Cheap flights from London to St. Louis from $363
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to St. Louis departing on 8/27. 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 London to St. Louis
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 typical price of a round-trip flight between London and St. Louis?
What is the cheapest month to fly to St. Louis?
In general, March is the cheapest month to fly from London to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $740. The month of January is another great option to travel to St. Louis, with average flight prices from London averaging around $753.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $952. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,371. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from London at noon is the least expensive time of day to depart. momondo users have found prices as low as $1,075 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $1,229 per ticket.
How far in advance should I book a flight to St. Louis?
You are more likely to see cheaper flights to St. Louis from London when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $954 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from London for as low as $827 on momondo.
Can stopping save me money on London to St. Louis flights?
You could potentially save up to 23% on your flight if you consider stops on a London to St. Louis flight.
How have London to St. Louis flight prices changed over time?
As of July 2025, prices for London to St. Louis flights are approximately 33% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from London to Lambert-St Louis?
WestJet is the most popular carrier operating from London to Lambert-St Louis
What airlines fly to St. Louis?
British Airways, United Airlines and Lufthansa are the top three most popular airlines that fly to St. Louis from London according to our data. British Airways is the first choice among our users, with 37% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
When to book flights from London to St. Louis
Cheap London to St. Louis (LON to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London to St. Louis
How far is London to Lambert-St Louis by plane?
Lambert-St Louis is 4197.7 mi away from London. By plane, this route typically takes 11h 38m.
When did momondo last update prices for flights from London to Lambert-St Louis Airport?
Prices for flights from London to Lambert-St Louis Airport are refreshed on a daily basis.
How many operators does momondo search for flights from London to Lambert-St Louis Airport?
There are 3 operators available for flights from London to Lambert-St Louis Airport as of July 2025.
How old do you have to be to fly from London to Lambert-St Louis Airport?
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 London to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents you'll need for your trip to Lambert-St Louis Airport 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 Lambert-St Louis Airport. 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 London to St. Louis?
Based on momondo bookings for flights between London and St. Louis, the leading airline is British Airways, making up 100% of the total bookings.
Best airlines flying from London to St. Louis
Compare and see reviews for airlines that fly from London to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $555 | Free Cancellation | Rating 6.6 7,089 reviews | |||
| PriceFrom $925 | Free Cancellation | Rating 6.8 7,208 reviews | |||
| PriceFrom $952 | Free Cancellation | Rating 7.4 8,858 reviews |
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from London to St. Louis?
Finding the right flight to St. Louis from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.
Can I find flights from London to St. Louis with flexible booking policies on momondo?
Yes. All flights to St. Louis from London on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from London to St. Louis?
Once all potential London to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from London to St. Louis right now. Can momondo alert me if prices change?
Price alerts on flights to St. Louis from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.