STL - LON

$325 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 8/4. 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
$799
Multiple Airlines
Mon 5/4Fri 5/8
STL - LGW • 2 stops
Cheapest non-stop
$895
British Airways
Tue 5/5Tue 5/19
STL - LHR • Non-stop
Nonstop flights
4 days a week
Tue, Wed, Fri, Sun
You can fly direct with British Airways. Average duration is 8h 00m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top airlines
Cheapest • from $822 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
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
+1
+1
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

Mon, May 4 - Fri, May 8
Multiple Airlines Logo
8:23 pm - 6:20 am
STL
-
LGW
27h 57m
2 stops
Multiple Airlines Logo
2:00 pm - 12:21 am
LGW
-
STL
16h 21m
1 stop
$799Multiple Airlines
Mon, Apr 27 - Fri, May 8
Multiple Airlines Logo
4:59 pm - 6:20 am
STL
-
LGW
31h 21m
2 stops
Multiple Airlines Logo
2:00 pm - 12:21 am
LGW
-
STL
16h 21m
1 stop
$804Multiple Airlines
Sun, Sep 6 - Sat, Sep 12
Scandinavian Airlines Logo
1:30 pm - 9:40 pm
STL
-
LHR
26h 10m
2 stops
Scandinavian Airlines Logo
6:40 am - 11:37 pm
LHR
-
STL
22h 57m
2 stops
$822Scandinavian Airlines
Sun, Sep 6 - Sat, Sep 12
Scandinavian Airlines Logo
3:42 pm - 5:40 pm
STL
-
LHR
19h 58m
2 stops
Scandinavian Airlines Logo
6:40 am - 8:50 pm
LHR
-
STL
20h 10m
2 stops
$823Scandinavian Airlines
Sun, May 10 - Tue, May 19
Virgin Atlantic Logo
5:36 pm - 1:05 pm
STL
-
LHR
13h 29m
1 stop
Virgin Atlantic Logo
8:40 am - 11:21 pm
LHR
-
STL
20h 41m
2 stops
$830Virgin Atlantic
Wed, Aug 19 - Fri, Aug 28
Lufthansa Logo
3:30 pm - 5:55 pm
STL
-
LCY
20h 25m
1 stop
Lufthansa Logo
9:15 am - 11:00 pm
LCY
-
STL
19h 45m
2 stops
$905Lufthansa
Wed, Aug 19 - Fri, Aug 28
Lufthansa Logo
6:55 pm - 5:55 pm
STL
-
LCY
17h 00m
2 stops
Lufthansa Logo
9:15 am - 11:00 pm
LCY
-
STL
19h 45m
2 stops
$909Lufthansa
Fri, May 8 - Fri, May 22
Delta Logo
1:59 pm - 9:30 am
STL
-
LCY
13h 31m
2 stops
Delta Logo
9:20 am - 9:09 pm
LCY
-
STL
17h 49m
2 stops
$953Delta
Thu, Aug 20 - Mon, Jan 18
Delta Logo
1:30 pm - 8:50 am
STL
-
LCY
13h 20m
2 stops
Delta Logo
7:45 am - 8:37 pm
LCY
-
STL
18h 52m
2 stops
$1,001Delta
Tue, Sep 29 - Mon, Oct 12
British Airways Logo
12:47 pm - 9:10 am
STL
-
LCY
38h 23m
2 stops
British Airways Logo
8:25 pm - 11:41 pm
LCY
-
STL
33h 16m
2 stops
$1,026British Airways
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 May.

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 $796 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 $1,333 and $1,129 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 8 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$325
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 Heathrow 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.

  • 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 $325 for a one-way ticket and $799 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 $963 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 $488 or less one-way and $963 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 8406 reviews
8.1Boarding
7.2Food
7.9Comfort
7.8Entertainment
8.5Crew
Airline reviews

One of the flight attendants was a little cranky. I appreciated the free wifi and plug to charge my laptop

8.0 ExcellentBarbie, Apr 2026
BOS - SFO
Read more Delta reviews

One of the flight attendants was a little cranky. I appreciated the free wifi and plug to charge my laptop

No entertainment. Plane was so small had to pink tag a carry on ive used for 20 years easily on board. The fact the flight got in at midnight, had to wait for crew in fort wayne to allow the plane to approach the gate, THEN had to wait for bag on jet bridge made experience irritating at best.

Crew was great. Near on time departure and early arrival. Snacks are always meh. Not a fan of the "pay for everything including miles " proposal unless base flight rate going to be 100 bucks.

Would have been better if there was a nonstop flight from Tampa to Norfolk or Tampa to New Port News.

Overall Good! The weather delayed our takeoff from Atlanta and our arrival in Miami! If Mother Nature can mess up a flight she will do it every time!

The flight was smooth, the crew was great but the plane was quite old

Everything was great until I lost my water bottle and they can’t seem to locate it. I know I left it on the plane though.

WiFi didn’t work most of the time. The usb chargers would work only occasionally for 5 mins and wouldn’t charge after that. Had to keep trying repeatedly at each of the seats in the row.

The crew bent over backwards to thank us for flying and make us comfortable. The food service was quick and efficient. The Captain communicated and said goodbye and thank you as we departed. They really stood out!

Okay considering we had weather delays which the Pilot notified us of immediately!

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

Overall flight was ok. Flight attendant was receptive to assisting passengers with tight connections.

Checking in united could not figure out my star alliance gold. Baggage did not get marked priority and didn't receive boarding passes. When got to SFO lounge personal fixed everything Immediately

Very comfortable flight, snacks and drinks were good, good communication from crew. Could have used a little more information on timing of boarding for group 5

It's a long flight and I would have liked better snacks between lunch and the arrival meal. It's fine to have fruit and nuts but I really don't like ramen because it's salty junk soup. I'd suggest sandwiches. They're not expensive nor are they hard to store for a long flight. The FA's had a couple of big services and they were super busy preparing, executing and then cleaning up. Then they disappeared.

Great flight. Got to watch a movie. Smooth flight and early arrival at ORD.

This was the first flight in the morning. We boarded fine. The cabin door was closed and we were ready to go. We were notified by the Captain that ATC issued and ground stop for 40 minutes. So, without even pushing back from the gate, we were already 40 minutes late. We actually were released to push-back and taxi at 30 minutes. But, some passengers had tight connections and were not going to make their connections. Some passengers asked about the delay and the effect on the connections and were told by the cabin attendant that all flights will be delayed and so they should be OK. However, that was not true. My connecting flight was on time and I arrived at IAH with 21 minutes to make my connection. I did and I'm happy about that, but the flight crew should not have given assurances to the passengers who might have missed their connections.

Poor communication, flight was delayed for preventable reasons. I missed my connection.

It was better than excellent. The staff in Mason City were great. The young woman that pushed my wheelchair did more than could be expected of her. She came from India 17 years ago. I don't remember her name.

We did not have enough time to make our connecting flight. As a result, we were put onto a different airline for our second leg. The different airline was NOT comparable to British Airlines, and our arrival was significantly delayed. The actual flight on BA was amazing.

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.

It was a problem because there was a delay where we sat before taking off from newark,then when landed in Toronto we sat on tarmac and they wouldn't let us out for a long period of time. When we finally were released to the airport in Toronto the attendant scanned our boarding pass that we were here for our connection to Brazil. We ran all the way to the gate and they said at the gate the door is shut so we can not let you on the plane. We explained that we were checked in by the attendant when we arrived at Toronto airport to go to Brazil and they should not have shut the door. We were ignored at the gate

Flight home was delayed multiple times, did not get home until 2am

the check-in lady at ORD was extremely rude and unprofessional. very disappointed as it was supposed to be a celebration for my wife's birthday and it really put a damper on things. if i wanted to be treated like trash, i would have flown Economy! (as opposed to business class)

My original flight was cancelled and then rebooked four hours later on a recovery flight, but I was checked in as stanby and had no seats so as a family of four we were concerned about not being seated altogether. Our flight then got delayed by another 1.5 hours and when seats were assigned at the gate, three of the four of us were together and we could get my wife closer, they offered no assistance.

I bought a ticket from Kayak. When I got to the airport, the was no ticket. I had to pay 5X to get to my destination. No response received from Kayak. I will NEVER use them again.

My wallet was stolen while I was sleeping on the plane.

Good boarding but extremely cold temperature in both flights (60 F!).

The whole plane smelled and felt old. The seats were very uncomfortable. Multiple delays. Extra fees.

It was great to have a vegetarian meal option, but departure was delayed because they had oversold the flight. Air Canada, you’re in charge of how many tickets are sold: don’t oversell!

Very rude gate attendants in San Francisco who didn’t let me bring my little carry on (smaller than usual size) and after boarding I realized that there still were a lot of overhead compartment space (like a full section available in some spots). That made me lose 30 minutes at my destination at 1am and it could have broken something fragile that I had in it

I’ve never been on a trans-Atlantic (or Pacific) flight where the seats don’t recline—not even a little. I asked my seat mate when BA starting doing this and he said “Oh, a few years ago.” I couldn’t sleep, with my head falling forward waking me continuously, and came off the plane incredibly stiff. I booked a Premium Economy seat to get a more comfortable seat, which was worse than most basic Economy seats I’ve ever booked.

Nice aircraft. Good crew. Delayed departure from Houston, but arrived on time in London. Main thing I don’t like about flying BA is having to transit through security in London Heathrow. A major pain!

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

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

Information on your arrival and departure airports