Q: How much does it cost for a return flight from St. Louis to London?

Airfare is below average for this route at the moment. St. Louis to London flights typically cost between £536 and £689 in September. The cheapest return flight price found within the last 3 days was £392 on British Airways (21 Sept-7 Oct).

Question 1

What’s the fastest stopover option from St. Louis to London?

Accepted Answer

Flights via Chicago (ORD) have the shortest average one-way travel time for one-stop routes: 10h 10m.

Question 2

Which airport typically offers the quickest stopover for flights from St. Louis to London?

Accepted Answer

Flights via Chicago (ORD) offer the fastest connection on this route, with an average stopover time of 1h 30m.

Question 3

What’s the top stopover airport for flights from St. Louis to London?

Accepted Answer

Chicago (ORD) – chosen by Cheapflights users on 46% of one-stop itineraries from St. Louis to London on Cheapflights.

Question 4

What’s the cheapest stopover airport for flights from St. Louis to London?

Accepted Answer

Montreal (YUL) is the most affordable one-stop option, with an average return flight price of £642.

Question 5

How much does it cost for a return flight from St. Louis to London?

Accepted Answer

Airfare is below average for this route at the moment.St. Louis to London flights typically cost between £536 and £689 in September.
The cheapest return flight price found within the last 3 days was £392 on British Airways (21 Sept-7 Oct).

Question 6

How long is the flight from St. Louis to London?

Accepted Answer

A quick flight from St. Louis to London can take about 12h 34m. British Airways provides one of the quickest options available for as low as £392. The distance between St. Louis and London is about 4186 mi. Both multi-stop and direct flights can be found to your destination and back.

Question 7

What are the cheapest airlines flying from St. Louis to London round-trip?

Accepted Answer

Air Canada, at £435, was found to be the cheapest airline from St. Louis to London.Alternate airlines flying return to your destination include Virgin Atlantic and British Airways. Users have found that Air Canada is 37% cheaper than the other options available to this destination.

Question 8

How far ahead should I book a flight from St. Louis to London?

Accepted Answer

Booking 81 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Question 9

What is the cheapest month to book a flight from St. Louis to London?

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from St. Louis to London (average of £112). Flying from St. Louis to London in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Question 10

What is the cheapest day to fly from St. Louis to London?

Accepted Answer

Travellers seeking maximum savings on their St. Louis to London flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Question 11

E

Accepted Answer

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

Question 12

E

Accepted Answer

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Question 13

What are the most popular routes from St. Louis to London?

Accepted Answer

While some choose either Lambert-St Louis - London Gatwick or Lambert-St Louis - London City, Lambert-St Louis - London Heathrow is the most popular route from St. Louis to London.

Question 14

What are the most popular airlines that fly from St. Louis to London?

Accepted Answer

Air Canada, British Airways and KLM are the most popular airlines when flying from St. Louis to London.

Question 15

What is the cheapest day to fly round-trip from St. Louis to London?

Accepted Answer

Wednesday flights are generally found to be more expensive for flights from St. Louis to London. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London.

Question 16

How far in advance should I book a flight from St. Louis to London?

Accepted Answer

To save up to 150% on this flight, we recommend booking at least 13 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from St. Louis to London from £470 1-2 weeks out and tickets from £1,177 for flights departing within the next 72 hours.

Question 17

What is the cheapest month to fly from St. Louis to London?

Accepted Answer

April is one of the best times of the year to fly to London from St. Louis. Prices for April average £693 per person but you can even find prices for as low as £495. The most expensive prices can be found in the month of June. Opting for a April flight can save you 43% on your journey compared to booking in June

Question 18

What is the cheapest time of day to fly from STL to LON?

Accepted Answer

It’s optimal to fly from St. Louis to London in the morning. By choosing this option you can save up to 45% on the cost of your flight, compared to a flight in the evening.

Question 19

What airport do you fly from for flights from St. Louis to London?

Accepted Answer

Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to London. On average, Lambert-St Louis has 0 outbound flights to London per day from 4 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

Question 20

Can I find deals for flights from St. Louis to London that include hotel bookings?

Accepted Answer

Yes. In addition to deals on St. Louis to London flights, Cheapflights offers holiday packages that include both flights and hotel.

Question 21

How can I find direct flights from St. Louis to London?

Accepted Answer

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to London.

Question 22

Can I find deals for business class flights from St. Louis to London?

Accepted Answer

Yes. Cheapflights offers flight deals from St. Louis to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Question 23

How does Cheapflights help users find flights from St. Louis to London?

Accepted Answer

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from St. Louis to London. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Question 24

Why should you use Cheapflights to find cheap flight tickets from St. Louis to London?

Accepted Answer

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Question 25

Can Cheapflights find flights from St. Louis to London with no change fees?

Accepted Answer

Yes! Cheapflights helps users easily find flights from St. Louis to London with no change fees.

Question 26

Can Cheapflights notify me if prices for flights from St. Louis to London become cheaper?

Accepted Answer

Yes! Start tracking prices for St. Louis to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

Round-trip from	£392
One-way from	£171
Popular in	June
Cheapest in	April
Average price	£594

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest£435	Average£648	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Virgin Atlantic	Cheapest£470	Average£800	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£490	Average£677	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£529	Average£797	FlexibilityNo cancel fee	On-time75%	Search KLM flights

Cheap flights from St. Louis to London from £171

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 29/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in April or October, booked 81 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

Cheap flight deals from St. Louis to London

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Find flight deals from St. Louis to London

Cheapest flights from St. Louis to LondonExplore the most affordable flight options available from St. Louis to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 August 2025.

Explore the most affordable flight options available from St. Louis to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 August 2025.

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Best time to book a flight from St. Louis to London

Have a flexible travel schedule? Discover the best time to fly to London from St. Louis with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to London

How far ahead should I book a flight from St. Louis to London?

Use this chart to determine the optimal time to book a return flight from St. Louis to London. Price data was last updated on 8 August 2025.

What is the cheapest month to book a flight from St. Louis to London?

What is the cheapest time of day to fly from STL to LON?

Find hourly flight availability from St. Louis to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 22 August 2025.

How much does it cost for a return flight from St. Louis to London?

What’s the top stopover airport for flights from St. Louis to London?

Share of one-stop return flights from St. Louis to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

What’s the cheapest stopover airport for flights from St. Louis to London?

Average return fare for one-stop flights from St. Louis to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

What’s the fastest stopover option from St. Louis to London?

Shortest average travel time for one-stop one-way flights from St. Louis to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Which airport typically offers the quickest stopover for flights from St. Louis to London?

Average stopover duration for one-stop one-way flights from St. Louis to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Reviews of airlines servicing London

Read through reviews of airlines operating flights from St. Louis to London, such as KLM, Virgin Atlantic, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from St. Louis to London?

How long is the flight from St. Louis to London?

What are the cheapest airlines flying from St. Louis to London round-trip?

What are the most popular routes from St. Louis to London?

Can I find deals for flights from St. Louis to London that include hotel bookings?

How can I find direct flights from St. Louis to London?

Can I find deals for business class flights from St. Louis to London?

What is the cheapest month to book a flight from St. Louis to London?

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Top 4 airlines flying from St. Louis to London

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Can Cheapflights find flights from St. Louis to London with no change fees?

Can Cheapflights notify me if prices for flights from St. Louis to London become cheaper?

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Cheapest flights from St. Louis to London
Explore the most affordable flight options available from St. Louis to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 August 2025.