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

According to our current data, Iberia ($718), Delta ($720), and Finnair ($721) offers the cheapest pricing from St. Louis to London. These flights start at 21% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from St. Louis to London one-way?

The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $426. However, be on the lookout for offers from United Airlines and British Airways, as they are both options that can get you from St. Louis to London for a low price.

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

Travelers seeking maximum savings on their St. Louis to London flight should consider departing on Saturday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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

The most popular flight routes from St. Louis to London are Lambert-St Louis - London Heathrow, Lambert-St Louis - London Gatwick and Lambert-St Louis - London City.

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

When booking a flight from St. Louis to London, you may want to consider flying on American Airlines, Air Canada or British Airways as they are the most popular for this route.

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

Monday 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.

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

Travelers have found it’s best to book a flight 27 days in advance to save up to 26% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 27 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from St. Louis to London 1-2 weeks in advance for as low as $846, or $846 for flights within the next 24 hours.

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

Flights from St. Louis to London lean towards being more expensive in June. Prices are generally better when you fly from St. Louis to London in April, with the cheapest ticket starting at $668.

Most accurate provider : When it comes to deals on St. Louis-London flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-London flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from St. Louis-London flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on St. Louis-London flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to London. You should not have trouble finding flights to London from Lambert-St Louis; the airport handles an average of 0 outbound flights to London per day. You should also have plenty of airline options to choose from since 10 airlines have flights from the St. Louis airport to London. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

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

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

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

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.

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

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.

$258+ Flights from St. Louis to London - Compare & Save Big

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Find cheap flights from St. Louis to London with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in April or November, booked 26 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from St. Louis to London

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$718 (Cheapflightsfares)
One-way from	$258 (Kiwi.com)
Popular in	June
Cheapest in	April
Average price	$773

Provider with most accurate pricing for Lambert-St Louis-London (LON) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-London (LON) flights.

Search Deals

From Lambert-St Louis to London (LON)

Search Deals

One-way flight from Lambert-St Louis to London (LON)

Search Deals

Highest demand for flights based on searches. 15% potential increase in price ($171 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($25 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

Find flight deals from St. Louis to London

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 April 30, 2025.

Tue 8/192:39 pmSTL - LHR

1 stop11h 26mIberia

Tue 8/2612:15 pmLHR - STL

1 stop13h 58mIberia

Deal found 4/29

$718

Wed 8/2711:51 amSTL - LGW

2 stops16h 09mDelta

Mon 9/812:00 pmLGW - STL

2 stops17h 39mDelta

Deal found 4/29

$720

Tue 8/194:18 pmSTL - LHR

1 stop12h 12mFinnair

Tue 8/264:10 pmLHR - STL

2 stops32h 20mFinnair

Deal found 4/29

$721

Thu 8/143:30 pmSTL - LHR

2 stops20h 10mScandinavian Airlines

Wed 8/206:40 amLHR - STL

2 stops22h 59mScandinavian Airlines

Deal found 4/29

$732

Wed 8/201:30 pmSTL - LHR

1 stop14h 30mMultiple Airlines

Wed 8/2710:30 amLHR - STL

2 stops15h 30mMultiple Airlines

Deal found 4/29

$747

Wed 7/301:29 pmSTL - LHR

1 stop11h 46mDelta

Wed 8/1311:45 amLHR - STL

2 stops17h 54mDelta

Deal found 4/29

$748

Tue 5/135:45 pmSTL - LGW

1 stop34h 15mMultiple Airlines

Tue 5/202:00 pmLGW - STL

1 stop15h 44mMultiple Airlines

Deal found 4/29

$754

Wed 8/201:15 pmSTL - LHR

1 stop12h 40mBritish Airways

Wed 8/273:10 pmLHR - STL

1 stop14h 04mBritish Airways

Deal found 4/29

$756

Tue 8/261:30 pmSTL - LHR

2 stops25h 30mAir Canada

Wed 9/102:05 pmLHR - STL

2 stops31h 39mAir Canada

Deal found 4/29

$760

Sat 10/114:05 pmSTL - LHR

1 stop32h 30mUnited Airlines

Tue 10/212:05 pmLHR - STL

2 stops26h 29mUnited Airlines

Deal found 4/29

$767

Tue 8/265:30 pmSTL - LHR

2 stops19h 10mLufthansa

Fri 9/59:30 amLHR - STL

2 stops16h 09mLufthansa

Deal found 4/29

$800

Tue 9/98:01 pmSTL - LCY

2 stops38h 29mBritish Airways

Tue 9/237:00 pmLCY - STL

2 stops31h 21mBritish Airways

Deal found 4/29

$823

Best flights from St. Louis to London
Discover carefully curated flight deals from St. Louis to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2025.

Tue 8/192:39 pmSTL - LHR

1 stop11h 26mIberia

Tue 8/2612:15 pmLHR - STL

1 stop13h 58mIberia

Deal found 4/29

$718

Wed 8/2711:51 amSTL - LGW

2 stops16h 09mDelta

Mon 9/812:00 pmLGW - STL

2 stops17h 39mDelta

Deal found 4/29

$720

Tue 8/194:18 pmSTL - LHR

1 stop12h 12mFinnair

Tue 8/264:10 pmLHR - STL

2 stops32h 20mFinnair

Deal found 4/29

$721

Thu 8/143:30 pmSTL - LHR

2 stops20h 10mScandinavian Airlines

Wed 8/206:40 amLHR - STL

2 stops22h 59mScandinavian Airlines

Deal found 4/29

$732

Wed 8/201:30 pmSTL - LHR

1 stop14h 30mMultiple Airlines

Wed 8/2710:30 amLHR - STL

2 stops15h 30mMultiple Airlines

Deal found 4/29

$747

Wed 8/201:15 pmSTL - LHR

1 stop12h 40mBritish Airways

Wed 8/273:10 pmLHR - STL

1 stop14h 04mBritish Airways

Deal found 4/29

$756

Tue 8/261:30 pmSTL - LHR

2 stops25h 30mAir Canada

Wed 9/102:05 pmLHR - STL

2 stops31h 39mAir Canada

Deal found 4/29

$760

Sat 10/114:05 pmSTL - LHR

1 stop32h 30mUnited Airlines

Tue 10/212:05 pmLHR - STL

2 stops26h 29mUnited Airlines

Deal found 4/29

$767

Tue 8/265:30 pmSTL - LHR

2 stops19h 10mLufthansa

Fri 9/59:30 amLHR - STL

2 stops16h 09mLufthansa

Deal found 4/29

$800

Fri 10/176:35 amSTL - LCY

2 stops22h 15mAer Lingus

Tue 10/216:45 amLCY - STL

2 stops17h 18mAer Lingus

Deal found 4/29

$1,065

Wed 8/65:00 amSTL - LGW

2 stops22h 55mTurkish Airlines

Wed 8/135:15 pmLGW - STL

2 stops35h 30mTurkish Airlines

Deal found 4/29

$1,444

Wed 7/301:29 pmSTL - LHR

1 stop11h 46mDelta

Wed 8/1311:45 amLHR - STL

2 stops17h 54mDelta

Deal found 4/29

$748

Last-minute flights from St. Louis to London
Discover last-minute flight deals from St. Louis to London. Data last updated April 30, 2025 and is based on user searches.

Thu 5/112:00 pmSTL - LHR

1 stop13h 20mIberia

Wed 5/72:25 pmLHR - STL

1 stop15h 26mIberia

Deal found 4/29

$908

Mon 5/54:50 pmSTL - LHR

1 stop32h 50mUnited Airlines

Thu 5/155:40 pmLHR - STL

1 stop24h 56mUnited Airlines

Deal found 4/29

$923

Mon 5/54:05 pmSTL - LHR

2 stops19h 35mScandinavian Airlines

Thu 5/159:05 pmLHR - STL

3 stops29h 34mScandinavian Airlines

Deal found 4/29

$2,739

Tue 5/65:32 pmSTL - LHR

1 stop13h 58mDelta

Tue 5/136:15 amLHR - STL

2 stops16h 45mDelta

Deal found 4/29

$849

Tue 5/61:30 pmSTL - LHR

1 stop14h 30mMultiple Airlines

Wed 5/1410:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 4/29

$897

Tue 5/610:31 amSTL - LHR

2 stops20h 54mAer Lingus

Sat 5/101:25 pmLHR - STL

2 stops16h 26mAer Lingus

Deal found 4/29

$1,286

Tue 5/610:31 amSTL - LGW

2 stops18h 19mIberia

Tue 5/138:40 pmLGW - STL

2 stops27h 53mIberia

Deal found 4/29

$1,351

Tue 5/63:43 pmSTL - LGW

2 stops24h 37mTurkish Airlines

Sat 5/1010:55 amLGW - STL

2 stops34h 52mTurkish Airlines

Deal found 4/29

$1,463

Tue 5/61:30 pmSTL - LHR

1 stop14h 30mAir Canada

Sat 5/109:30 amLHR - STL

1 stop16h 28mAir Canada

Deal found 4/29

$1,813

Wed 5/74:52 pmSTL - LHR

1 stop11h 58mFinnair

Fri 5/302:10 pmLHR - STL

1 stop13h 42mFinnair

Deal found 4/29

$1,032

Wed 5/71:38 pmSTL - LCY

2 stops20h 52mBritish Airways

Fri 5/304:55 pmLCY - STL

2 stops31h 26mBritish Airways

Deal found 4/29

$1,230

Fri 5/95:55 pmSTL - LGW

1 stop34h 05mMultiple Airlines

Tue 5/132:00 pmLGW - STL

1 stop16h 06mMultiple Airlines

Deal found 4/29

$787

One-way flights from St. Louis to London
Search for one-way flight options from St. Louis to London. Find affordable one-way fares based on user searches. Data last updated April 30, 2025.

Wed 7/95:40 pmSTL - LGW

1 stop34h 20mMultiple Airlines

Deal found 4/29

$258

Fri 7/255:40 pmSTL - LHR

2 stops44h 40mMultiple Airlines

Deal found 4/29

$348

Mon 9/2911:51 amSTL - LHR

2 stops13h 24mDelta

Deal found 4/29

$426

Fri 9/194:05 pmSTL - LHR

2 stops46h 55mUnited Airlines

Deal found 4/28

$468

Wed 7/910:30 amSTL - LGW

2 stops17h 30mDelta

Deal found 4/29

$479

Mon 9/298:26 amSTL - LCY

2 stops26h 04mBritish Airways

Deal found 4/29

$492

Fri 7/251:16 pmSTL - LHR

1 stop12h 49mIberia

Deal found 4/29

$493

Fri 9/191:30 pmSTL - LHR

1 stop11h 00mAir Canada

Deal found 4/28

$511

Fri 9/1912:10 pmSTL - LCY

2 stops14h 00mDelta

Deal found 4/28

$556

Mon 9/291:00 pmSTL - LCY

3 stops17h 30mMultiple Airlines

Deal found 4/29

$593

Tue 5/61:30 pmSTL - STN

3 stops27h 20mMultiple Airlines

Deal found 4/29

$607

Wed 5/143:43 pmSTL - LCY

2 stops14h 47mUnited Airlines

Deal found 4/29

$609

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/19

2:39 pm-8:05 am

1 stop11h 26m

London Heathrow

Tue 8/26

12:15 pm-8:13 pm

1 stop13h 58m

$718

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 8/27

11:51 am-10:00 am

2 stops16h 09m

London Gatwick

Mon 9/8

12:00 pm-11:39 pm

2 stops17h 39m

$720

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/19

4:18 pm-10:30 am

1 stop12h 12m

London Heathrow

Tue 8/26

4:10 pm-6:30 pm

2 stops32h 20m

$721

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 8/14

3:30 pm-5:40 pm

2 stops20h 10m

London Heathrow

Wed 8/20

6:40 am-11:39 pm

2 stops22h 59m

$732

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/20

1:30 pm-10:00 am

1 stop14h 30m

London Heathrow

Wed 8/27

10:30 am-8:00 pm

2 stops15h 30m

$747

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 7/30

1:29 pm-7:15 am

1 stop11h 46m

London Heathrow

Wed 8/13

11:45 am-11:39 pm

2 stops17h 54m

$748

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Tue 5/13

5:45 pm-10:00 am

1 stop34h 15m

London Gatwick

Tue 5/20

2:00 pm-11:44 pm

1 stop15h 44m

$754

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/20

1:15 pm-7:55 am

1 stop12h 40m

London Heathrow

Wed 8/27

3:10 pm-11:14 pm

1 stop14h 04m

$756

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/26

1:30 pm-9:00 pm

2 stops25h 30m

London Heathrow

Wed 9/10

2:05 pm-3:44 pm

2 stops31h 39m

$760

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 10/11

4:05 pm-6:35 am

1 stop32h 30m

London Heathrow

Tue 10/21

2:05 pm-10:34 am

2 stops26h 29m

$767

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 40 results

Compare providers for flights from St. Louis to London

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to London in April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
oojo	Price Accuracy3 stars	Trust Score*3 stars
ScholarTrip	Price Accuracy3 stars	Trust Score*3 stars
Thrive Travel	Price Accuracy3 stars	Trust Score*2 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
Gotogate	Price Accuracy3 stars	Trust Score*2 stars
Trip.com	Price Accuracy1 star	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on St. Louis-London flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-London flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from St. Louis-London flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on St. Louis-London flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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?

The best time to book flights from St. Louis to London is 26 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, November is the cheapest month in which you can book a flight from St. Louis to London (average of $661). Flying from St. Louis to London in June is currently the most expensive (average of $1,110). 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.

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

It’s optimal to fly from St. Louis to London in the morning. By choosing this option you can save up to 5% on the cost of your flight, compared to a flight at noon.

Rainfall in London by month

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

Temperature in London by month

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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing London

Read reviews from past customers who have flown Delta, Finnair and United Airlines from St. Louis to London. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very good

7,929 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair

7.6

Good

1,275 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines

7.4

Good

8,696 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Turkish Airlines

7.3

Good

3,788 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Scandinavian Airlines

7.3

Good

1,349 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What airport do you fly from for flights from St. Louis to London?
Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to London. You should not have trouble finding flights to London from Lambert-St Louis; the airport handles an average of 0 outbound flights to London per day. You should also have plenty of airline options to choose from since 10 airlines have flights from the St. Louis airport to London. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.
What are the cheapest airlines flying from St. Louis to London round-trip?
According to our current data, Iberia ($718), Delta ($720), and Finnair ($721) offers the cheapest pricing from St. Louis to London. These flights start at 21% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from St. Louis to London one-way?
The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $426. However, be on the lookout for offers from United Airlines and British Airways, as they are both options that can get you from St. Louis to London for a low price.
What are the most popular routes from St. Louis to London?
The most popular flight routes from St. Louis to London are Lambert-St Louis - London Heathrow, Lambert-St Louis - London Gatwick and Lambert-St Louis - London City.
Can I find deals for flights from St. Louis to London that include hotel bookings?
Yes. In addition to deals on St. Louis to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to London?
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.
Can I find deals for business class flights from St. Louis to London?
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.
What is the cheapest month to book a flight from St. Louis to London?
Currently, November is the cheapest month in which you can book a flight from St. Louis to London (average of $661). Flying from St. Louis to London in June is currently the most expensive (average of $1,110). 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.

See more FAQs

Hayes

Hounslow

Thornton Heath

Luton

Horley

Canterbury

Harrow

Wembley

Dover

Gatwick

Orpington

Watford

Croydon

Borehamwood

Folkestone

Ilford

Aylesbury

Sutton

Chelmsford

Brentwood

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from St. Louis to London

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$651	Average$933	FlexibilityNo cancel fee	On-time71%
Scandinavian Airlines	Cheapest$669	Average$1,102	FlexibilityNo cancel fee	On-time77%
Iberia	Cheapest$672	Average$968	FlexibilityNo cancel fee	On-time77%
United Airlines	Cheapest$702	Average$956	FlexibilityNo cancel fee	On-time69%
Virgin Atlantic	Cheapest$703	Average$913	FlexibilityNo cancel fee	On-time72%
British Airways	Cheapest$705	Average$985	FlexibilityNo cancel fee	On-time70%
KLM	Cheapest$726	Average$896	FlexibilityNo cancel fee	On-time75%
Delta	Cheapest$726	Average$945	FlexibilityNo cancel fee	On-timeN/A
Air Canada	Cheapest$728	Average$983	FlexibilityNo cancel fee	On-time67%
Lufthansa	Cheapest$734	Average$1,076	FlexibilityNo cancel fee	On-time76%

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$258+ Cheap flights from St. Louis (STL) to London (LON)

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to London with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in April or November, booked 26 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

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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 April 30, 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 April 30, 2025.

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Use the filters below to find and compare flights from St. Louis to London that are best for you.

Compare providers for flights from St. Louis to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to London in April.

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

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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 round-trip flight from St. Louis to London. Price data was last updated on April 25, 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 April 30, 2025.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

Reviews of airlines servicing London

Read reviews from past customers who have flown Delta, Finnair and United Airlines from St. Louis to London. 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.

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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 April 30, 2025.