$441 Cheap Flights from St. Louis (STL) to London (LHR)

View $441 flight on Wed, May 6, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $441 for one-way flights and $460 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Fri, Apr 3 - Wed, Apr 8
STL
St. Louis
LHR
London
$460 Roundtrip, found 2 hours ago
$460
Roundtrip
found 2 hours ago
Select British Airways flight, departing Fri, Apr 3 from St. Louis to London, returning Wed, Apr 8, priced at $460 found 2 hours ago
American Airlines
Fri, Apr 3 - Wed, Apr 8
STL
St. Louis
LHR
London
$460 Roundtrip, found 2 hours ago
$460
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Fri, Apr 3 from St. Louis to London, returning Wed, Apr 8, priced at $460 found 2 hours ago
Iberia
Fri, Apr 3 - Wed, Apr 8
STL
St. Louis
LHR
London
$460 Roundtrip, found 2 hours ago
$460
Roundtrip
found 2 hours ago
Select Iberia flight, departing Fri, Apr 3 from St. Louis to London, returning Wed, Apr 8, priced at $460 found 2 hours ago
American Airlines
Thu, Mar 12 - Mon, Mar 23
STL
St. Louis
LHR
London
$510 Roundtrip, just found
$510
Roundtrip
just found
Select American Airlines flight, departing Thu, Mar 12 from St. Louis to London, returning Mon, Mar 23, priced at $510 just found
Iberia
Tue, Mar 3 - Tue, Mar 10
STL
St. Louis
LHR
London
$511 Roundtrip, found 3 hours ago
$511
Roundtrip
found 3 hours ago
Select Iberia flight, departing Tue, Mar 3 from St. Louis to London, returning Tue, Mar 10, priced at $511 found 3 hours ago
American Airlines
Thu, Mar 12 - Mon, Mar 23
STL
St. Louis
LHR
London
$514 Roundtrip, just found
$514
Roundtrip
just found
Select American Airlines flight, departing Thu, Mar 12 from St. Louis to London, returning Mon, Mar 23, priced at $514 just found
Delta
Thu, Mar 12 - Mon, Mar 23
STL
St. Louis
LHR
London
$518 Roundtrip, just found
$518
Roundtrip
just found
Select Delta flight, departing Thu, Mar 12 from St. Louis to London, returning Mon, Mar 23, priced at $518 just found
British Airways
Tue, Jan 27 - Mon, Feb 2
STL
St. Louis
LHR
London
$521 Roundtrip, found 1 hour ago
$521
Roundtrip
found 1 hour ago
Select British Airways flight, departing Tue, Jan 27 from St. Louis to London, returning Mon, Feb 2, priced at $521 found 1 hour ago
Virgin Atlantic
Sun, Nov 16 - Tue, Dec 2
STL
St. Louis
LHR
London
$524 Roundtrip, just found
$524
Roundtrip
just found
Select Virgin Atlantic flight, departing Sun, Nov 16 from St. Louis to London, returning Tue, Dec 2, priced at $524 just found
KLM
Tue, Mar 10 - Fri, Mar 20
STL
St. Louis
LHR
London
$591 Roundtrip, just found
$591
Roundtrip
just found
Select KLM flight, departing Tue, Mar 10 from St. Louis to London, returning Fri, Mar 20, priced at $591 just found

Find the cheapest month to fly from St. Louis (STL) to London (LHR)

October is typically the cheapest month to fly

From $520 - $1,513 per traveler.

Graph displaying average flight prices per month

Alternative airports near London

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

Select flight to Gatwick LGW. Cheapest option available. Average driving time to city center is 52 minutes. Flights from $595
LGW
Gatwick
Cheapest
Average driving time to city center52 min
Flights from $595
Select flight to London City LCY. Closest option available. Average driving time to city center is 21 minutes. Flights from $1,132
LCY
London City
Closest
Average driving time to city center21 min
Flights from $1,132
Flights from St. Louis (STL) to London (LHR)
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, Scandinavian Airlines, Turkish Airlines, United, Virgin Atlantic
Roundtrip price
$459
Distance
4189 mi

St. Louis to London Flights

The cheapest times to fly from St. Louis to London

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to London are during the month of April. You can find some of the cheapest flights from St. Louis to London with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to London

Sunday is one of the best days to book for cheap flights from St. Louis to London: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to London

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to London in 2025. You can also book with separate airlines for your outbound and return journeys, from $441 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to London flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to London airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) cost?
Snag a cheap one-way flight from $441 or cheap return flight from $460 from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
Planning your trip for April may help you find better deals, as it's the cheapest month for flights between STL and LHR. You'll typically find the lowest prices during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from STL to LHR. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to LHR?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary depending on various factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
Select a flight from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) that leaves before 3 PM to reduce the risk of cancellations. Departures after this hour are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) last-minute?
Booking your flight from STL to LHR shortly before your getaway is generally more expensive. However, if you're flexible with your itinerary, you could score a cheap last-minute fare.
Is it cheaper to book a STL to LHR flight and hotel package?
Compared with arranging hotels and flights separately, booking a STL to LHR flight and hotel package with Expedia could lead to significant savings. Better still, having it all in one place will take the hassle out of travel planning. Simply secure your flights and select from our wide range of hotels, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
If you reserved your STL to LHR flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you want more information.

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*Available to One Key members.