STL - LON

£239 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 19/5. 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, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to London, as well as popular online travel agencies
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41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest return fare
£490
Typical prices: £552-£978
United Airlines
Sun 18/1Wed 1/4
STL - LHR • 2 stops
Cheapest direct flights
£499
Finnair
Sun 26/4Wed 6/5
STL - LHR • Direct
Top airlines
Delta
Cheapest • from £492 (return)
British Airways
Best reviews • 6.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Top routes
STL-LHR
Cheapest
STL-LHR
Most popular
Insights
Insights
Insights
Insights
When to book
2 weeks
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 25% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
November
Cheapest • 21% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches hundreds of sites at once to find you the best travel deals.
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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 return 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 return flight deals from St. Louis to London

Sun, 18 Jan - Wed, 1 Apr
United Airlines Logo
11:20 - 09:20
STL
-
LHR
16h 00m2 stops
United Airlines Logo
06:30 - 13:30
LHR
-
STL
13h 00m1 stop
£490United Airlines
Sun, 26 Apr - Wed, 6 May
British Airways Logo
19:03 - 12:30
STL
-
LHR
11h 27m1 stop
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
£491British Airways
Sun, 18 Jan - Wed, 1 Apr
Delta Logo
09:59 - 06:55
STL
-
LHR
14h 56m2 stops
Delta Logo
11:45 - 23:42
LHR
-
STL
17h 57m2 stops
£492Delta
Sun, 10 May - Fri, 22 May
Multiple Airlines Logo
09:30 - 10:00
STL
-
LHR
18h 30m2 stops
Multiple Airlines Logo
06:30 - 13:30
LHR
-
STL
13h 00m1 stop
£493Multiple Airlines
Wed, 29 Apr - Tue, 5 May
Delta Logo
13:30 - 11:10
STL
-
LHR
15h 40m1 stop
Delta Logo
06:15 - 16:49
LHR
-
STL
16h 34m2 stops
£493Delta
Sun, 18 Jan - Wed, 1 Apr
Multiple Airlines Logo
16:05 - 07:10
STL
-
LHR
33h 05m2 stops
Multiple Airlines Logo
06:30 - 13:30
LHR
-
STL
13h 00m1 stop
£494Multiple Airlines
Mon, 12 Jan - Wed, 28 Jan
Multiple Airlines Logo
08:50 - 10:00
STL
-
LGW
19h 10m1 stop
Multiple Airlines Logo
13:00 - 06:51
LGW
-
STL
47h 51m2 stops
£494Multiple Airlines
Sun, 4 Jan - Thu, 15 Jan
Air Canada Logo
16:05 - 06:30
STL
-
LHR
32h 25m1 stop
Air Canada Logo
18:00 - 15:29
LHR
-
STL
27h 29m1 stop
£496Air Canada
Sun, 12 Apr - Tue, 21 Apr
Lufthansa Logo
15:30 - 18:35
STL
-
LCY
21h 05m1 stop
Lufthansa Logo
09:15 - 22:59
LCY
-
STL
19h 44m2 stops
£499Lufthansa
Tue, 31 Mar - Wed, 8 Apr
Lufthansa Logo
11:45 - 18:35
STL
-
LCY
24h 50m2 stops
Lufthansa Logo
09:15 - 22:59
LCY
-
STL
19h 44m2 stops
£502Lufthansa
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.

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 £841 on the route between St. Louis (STL) and London Heathrow Airport (LHR). It is also the most popular route.

What’s the cheapest day of the week to fly from St. Louis to London?

The average price of all round-trip flights from St. Louis to London clicked on KAYAK for each day over the last 12 months.

For St. Louis to London, Thursday is the cheapest day to fly on average and Monday is the most expensive. Flying from London back to St. Louis, the best deals are generally found on Sunday, with Thursday being the most expensive.

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 November, where tickets cost £530 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £997 and £900 respectively.

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

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 2 stops stopover the cheapest option at £581 on average.

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 2 weeks before departure, which saves you about 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Find deals

Good to know - Cheap tickets from St. Louis to London

Low seasonJanuary
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly and prices are also 12% lower on average.

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 return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns 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 airport hotels at Lambert St Louis?

    There are many hotels to choose from near Lambert St Louis. Choose a luxury stay at the Hilton Hotel, offering a pool, dining and airport shuttle service. The closest hotel to the airport is Drury Inn and Suites, only a 2min drive away.

  • What special assistance is available at Lambert St Louis?

    Wheelchair access is available at each entrance, and inside the terminal, you will find accessible restrooms, low-level ATMs for wheelchair users and elevators. There is an area for service animals, and Braille text is used on signage throughout. If you require assistance boarding the plane, we recommend contacting your airline at least 48h prior to departure to book a skycap.

  • Which London airport is closest to Central London?

    London City and London Heathrow are the most centrally-located London airports. You can get from Heathrow to the city centre on the Heathrow Express in around 20min with services running roughly every 15min. If you're travelling from London City Airport, you can take the Docklands Light Railway (DLR) from the airport station to Canning Town, where you can change to a London Underground or bus service to your final destination. The journey time should take on average around 40min - 1h.

  • What facilities are offered at St Louis Airport?

    Services available at St Louis Airport range from banking and currency exchange to luggage trolley rental. You can access Wi-Fi for free for 60min, with a small fee applicable for longer use. For anyone wishing to partake in prayer or other religious obligations, St Louis Interfaith Chapel is located on site. Shoe-shining facilities are available in each terminal, and help location points allow tourists to seek advice or assistance when navigating the airport. You can choose from several restaurants to eat at and newsagents and gift shops to browse whilst you wait for boarding to start.

  • 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 £239 for a one-way ticket and £490 for a return.

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

    St. Louis is served by only 1 airport and there are 3 airports in London. You will leave St. Louis from Lambert-St Louis and you will be arriving in London at one of these airports: London Gatwick, London Heathrow, or London Stansted.

  • 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?

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

  • 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 return 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

  • There are many transportation options to travel to St Lambert Louis Airport (STL) from St Louis. The Metrolink is an affordable choice taking around 30min to arrive at the airport. Alternatively, the bus journey is about 55min inclusive of one change, and driving by car or taxi takes about 18min.
  • If you're travelling on business, St Louis has a choice of lounges from which you can work. Wingtips Lounge is located in Terminal 2 and offers great accessibility with entry via membership and single visit passes. Enjoy a seasonal-inspired menu whilst you utilise the fast Wi-Fi and benefit from air conditioning. The lounge is available to use for a maximum of 4h.
  • Lambert St Louis has seven car parks, each within walking distance of the airport, with a free shuttle service available. Long-term parking is also available, although we recommend booking in advance to save time before your flight. Short-term parking is perfect if you're being dropped off at the airport, with both hourly and daily rates available.
  • Lambert St Louis has two terminals. Terminal 1 has four concourses from A to D, serving domestic flights. Flights from Lambert St Louis to London will depart from Terminal 2, which caters for all international flights and is located on the southern end of the complex. You can fly to one of three London airports: Heathrow (LHR), Gatwick (LGW) and London City (LCY).
  • If you're travelling with the family, make the most of Lambert St Louis' Play Port – a transport-themed play exhibit. The exhibit offers both fun and education with features such as a child-size plane and air control tower. Baby-changing facilities are available throughout the airport, along with lactation suites for breastfeeding mothers.

Reviews of the top airline flying 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.
6.7
British AirwaysOverall score based on 7580 reviews
6.7Comfort
7.6Crew
6.9Boarding
6.4Food
6.4Entertainment
Airline reviews

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

8.0 ExcellentAnonymous, Dec 2025
SFO - LHR
Read more British Airways reviews

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

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

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

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.

The flat beds. Other than that, the place was not clean.

Moved me away from my family and refused to fix it.

I have always been pleased with their service. Would not change a thing

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

Information on your arrival and departure airports

St. Louis (STL)