Cheap flights from St. Louis to London Heathrow Airport from £290
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 Heathrow Airport departing on 12/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Deals available from 900+ travel sites.
Big names, great deals
Big names, great deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customise your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from St. Louis to London
Cheap return flights
Cheap one-way flights
Cheap last-minute flights
Air Canada flights from St. Louis to London Heathrow Airport
Our best Air Canada deals on St. Louis to London Heathrow Airport flight tickets
United Airlines flights from St. Louis to London Heathrow Airport
Our best United Airlines deals on St. Louis to London Heathrow Airport flight tickets
See travel insights to London from
How to get the cheapest flight ticket from St. Louis to London Heathrow Airport
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 Heathrow Airport?
In general, October is the cheapest month to fly from St. Louis to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £636. The month of March is another great option to travel to London Heathrow Airport, with average flight prices from St. Louis averaging around £638.
What is the cheapest day to depart on your flight to London Heathrow Airport?
On average, the least expensive day to fly to London Heathrow Airport from St. Louis is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £589. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Friday is £1,399.
What is the cheapest time of day to depart on your flight to London Heathrow Airport?
According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from St. Louis to London Heathrow Airport in the morning for as low as £713. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £883 on average. Flights to London Heathrow Airport from St. Louis in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.
How far in advance should I book a flight to London Heathrow Airport?
You are more likely to see cheaper flights to London Heathrow Airport from St. Louis when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £753 when searching 9 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from St. Louis for as low as £630 on momondo.
What is the cheapest airline that flies from Lambert-St Louis to London Heathrow?
WestJet, United Airlines, and Air Canada are the most popular carriers operating from Lambert-St Louis to London Heathrow
Which airlines fly to London Heathrow Airport?
Virgin Atlantic, British Airways and KLM are the top three most popular airlines that fly to London Heathrow Airport from St. Louis according to our data. Virgin Atlantic is the first choice among our users, with 33% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 5 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.
When to book flights from St. Louis to London Heathrow Airport
Cheap St. Louis to London Heathrow Airport (STL to LHR) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to London Heathrow Airport
How far is Lambert-St Louis to London Heathrow by plane?
Lambert-St Louis and London Heathrow are 4185.8 mi apart from one another. By plane, this route typically takes 9h 51m.
When did momondo last update prices for flights from Lambert-St Louis Airport to London Heathrow Airport?
Prices for flights from Lambert-St Louis Airport to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to London Heathrow Airport?
As of February 2025, there are 5 operators available to choose from for flights from Lambert-St Louis Airport to London Heathrow Airport.
How old do you have to be to fly from Lambert-St Louis Airport to London Heathrow Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The travel and health documents you'll need for your trip to London Heathrow 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 London Heathrow 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 St. Louis to London Heathrow Airport?
momondo data reveals that the most frequently booked airline on the route from St. Louis to London Heathrow Airport is Virgin Atlantic, representing 29% of all bookings. The subsequent popular airlines are British Airways at 28%, KLM at 19%, and United Airlines at 12%.
Best airlines flying from St. Louis to London Heathrow Airport
Compare and see reviews for airlines that fly from St. Louis to London Heathrow Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £540 | Free Cancellation | Rating 7.4 8,765 reviews | |||
| PriceFrom £547 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom £564 | Free Cancellation | Rating 7.8 1,333 reviews | |||
| PriceFrom £605 | Free Cancellation | Rating 6.6 6,762 reviews | |||
| PriceFrom £631 | Free Cancellation | Rating 7.5 654 reviews |
Travelling to a place near London?
Book flights to London if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from St. Louis to London?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from St. Louis.
Can I find flights from St. Louis to London with flexible booking policies on momondo?
Yes. All flights to London from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from St. Louis to London?
Once you have performed a search for St. Louis to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
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.