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

According to our current data, Delta ($708), United Airlines ($711), and Virgin Atlantic ($727) offers the cheapest pricing from St. Louis to London. These flights start at 22% 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 Iberia, with whom users have recently found tickets for as low as $463. However, be on the lookout for offers from Aer Lingus and Air Canada, 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.

Where are the most common layover locations when flying from St. Louis to London?

Flights departing from St. Louis and landing in London layover in Chicago most frequently.

Where are the least popular layover locations for St. Louis to London flights?

Flights departing from St. Louis and landing in London layover in Detroit least frequently.

What are some popular things to do or see while on a layover in Chicago?

Chicago travelers tend to visit Magnificent Mile, Grant Park, and River North more than anywhere else. Magnificent Mile, Grant Park, and River North are located about 15.5 mi, 16.2 mi, and 15.0 mi, respectively from Chicago O'Hare Intl. Travelers can rent a car at Chicago O'Hare Intl for an average daily rate of $53 to make sightseeing during their layover a little easier.

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.

$357+ Flights from St. Louis to London

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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	$704 (Air Canada)
One-way from	$369 (Kiwi.com)
Popular in	June
Cheapest in	April
Average price	$774

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

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

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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 ($168 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

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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 15, 2025.

Tue 10/149:15 amSTL - LHR

2 stops15h 15mAir Canada

Wed 10/222:05 pmLHR - STL

2 stops31h 11mAir Canada

Deal found 4/14

$703

Tue 5/132:30 pmSTL - LHR

2 stops13h 30mMultiple Airlines

Wed 6/410:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 4/14

$704

Wed 9/1711:51 amSTL - LHR

2 stops15h 04mDelta

Wed 9/248:40 amLHR - STL

2 stops17h 55mDelta

Deal found 4/14

$707

Mon 5/121:30 pmSTL - LHR

1 stop14h 30mUnited Airlines

Fri 5/236:30 amLHR - STL

1 stop13h 00mUnited Airlines

Deal found 4/14

$711

Tue 8/1911:51 amSTL - LHR

1 stop12h 54mKLM

Thu 8/281:05 pmLHR - STL

1 stop13h 42mKLM

Deal found 4/14

$715

Tue 9/92:42 pmSTL - LHR

1 stop11h 23mIberia

Mon 9/223:30 pmLHR - STL

1 stop14h 19mIberia

Deal found 4/14

$719

Wed 5/143:40 pmSTL - LHR

2 stops13h 45mVirgin Atlantic

Tue 6/179:20 amLHR - STL

1 stop12h 58mVirgin Atlantic

Deal found 4/14

$727

Mon 5/56:45 amSTL - LCY

2 stops27h 45mBritish Airways

Thu 5/157:05 pmLCY - STL

2 stops29h 16mBritish Airways

Deal found 4/14

$737

Thu 8/143:30 pmSTL - LHR

2 stops18h 30mScandinavian Airlines

Wed 8/206:40 amLHR - STL

2 stops22h 59mScandinavian Airlines

Deal found 4/14

$738

Mon 8/255:30 pmSTL - LHR

2 stops19h 10mLufthansa

Thu 9/46:30 amLHR - STL

2 stops15h 14mLufthansa

Deal found 4/13

$768

Sun 5/185:45 pmSTL - LGW

1 stop34h 15mMultiple Airlines

Sun 6/12:00 pmLGW - STL

1 stop15h 49mMultiple Airlines

Deal found 4/14

$789

Fri 5/23:29 pmSTL - LHR

1 stop9h 51mBritish Airways

Sun 5/119:15 amLHR - STL

1 stop12h 12mBritish Airways

Deal found 4/14

$791

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 15, 2025.

Tue 5/132:30 pmSTL - LHR

2 stops13h 30mMultiple Airlines

Wed 6/410:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 4/14

$704

Tue 5/136:05 pmSTL - LHR

1 stop13h 05mDelta

Thu 6/56:15 amLHR - STL

2 stops16h 45mDelta

Deal found 4/14

$708

Mon 5/121:30 pmSTL - LHR

1 stop14h 30mUnited Airlines

Fri 5/236:30 amLHR - STL

1 stop13h 00mUnited Airlines

Deal found 4/14

$711

Wed 5/143:40 pmSTL - LHR

2 stops13h 45mVirgin Atlantic

Tue 6/179:20 amLHR - STL

1 stop12h 58mVirgin Atlantic

Deal found 4/14

$727

Mon 5/56:45 amSTL - LCY

2 stops27h 45mBritish Airways

Thu 5/157:05 pmLCY - STL

2 stops29h 16mBritish Airways

Deal found 4/14

$737

Sat 4/263:30 pmSTL - LHR

2 stops33h 00mAir Canada

Sun 5/49:30 amLHR - STL

1 stop16h 28mAir Canada

Deal found 4/14

$749

Wed 5/147:30 pmSTL - LHR

1 stop10h 45mIberia

Sun 6/112:30 pmLHR - STL

1 stop14h 28mIberia

Deal found 4/14

$751

Tue 5/204:45 pmSTL - LHR

1 stop13h 35mLufthansa

Sun 6/1512:00 pmLHR - STL

1 stop15h 56mLufthansa

Deal found 4/14

$778

Wed 7/23:42 pmSTL - LHR

2 stops23h 58mScandinavian Airlines

Mon 7/146:40 amLHR - STL

2 stops22h 59mScandinavian Airlines

Deal found 4/14

$938

Mon 6/26:05 pmSTL - LHR

1 stop13h 05mKLM

Fri 6/1311:45 amLHR - STL

1 stop11h 22mKLM

Deal found 4/14

$998

Fri 4/186:00 pmSTL - LHR

1 stop10h 30mFinnair

Mon 4/212:25 pmLHR - STL

1 stop13h 47mFinnair

Deal found 4/13

$1,020

Mon 4/286:00 pmSTL - LHR

2 stops13h 25mAer Lingus

Thu 5/18:50 amLHR - STL

2 stops19h 22mAer Lingus

Deal found 4/14

$1,113

Last-minute flights from St. Louis to London
Discover last-minute flight deals from St. Louis to London. Data last updated April 15, 2025 and is based on user searches.

Sun 4/201:46 pmSTL - LHR

2 stops14h 59mDelta

Sun 4/276:30 amLHR - STL

2 stops16h 17mDelta

Deal found 4/14

$993

Wed 4/238:48 amSTL - LHR

1 stop21h 32mUnited Airlines

Sun 4/276:30 amLHR - STL

1 stop13h 00mUnited Airlines

Deal found 4/14

$736

Wed 4/236:00 pmSTL - LCY

2 stops45h 10mBritish Airways

Sun 4/277:00 pmLCY - STL

2 stops31h 58mBritish Airways

Deal found 4/14

$1,257

Wed 4/233:40 pmSTL - LGW

2 stops24h 40mTurkish Airlines

Sun 4/275:15 pmLGW - STL

2 stops51h 27mTurkish Airlines

Deal found 4/14

$2,201

Sat 4/263:30 pmSTL - LHR

2 stops33h 00mAir Canada

Sun 5/49:30 amLHR - STL

1 stop16h 28mAir Canada

Deal found 4/14

$749

Fri 5/23:29 pmSTL - LHR

1 stop9h 51mBritish Airways

Sun 5/119:15 amLHR - STL

1 stop12h 12mBritish Airways

Deal found 4/14

$791

Mon 5/56:45 amSTL - LCY

2 stops27h 45mBritish Airways

Thu 5/157:05 pmLCY - STL

2 stops29h 16mBritish Airways

Deal found 4/14

$737

Mon 5/121:30 pmSTL - LHR

1 stop14h 30mUnited Airlines

Fri 5/236:30 amLHR - STL

1 stop13h 00mUnited Airlines

Deal found 4/14

$711

Mon 5/121:30 pmSTL - LTN

2 stops27h 50mMultiple Airlines

Mon 5/194:00 pmLTN - STL

2 stops33h 58mMultiple Airlines

Deal found 4/14

$830

Mon 5/122:30 pmSTL - STN

2 stops15h 55mMultiple Airlines

Mon 5/196:45 amSTN - STL

2 stops19h 13mMultiple Airlines

Deal found 4/14

$993

Tue 5/132:30 pmSTL - LHR

2 stops13h 30mMultiple Airlines

Wed 6/410:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 4/14

$704

Tue 5/136:05 pmSTL - LHR

1 stop13h 05mDelta

Thu 6/56:15 amLHR - STL

2 stops16h 45mDelta

Deal found 4/14

$708

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 15, 2025.

Tue 5/272:40 pmSTL - STN

3 stops59h 05mMultiple Airlines

Deal found 4/13

$369

Tue 5/272:40 pmSTL - LHR

3 stops49h 50mMultiple Airlines

Deal found 4/13

$403

Sun 5/255:45 pmSTL - LGW

3 stops43h 35mMultiple Airlines

Deal found 4/13

$403

Sun 5/255:45 pmSTL - LTN

3 stops40h 15mMultiple Airlines

Deal found 4/13

$414

Tue 5/272:40 pmSTL - LCY

3 stops46h 40mMultiple Airlines

Deal found 4/13

$430

Wed 5/147:30 pmSTL - LHR

1 stop10h 45mIberia

Deal found 4/14

$463

Mon 5/196:00 amSTL - LHR

2 stops23h 10mAer Lingus

Deal found 4/14

$465

Wed 5/141:30 pmSTL - LHR

2 stops13h 05mAir Canada

Deal found 4/14

$474

Thu 5/83:43 pmSTL - LHR

1 stop10h 37mLufthansa

Deal found 4/13

$491

Wed 5/1411:32 amSTL - LCY

2 stops15h 18mDelta

Deal found 4/14

$519

Mon 5/196:00 amSTL - LCY

2 stops28h 30mBritish Airways

Deal found 4/14

$554

Mon 5/2611:32 amSTL - LHR

2 stops18h 33mWestJet

Deal found 4/13

$667

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 5/13

2:30 pm-10:00 am

2 stops13h 30m

London Heathrow

Wed 6/4

10:30 am-7:58 pm

2 stops15h 28m

$704

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/17

11:51 am-8:55 am

2 stops15h 04m

London Heathrow

Wed 9/24

8:40 am-8:35 pm

2 stops17h 55m

$707

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 5/12

1:30 pm-10:00 am

1 stop14h 30m

London Heathrow

Fri 5/23

6:30 am-1:30 pm

1 stop13h 00m

$711

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/19

11:51 am-6:45 am

1 stop12h 54m

London Heathrow

Thu 8/28

1:05 pm-8:47 pm

1 stop13h 42m

$715

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

2:42 pm-8:05 am

1 stop11h 23m

London Heathrow

Mon 9/22

3:30 pm-11:49 pm

1 stop14h 19m

$719

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/20

1:30 pm-8:35 am

2 stops13h 05m

London Heathrow

Thu 8/28

9:30 am-8:00 pm

1 stop16h 30m

$725

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 5/14

3:40 pm-11:25 am

2 stops13h 45m

London Heathrow

Tue 6/17

9:20 am-4:18 pm

1 stop12h 58m

$727

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Mon 5/5

6:45 am-4:30 pm

2 stops27h 45m

London City

Thu 5/15

7:05 pm-6:21 pm

2 stops29h 16m

$737

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 8/14

3:30 pm-4:00 pm

2 stops18h 30m

London Heathrow

Wed 8/20

6:40 am-11:39 pm

2 stops22h 59m

$738

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 8/25

5:30 pm-6:40 pm

2 stops19h 10m

London Heathrow

Thu 9/4

6:30 am-3:44 pm

2 stops15h 14m

$768

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

Showing 1-10 of 41 results

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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, KLM and Finnair 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

7,917 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

7,917 reviews

Delta

8.0

Very good

7,917 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.

KLM

7.8

Good

1,323 reviews

Delta

8.0

Very good

7,917 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

1,269 reviews

Delta

8.0

Very good

7,917 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

8,656 reviews

Delta

8.0

Very good

7,917 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.

Virgin Atlantic

7.4

Good

642 reviews

Delta

8.0

Very good

7,917 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, Delta ($708), United Airlines ($711), and Virgin Atlantic ($727) offers the cheapest pricing from St. Louis to London. These flights start at 22% 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 Iberia, with whom users have recently found tickets for as low as $463. However, be on the lookout for offers from Aer Lingus and Air Canada, 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.
Where are the most common layover locations when flying from St. Louis to London?
Flights departing from St. Louis and landing in London layover in Chicago most frequently.
What are some popular things to do or see while on a layover in Chicago?
Chicago travelers tend to visit Magnificent Mile, Grant Park, and River North more than anywhere else. Magnificent Mile, Grant Park, and River North are located about 15.5 mi, 16.2 mi, and 15.0 mi, respectively from Chicago O'Hare Intl. Travelers can rent a car at Chicago O'Hare Intl for an average daily rate of $53 to make sightseeing during their layover a little easier.
Where are the least popular layover locations for St. Louis to London flights?
Flights departing from St. Louis and landing in London layover in Detroit least frequently.
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

Wembley

Canterbury

Harrow

Dover

Gatwick

Orpington

Watford

Croydon

Borehamwood

Folkestone

Ilford

Aylesbury

Milton Keynes

Chelmsford

Sutton

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$952	FlexibilityNo cancel fee	On-time71%
Scandinavian Airlines	Cheapest$669	Average$1,102	FlexibilityNo cancel fee	On-time77%
Iberia	Cheapest$671	Average$933	FlexibilityNo cancel fee	On-time77%
British Airways	Cheapest$706	Average$981	FlexibilityNo cancel fee	On-time70%
Delta	Cheapest$713	Average$942	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$720	Average$965	FlexibilityNo cancel fee	On-time69%
KLM	Cheapest$726	Average$896	FlexibilityNo cancel fee	On-time75%
Virgin Atlantic	Cheapest$727	Average$915	FlexibilityNo cancel fee	On-time72%
Lufthansa	Cheapest$734	Average$1,076	FlexibilityNo cancel fee	On-time76%
Air Canada	Cheapest$740	Average$983	FlexibilityNo cancel fee	On-time67%

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$357+ 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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.

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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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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 15, 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 15, 2025.

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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.

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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.

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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 11, 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 15, 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, KLM and Finnair 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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Top 10 airlines flying from St. Louis to London

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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 15, 2025.