£239 Cheap Flights from St. Louis (STL) to London (LHR)

View £239 flight on Tue, 22 Sept 2026Opens in a new window

Popular airlines from Lambert-St. Louis International Airport (STL) to Heathrow Airport (LHR)

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Cheap Flights from St. Louis (STL) to London (LHR)

Prices were available within the past 7 days and start at £239 for one-way flights and £632 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Iberia
Sun, 4 Oct - Tue, 13 Oct
STL
St. Louis
LHR
London
£632 Return, found 5 days ago
£632
Return
found 5 days ago
Select Iberia flight, departing Sun, 4 Oct from St. Louis to London, returning Tue, 13 Oct, priced at £632 found 5 days ago
KLM
Tue, 29 Sept - Mon, 5 Oct
STL
St. Louis
LHR
London
£633 Return, found 12 hours ago
£633
Return
found 12 hours ago
Select KLM flight, departing Tue, 29 Sept from St. Louis to London, returning Mon, 5 Oct, priced at £633 found 12 hours ago
KLM
Tue, 29 Sept - Tue, 6 Oct
STL
St. Louis
LHR
London
£633 Return, found 12 hours ago
£633
Return
found 12 hours ago
Select KLM flight, departing Tue, 29 Sept from St. Louis to London, returning Tue, 6 Oct, priced at £633 found 12 hours ago
KLM
Wed, 9 Dec - Fri, 22 Jan
STL
St. Louis
LHR
London
£634 Return, found 1 day ago
£634
Return
found 1 day ago
Select KLM flight, departing Wed, 9 Dec from St. Louis to London, returning Fri, 22 Jan, priced at £634 found 1 day ago
Iberia
Sun, 4 Oct - Tue, 13 Oct
STL
St. Louis
LHR
London
£638 Return, found 5 days ago
£638
Return
found 5 days ago
Select Iberia flight, departing Sun, 4 Oct from St. Louis to London, returning Tue, 13 Oct, priced at £638 found 5 days ago
Air France
Tue, 29 Sept - Mon, 5 Oct
STL
St. Louis
LHR
London
£638 Return, found 12 hours ago
£638
Return
found 12 hours ago
Select Air France flight, departing Tue, 29 Sept from St. Louis to London, returning Mon, 5 Oct, priced at £638 found 12 hours ago
Virgin Atlantic
Tue, 29 Sept - Mon, 5 Oct
STL
St. Louis
LHR
London
£638 Return, found 12 hours ago
£638
Return
found 12 hours ago
Select Virgin Atlantic flight, departing Tue, 29 Sept from St. Louis to London, returning Mon, 5 Oct, priced at £638 found 12 hours ago
KLM
Tue, 29 Sept - Mon, 5 Oct
STL
St. Louis
LHR
London
£640 Return, found 12 hours ago
£640
Return
found 12 hours ago
Select KLM flight, departing Tue, 29 Sept from St. Louis to London, returning Mon, 5 Oct, priced at £640 found 12 hours ago
Virgin Atlantic
Tue, 29 Sept - Mon, 5 Oct
STL
St. Louis
LHR
London
£641 Return, found 12 hours ago
£641
Return
found 12 hours ago
Select Virgin Atlantic flight, departing Tue, 29 Sept from St. Louis to London, returning Mon, 5 Oct, priced at £641 found 12 hours ago
British Airways
Tue, 1 Sept - Tue, 15 Sept
STL
St. Louis
LHR
London
£648 Return, found 5 days ago
£648
Return
found 5 days ago
Select British Airways flight, departing Tue, 1 Sept from St. Louis to London, returning Tue, 15 Sept, priced at £648 found 5 days ago

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Heathrow LHR. Cheapest option available. Average driving time to city centre is 28 minutes. Flights from £930
LHR
Heathrow
Cheapest
Average driving time to city centre28 min
Flights from £930

Frequently asked questions

How much does a flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) cost?
One-way flights typically cost between £278 and £1,385 and return flights often range between £506 and £2,573. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
Which airlines fly direct from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
Enter STL to LHR and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
To find a cheap flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
The best airline to fly with from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) will differ from traveller to traveller. If you like to fly early, BA offers early morning flights. If price is the most important factor, BA typically offers the lowest fares. AA offers the most daily flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
There are approximately 79 connecting flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow). Some common connection points include O'Hare Intl. (ORD), Pearson Intl. (YYZ), and Hartsfield-Jackson Atlanta Intl. (ATL).
What is the earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
The earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) typically departs at approximately 5:00 AM local time. This service is operated by American Airlines and is seasonal, active only in November. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
Wednesday typically has the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow), with around 68 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include American Airlines, United Airlines, and Delta Air Lines. Flight schedules are consistent throughout the week, so you'll find a good selection of flights on most days.
What are the most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
The most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) are between 12pm and 3pm. About 33% of passengers prefer this time. Many major carriers, including American Airlines, British Airways and United Airlines, offer flights during this window. This timing works well because it allows you to have a productive morning before heading to the airport, and you'll arrive in London with time to settle in.
How long does it take to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
A nonstop flight from STL to LHR typically takes around 8 hours, covering approximately 4,190 miles. Connecting flights on this route usually add 3 hours to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
Select the "Business class" and "First class" filters when looking for STL to LHR flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) flight with Expedia?
It's easy to earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for London from Lambert-St. Louis Intl. (STL)?
From Lambert-St. Louis Intl. (STL), you can fly into Gatwick (LGW), Heathrow (LHR) and London Intl. (YXU) in London. Some flights may connect through major hubs like Charlotte-Douglas Intl. (CLT), O'Hare Intl. (ORD), Dallas-Fort Worth Intl. (DFW) before reaching London. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) at the last minute?
Typically, booking a last minute flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) flight and hotel package?
Securing a St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow)?
If you booked your St. Louis, MO (STL-Lambert-St. Louis Intl.) to London (LHR-Heathrow) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

0
Origin airport
Lambert-St. Louis Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, KLM, Lufthansa, United, Virgin Atlantic
Return price
£631
Distance
6703 km

Book with confidence

Compare flights from St. Louis to London easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from St. Louis to London. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Heathrow in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Lambert-St. Louis Intl. to Heathrow.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Lambert-St. Louis Intl. (STL) to Heathrow (LHR)

The easiest way to view the best deals on flights from St. Louis to London today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Lambert-St. Louis Intl. to Heathrow start at just £632 and range up to £648.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near St. Louis and London
  • booking your flight during October, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your St. Louis to London flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Lambert-St. Louis Intl. to Heathrow for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from St. Louis to London easily and book with confidence

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