Cheap flights from St. Louis to London from £157
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to London departing on 9/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from St. Louis to London
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to London?
The cheapest month to fly to London from St. Louis is in April. Flight prices, which tend to average around £566, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from St. Louis averaging around £570.
What is the cheapest day to depart on your flight to London?
Our data shows that Wednesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £571. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to London for around £942.
What is the cheapest time of day to depart on your flight to London?
The cheapest time of day to fly to London is in the morning when flights can be purchased for as low as £605. Flights in the evening are often more expensive, with an average ticket price of £1,084.
How far in advance should I book a flight to London?
You are more likely to see cheaper flights to London from St. Louis when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to London for around £711 when searching 9 weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from St. Louis for as low as £619 on momondo.
What is the cheapest airline that flies from Lambert-St Louis to London?
Air Canada, United Airlines, and Delta are the most popular carriers operating from Lambert-St Louis to London
Which airlines fly to London?
Virgin Atlantic, British Airways and KLM are the top three most popular airlines that fly to London from St. Louis according to our data. Virgin Atlantic is the first choice among our users, with 37% of people opting to fly with this airline when travelling to London. Keep in mind that there are 5 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.
When to book flights from St. Louis to London
Cheap St. Louis to London (STL to LON) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to London
How far is Lambert-St Louis to London by plane?
London is 4197.7 mi away from Lambert-St Louis. A reasonable flight in good conditions will take 10h 14m.
When did momondo last update prices for flights from Lambert-St Louis Airport to London?
Prices for flights from Lambert-St Louis Airport to London were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to London?
As of June 2025, there are 5 operators available to choose from for flights from Lambert-St Louis Airport to London.
How old do you have to be to fly from Lambert-St Louis Airport to London?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to London.
What documentation or ID do you need to fly to London?
The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from St. Louis to London?
momondo data reveals that the most frequently booked airline on the route from St. Louis to London is British Airways, representing 54% of all bookings. The subsequent popular airlines are KLM at 24% and Virgin Atlantic at 22%.
Best airlines flying from St. Louis to London
Compare and see reviews for airlines that fly from St. Louis to London with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £497 | Free Cancellation | Rating 7.1 9,573 reviews | |||
| PriceFrom £499 | Free Cancellation | Rating 6.6 7,031 reviews | |||
| PriceFrom £523 | Free Cancellation | Rating 7.4 653 reviews | |||
| PriceFrom £529 | Free Cancellation | Rating 7.8 1,365 reviews | |||
| PriceFrom £583 | Free Cancellation | Rating 7.2 10,000 reviews |
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Why should I use momondo to find a flight deal from St. Louis to London?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to London . Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from St. Louis to London with flexible booking policies on momondo?
momondo does allow users to show only those flights to London from St. Louis which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from St. Louis to London?
momondo provides multiple filters to help you find the best flight to London from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from St. Louis to London right now. Can momondo alert me if prices change?
Yes. momondo can track prices for St. Louis to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.