€337 Cheap Flights St. Louis to London (STL-LHR)

View €337 flight on Mon, 3 Nov 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at €337 for one-way flights and €452 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sun, 28 Sep - Thu, 16 Oct
STL
St. Louis
LHR
London
€452 Return, found 3 days ago
€452
Return
found 3 days ago
Select American Airlines flight, departing Sun, 28 Sep from St. Louis to London, returning Thu, 16 Oct, priced at €452 found 3 days ago
Iberia
Sun, 28 Sep - Thu, 16 Oct
STL
St. Louis
LHR
London
€452 Return, found 3 days ago
€452
Return
found 3 days ago
Select Iberia flight, departing Sun, 28 Sep from St. Louis to London, returning Thu, 16 Oct, priced at €452 found 3 days ago
British Airways
Sun, 28 Sep - Thu, 16 Oct
STL
St. Louis
LHR
London
€452 Return, found 3 days ago
€452
Return
found 3 days ago
Select British Airways flight, departing Sun, 28 Sep from St. Louis to London, returning Thu, 16 Oct, priced at €452 found 3 days ago
Delta
Sun, 28 Sep - Thu, 16 Oct
STL
St. Louis
LHR
London
€452 Return, found 3 days ago
€452
Return
found 3 days ago
Select Delta flight, departing Sun, 28 Sep from St. Louis to London, returning Thu, 16 Oct, priced at €452 found 3 days ago
Virgin Atlantic
Sun, 14 Sep - Tue, 30 Sep
STL
St. Louis
LHR
London
€454 Return, found 2 days ago
€454
Return
found 2 days ago
Select Virgin Atlantic flight, departing Sun, 14 Sep from St. Louis to London, returning Tue, 30 Sep, priced at €454 found 2 days ago
Delta
Sun, 14 Sep - Tue, 30 Sep
STL
St. Louis
LHR
London
€477 Return, found 2 days ago
€477
Return
found 2 days ago
Select Delta flight, departing Sun, 14 Sep from St. Louis to London, returning Tue, 30 Sep, priced at €477 found 2 days ago
British Airways
Thu, 11 Sep - Thu, 18 Sep
STL
St. Louis
LHR
London
€487 Return, found 6 days ago
€487
Return
found 6 days ago
Select British Airways flight, departing Thu, 11 Sep from St. Louis to London, returning Thu, 18 Sep, priced at €487 found 6 days ago
KLM
Sun, 14 Sep - Tue, 30 Sep
STL
St. Louis
LHR
London
€499 Return, found 2 days ago
€499
Return
found 2 days ago
Select KLM flight, departing Sun, 14 Sep from St. Louis to London, returning Tue, 30 Sep, priced at €499 found 2 days ago
KLM
Sun, 14 Sep - Tue, 30 Sep
STL
St. Louis
LHR
London
€504 Return, found 2 days ago
€504
Return
found 2 days ago
Select KLM flight, departing Sun, 14 Sep from St. Louis to London, returning Tue, 30 Sep, priced at €504 found 2 days ago
Delta
Thu, 11 Sep - Thu, 18 Sep
STL
St. Louis
LHR
London
€504 Return, found 6 days ago
€504
Return
found 6 days ago
Select Delta flight, departing Thu, 11 Sep from St. Louis to London, returning Thu, 18 Sep, priced at €504 found 6 days ago

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

October is typically the cheapest month to fly

From €458 - €1,304 per traveller.

Graph displaying average flight prices per month

St. Louis to London route information
Origin airport
Lambert-St. Louis Intl.
Destination airport
Heathrow
Return price
€451
Distance
6703 km

Perfect flights from St. Louis to London

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from St. Louis to London. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Lambert-St. Louis Intl. to Heathrow ticket options cater to your travel preferences, with incredible one-way fares from €337 and roundtrip prices from €452. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Heathrow and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in London.

Frequently asked questions

How much is a flight from St. Louis Lambert International Airport to LHR?
Pack your bags, because round-trip flights between STL and LHR start from €452. That's based on airfares listed within the last 7 days on Expedia for flights departing within the next year. Prices can go up quickly, so book now to lock in the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Lambert-St. Louis Intl. Airport (STL) to London Heathrow?
This can differ between air carriers, as each one has its own terms and conditions. Visit the Customer Service Portal, where there are easy instructions on how to cancel online.
How do I find cheap flights from St. Louis Lambert International Airport to Heathrow Airport that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from St. Louis Lambert International Airport to LHR?
With around 6,800 kilometres separating St. Louis and Hounslow, your flight will be a long one. Pack wisely to make your time in the air comfortable. Things like a spare pair of socks and a cosy travel pillow should be in your hand luggage.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to London Heathrow?
Unfortunately, there aren't any airlines that fly directly between St. Louis Lambert International Airport and Heathrow Airport. You'll need to book a flight with one or more stops.
Are Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) flight tickets cheaper when they're purchased at the last minute?
It is possible to get an awesome last-minute deal from Lambert Field to Heathrow Airport, but it's also possible to miss out altogether! As many airlines release prices up to 12 months in advance, it's worthwhile keeping an eye on fares early and being ready to pounce when you see a bargain. Expedia compares air carrier prices and updates flight deals frequently, so you can rest easy knowing you're always seeing the latest offers.

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