$436 Cheap Flights from St. Louis (STL) to London (LCY)

View $436 flight on Mon, Aug 18, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to London City Airport (LCY)

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

Prices were available within the past 7 days and start at $436 for one-way flights and $550 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Tue, Feb 3 - Mon, Feb 9
STL
St. Louis
LCY
London
$550 Roundtrip, found 12 hours ago
$550
Roundtrip
found 12 hours ago
Select British Airways flight, departing Tue, Feb 3 from St. Louis to London, returning Mon, Feb 9, priced at $550 found 12 hours ago
American Airlines
Wed, Feb 4 - Tue, Feb 10
STL
St. Louis
LCY
London
$565 Roundtrip, found 6 hours ago
$565
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Wed, Feb 4 from St. Louis to London, returning Tue, Feb 10, priced at $565 found 6 hours ago
British Airways
Wed, Sep 3 - Wed, Sep 17
STL
St. Louis
LCY
London
$571 Roundtrip, found 1 hour ago
$571
Roundtrip
found 1 hour ago
Select British Airways flight, departing Wed, Sep 3 from St. Louis to London, returning Wed, Sep 17, priced at $571 found 1 hour ago
Delta
Wed, Sep 3 - Wed, Sep 17
STL
St. Louis
LCY
London
$583 Roundtrip, found 1 hour ago
$583
Roundtrip
found 1 hour ago
Select Delta flight, departing Wed, Sep 3 from St. Louis to London, returning Wed, Sep 17, priced at $583 found 1 hour ago
Virgin Atlantic
Wed, Sep 3 - Wed, Sep 17
STL
St. Louis
LCY
London
$583 Roundtrip, found 1 hour ago
$583
Roundtrip
found 1 hour ago
Select Virgin Atlantic flight, departing Wed, Sep 3 from St. Louis to London, returning Wed, Sep 17, priced at $583 found 1 hour ago
British Airways
Wed, Sep 3 - Wed, Sep 17
STL
St. Louis
LCY
London
$589 Roundtrip, found 1 hour ago
$589
Roundtrip
found 1 hour ago
Select British Airways flight, departing Wed, Sep 3 from St. Louis to London, returning Wed, Sep 17, priced at $589 found 1 hour ago
British Airways
Wed, Sep 3 - Wed, Sep 17
STL
St. Louis
LCY
London
$603 Roundtrip, found 1 hour ago
$603
Roundtrip
found 1 hour ago
Select British Airways flight, departing Wed, Sep 3 from St. Louis to London, returning Wed, Sep 17, priced at $603 found 1 hour ago
Delta
Wed, Sep 3 - Wed, Sep 17
STL
St. Louis
LCY
London
$609 Roundtrip, found 1 hour ago
$609
Roundtrip
found 1 hour ago
Select Delta flight, departing Wed, Sep 3 from St. Louis to London, returning Wed, Sep 17, priced at $609 found 1 hour ago
American Airlines
Tue, Feb 3 - Mon, Feb 9
STL
St. Louis
LCY
London
$615 Roundtrip, found 12 hours ago
$615
Roundtrip
found 12 hours ago
Select American Airlines flight, departing Tue, Feb 3 from St. Louis to London, returning Mon, Feb 9, priced at $615 found 12 hours ago
KLM
Wed, Sep 3 - Wed, Sep 17
STL
St. Louis
LCY
London
$635 Roundtrip, found 1 hour ago
$635
Roundtrip
found 1 hour ago
Select KLM flight, departing Wed, Sep 3 from St. Louis to London, returning Wed, Sep 17, priced at $635 found 1 hour ago
Flights from St. Louis (STL) to London (LCY)
Origin airport
Lambert-St. Louis Intl.
Destination airport
London City
Airlines serving
Aer Lingus, British Airways, Delta, KLM, Lufthansa, Virgin Atlantic
Roundtrip price
$550
Distance
4207 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 February. 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 $436 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 London City Airport (LCY) cost?
Discover the latest flight deals from STL to LCY by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from STL to LCY?
The cheapest flights from STL to LCY are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from STL to LCY?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from STL to LCY. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to London City Airport (LCY)?
You'll have to hop on a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to London City Airport (LCY). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from STL to LCY?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*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 London City Airport (LCY)?
To arrive at London City Airport (LCY) on schedule, choose a flight that leaves Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 London City Airport (LCY) last-minute?
Last-minute bookings from STL to LCY are typically more expensive. For the best rates, start searching for flights well in advance. That said, if you can play around with your travel dates, you may score a cheap ticket right before your trip.
Is it cheaper to book a STL to LCY flight and hotel package?
You'll typically save money by securing a STL to LCY flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. After selecting your ideal accommodations and flights, consider adding extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to London City Airport (LCY)?
In most cases, you can cancel or reschedule your STL to LCY flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's policies and fees on flight changes, or if you need further details, visit our Customer Service portal.

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*Available to One Key members.