one of the other flight attendants gave us a heads up about snacks and asked everyone to remove their headphones when it was their turn to order. Good idea.

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

I haven’t flown economy in over 20 years but it was not bad. Room by my feet for my bag and seat was roomy enough. Surprised in a good way.

The flight was delayed 90 minutes The Gate was wrong The Restroom on Aircraft was not clean There was a half used water bottle in my seat

Delta is always a wonderful experience. A clean plane and the crew is really friendly.

Too many people are taking up space in the overhead bins with their extra piece of luggage. Since they cannot fit their backpacks or extra luggage piece under the seat in front of them, they store it in the overheads and thus taking up room for other passengers. It wasn’t only one or two persons; more like 12 or 13 passengers.

Excellent service, I love the soft blush pink mood lighting on the 767-400ER during meal service. The overhead gasper vents on the 767-400ER were also very strong with a lot of airflow to keep me comfortable on my flight.

This was the worse experience. They delayed our flight twice and we still had to find another flight to get home sooner which was alos delayed. Also, the flight attendant named Ginny on DL9890 leaving at 4:13pm on 3/23/26 was extremely rude.

I love Delta the flight attendants were personable and the flight arrived 1/2 earlier thanks expected. All a plus. The gate agent was a bit flustered but even with that I still had a good experience. Her supervisor assisted me.

The return flight was great. The flight out to CDG was overbooked, and we were forced to check in a small carry-on at the get immediately before the flight, before getting out the stuff we needed on the plane.

No meal service to the back of the plane as it started late or was too slow to get it out before it was time to land.

Terrible, if possible won't be flying again anytime soon!

Efficient boarding and early departure. Very smooth flight. Early arrival in ATL. Great flight.

We purchase first class seats for the first time for multiples of standard economy ticket. There was no access to the club lounge and no priority boarding. The meal and the service once on the plane were superior and the seat was nicer, but not worth the price difference. I will be happy to seat in economy and spend the difference on more travel.

The business class seat is exceptional. I wish the food is more palatable.

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

the entire flight felt off. The crew seemed uninterested and disengaged. The food service was really bad - overcooked, bland, weird food service. They actually woke us up to serve chicken wraps in the middle of the night, after dinner and before breakfast. Made no sense. Ultimately, I was glad they did though, because the breakfast had been held for so long it was inedible. Eggs, potatoes, sausage - all disgusting. We were asked to "honor" the lavatories for premium customers and stay in our own cabin: this was also strange. So people in economy didn't pay enough to use the closest toilet to them??? It's a toilet. All in all, not the experience I have come to expect from United Airlines. The return flight from Paris to SFO was better, btw.

Smooth and easy boarding, comfortable for the entire 5 hour flight, and the seat back entertainment was great! I appreciated all the features, from location info and maps, movies, the ability to connect with Bluetooth headphones, and good selection of movies. Food was good, normal airline snacks (I didn’t purchase anything)

Overall, the flight was good. Lounge access should be with all business class tickets.

They promise free wi-fi prior to boarding and then once on board you are informed you have to purchase wifi even after being a mileagePlus member.

Tv screens and movie selection v good. Friendly staff. They were really worried about max capacity and room for carryons. That is never fun but i had no problem finding space when I boarded.

Good crew and flight was on time. It’s a small plane with limited overhead luggage space. They said the overhead space was full and I had to check my bag. There was still space when I got on. Waiting for my checked luggage added 30 minutes to my trip. Not the end of the world but also not great.

My flight to London from Philadelphia was cancelled due to weather.

Trip delayed for 2 hours because of rain. We boarded and have to get down the flight and reboard again.

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

Qatar airways ,boarding arrangements at Hamid international airport could been better

Disliked having to wait a little longer to disembark from the plan when we landed in London

Food should be better quality. Video screens have poor resolution and the library of movies is poor. The other airlines are much better.

The trip was smooth but the crew were very abrupt, snatching things before finished and being quite snappy when asked questions.

My wife and I love to travel, so we fly a lot. We've already logged 381,075 miles and with practically every major airline. But this flight was very disappointing. It started off well, with no delays and a new plane. But when lunchtime approached, all that good impression was ruined. Instead of white tablecloths, we were offered small, dark placemats, which, as it turned out, were perfectly adequate for the food. All the food offered—and my wife and I only took fish, and the meat—was not just bad, it was downright disgusting and not heated enough. The same applies to the appetizers. This was the first time in many years of traveling that we've been offered such disgusting food.

Flight was fine - however my husband's checked in case was damaged, and mine still has not arrived

Awful. They didn't even show concern that her connecting flight( Dallas to Mardrid) was gone/missing. I don't understand how that is even possible. Rudest answer from one of the crew was that American Airlines sold the tickets to somebody else. My daughter was not in the list.

The flight was canceled on a Thursday last minute. I lost thousands of dollars in hotels and car rental

Excellent lie flat seat for premium economy! Great staff. Bad food . Not so great entertainment. My bag didn’t make it either.

Really like the idea experience on this airline I will use again

The boarding procedure got confusing because they wanted to weigh everyone’s carry-on. Apparently mine was 3 1/2 kg over their limit. I didn’t know they had a limit. And at the check-in desk, nothing was said about this. They wanted me to check the carry-on at no charge and that would have been fine except then they told me at my connection in London I would have to go outside to baggage claim retrieve my bag, and then recheck it. In other words, they could not check it to my final destination, only to London. I told him this was unacceptable so after a few minutes of discussion, they came back and said that my bag would be OK to carry on the plane. It seems that if you have a connection then the weight is not as important. Then when I actually went to board the boarding agent said I needed a tag indicating that my bag had been weighed, even though she had just five minutes ago talked to the same person who cleared me. Lots of confusion seems like a very bad process. They need to improve this.

My flight being automatically moved messed up my travel plans, and I had to quickly find an alternative mode of transportation. I couldn’t get a refund from any of the companies involved. Kayak, Ibiza, or Vueling. I am still unsure of how to settle my concern.

Plane delayed due to weather. Plane boarded, then told to unboard due to a maintenance issue.

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.

The gate agent made me check my carry-on in Denver, even though I've traveled all over taking this case on the plane. Beware folks. Food in Premium Economy was quite good - excellent blanket! Flight attendants on the Heathrow-to-Budapest flight on 3-27-2026 were quite snappy. I got a frown when asked to unscrew the water bottle cap for me (I had a cast on my right arm). Also woke up right when they were handing out biscuits. She had given my rowmates one and was in the process of giving water when I asked for a biscuit. She scolded me and said, "You snooze, you lose". She did give me one, but I thought that comment was uncalled for.

Wish the food and overall service was better. They treat Business class passengers same as economy

WiFi wasn’t available to economy until the end of the flight.

Very good staff members with sincere passion and responsibility in their job.

Very please with the seating that the Kayak staff booked for us!

Worth every penny to upgrade to BC. Treated and felt more like First Class

Good service, food and comfort in World Traveller Plus. Entertainment was poor - no wifi on the way out and barely working on the way back. Not a great choice of entertainment on the seat back tv.

They had us seating down for one hour just waiting on the plane

Flying with BA is always a good experience—even in economy class. It is better if in business and first class. Timely, breeze through security and timely connections

We waited at BOS at the gate for an hour and couldn’t get a drink or anything. Once in the air the service, food and ride was excellent.

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

Information on your arrival and departure airports