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

According to our current data, Iberia ($690), British Airways ($691), and Delta ($696) offers the cheapest pricing from St. Louis to London. These flights start at 24% 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 Aer Lingus, with whom users have recently found tickets for as low as $443. However, be on the lookout for offers from KLM 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 $51 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 25% 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 $613.

Most accurate provider : When it comes to deals on St. Louis-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-London flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

$172+ Flights from St. Louis to London

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

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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

Cheap flight deals from St. Louis to London

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$690 (Iberia)
One-way from	$172 (Kiwi.com)
Popular in	June
Cheapest in	April
Average price	$815

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. 17% potential increase in price ($188 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 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 March 26, 2025.

Tue 9/231:30 pmSTL - LHR

2 stops20h 30mScandinavian Airlines

Tue 9/306:40 amLHR - STL

2 stops22h 59mScandinavian Airlines

Deal found 3/26

$687

Fri 4/1111:21 amSTL - LHR

1 stop13h 04mIberia

Thu 4/173:30 pmLHR - STL

1 stop14h 03mIberia

Deal found 3/24

$690

Tue 5/131:38 pmSTL - LHR

1 stop16h 37mBritish Airways

Tue 5/205:20 pmLHR - STL

2 stops31h 13mBritish Airways

Deal found 3/24

$691

Sat 10/114:30 pmSTL - LHR

1 stop35h 10mUnited Airlines

Tue 10/215:40 pmLHR - STL

1 stop31h 53mUnited Airlines

Deal found 3/24

$692

Tue 10/1411:51 amSTL - LHR

1 stop12h 54mDelta

Wed 10/228:40 amLHR - STL

2 stops18h 07mDelta

Deal found 3/25

$694

Tue 8/261:30 pmSTL - LHR

1 stop11h 00mAir Canada

Fri 9/56:00 amLHR - STL

2 stops19h 57mAir Canada

Deal found 3/24

$698

Tue 5/65:47 pmSTL - LGW

1 stop34h 13mMultiple Airlines

Mon 5/122:00 pmLGW - STL

1 stop16h 06mMultiple Airlines

Deal found 3/25

$702

Thu 11/204:15 pmSTL - LHR

2 stops32h 55mMultiple Airlines

Wed 11/261:30 pmLHR - STL

2 stops31h 56mMultiple Airlines

Deal found 3/25

$703

Mon 8/259:50 amSTL - LCY

2 stops26h 35mBritish Airways

Thu 9/47:05 pmLCY - STL

2 stops29h 16mBritish Airways

Deal found 3/25

$751

Sun 11/95:18 pmSTL - LHR

2 stops16h 32mLufthansa

Sat 11/157:30 pmLHR - STL

1 stop24h 25mLufthansa

Deal found 3/24

$788

Sat 5/175:00 pmSTL - LHR

1 stop31h 45mVirgin Atlantic

Thu 6/129:20 amLHR - STL

1 stop13h 02mVirgin Atlantic

Deal found 3/26

$819

Wed 4/2311:06 amSTL - LHR

1 stop21h 19mFinnair

Wed 4/3010:20 amLHR - STL

2 stops17h 52mFinnair

Deal found 3/25

$858

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 March 26, 2025.

Fri 4/1111:21 amSTL - LHR

1 stop13h 04mIberia

Thu 4/173:30 pmLHR - STL

1 stop14h 03mIberia

Deal found 3/24

$690

Tue 5/131:38 pmSTL - LHR

1 stop16h 37mBritish Airways

Tue 5/205:20 pmLHR - STL

2 stops31h 13mBritish Airways

Deal found 3/24

$691

Tue 5/132:15 pmSTL - LHR

2 stops16h 55mDelta

Tue 5/208:40 amLHR - STL

2 stops17h 59mDelta

Deal found 3/24

$696

Tue 8/261:30 pmSTL - LHR

1 stop11h 00mAir Canada

Fri 9/56:00 amLHR - STL

2 stops19h 57mAir Canada

Deal found 3/24

$698

Tue 5/65:47 pmSTL - LGW

1 stop34h 13mMultiple Airlines

Mon 5/122:00 pmLGW - STL

1 stop16h 06mMultiple Airlines

Deal found 3/25

$702

Thu 5/81:30 pmSTL - LHR

1 stop14h 30mUnited Airlines

Thu 5/156:30 amLHR - STL

2 stops15h 17mUnited Airlines

Deal found 3/24

$713

Mon 8/253:30 pmSTL - LHR

2 stops20h 10mScandinavian Airlines

Thu 9/49:05 pmLHR - STL

3 stops29h 42mScandinavian Airlines

Deal found 3/26

$785

Thu 9/45:30 pmSTL - LHR

2 stops17h 10mLufthansa

Sat 9/136:30 amLHR - STL

2 stops19h 09mLufthansa

Deal found 3/24

$805

Sat 5/175:00 pmSTL - LHR

1 stop31h 45mVirgin Atlantic

Thu 6/129:20 amLHR - STL

1 stop13h 02mVirgin Atlantic

Deal found 3/26

$819

Wed 4/2311:06 amSTL - LHR

1 stop21h 19mFinnair

Wed 4/3010:20 amLHR - STL

2 stops17h 52mFinnair

Deal found 3/25

$858

Wed 4/2310:17 amSTL - LHR

2 stops15h 43mAer Lingus

Wed 4/301:25 pmLHR - STL

2 stops16h 08mAer Lingus

Deal found 3/24

$898

Fri 8/157:42 amSTL - LGW

2 stops18h 28mAmerican Airlines

Fri 8/2212:20 pmLGW - STL

2 stops17h 02mAmerican Airlines

Deal found 3/25

$898

Last-minute flights from St. Louis to London
Discover last-minute flight deals from St. Louis to London. Data last updated March 26, 2025 and is based on user searches.

Wed 4/28:00 amSTL - LGW

2 stops26h 00mTurkish Airlines

Wed 4/2310:55 amLGW - STL

2 stops33h 47mTurkish Airlines

Deal found 3/25

$1,428

Wed 4/23:30 pmSTL - LHR

1 stop12h 10mLufthansa

Wed 4/236:30 amLHR - STL

1 stop13h 00mLufthansa

Deal found 3/25

$1,463

Thu 4/34:57 pmSTL - LGW

1 stop35h 03mMultiple Airlines

Thu 4/102:00 pmLGW - STL

1 stop15h 46mMultiple Airlines

Deal found 3/25

$742

Thu 4/32:05 pmSTL - LHR

2 stops15h 05mAer Lingus

Tue 4/87:40 amLHR - STL

2 stops16h 22mAer Lingus

Deal found 3/24

$909

Thu 4/31:43 pmSTL - LHR

1 stop13h 57mUnited Airlines

Tue 4/82:05 pmLHR - STL

2 stops28h 15mUnited Airlines

Deal found 3/24

$960

Thu 4/33:30 pmSTL - LHR

1 stop14h 20mMultiple Airlines

Mon 4/77:30 pmLHR - STL

2 stops26h 17mMultiple Airlines

Deal found 3/24

$989

Thu 4/35:55 amSTL - LCY

2 stops33h 15mBritish Airways

Mon 4/77:00 pmLCY - STL

2 stops31h 58mBritish Airways

Deal found 3/24

$1,011

Thu 4/31:48 pmSTL - LHR

2 stops14h 27mDelta

Mon 4/711:45 amLHR - STL

2 stops17h 44mDelta

Deal found 3/24

$1,023

Thu 4/36:29 pmSTL - LHR

1 stop10h 01mFinnair

Thu 4/1010:20 amLHR - STL

2 stops17h 52mFinnair

Deal found 3/25

$1,512

Thu 4/34:26 pmSTL - LHR

1 stop12h 04mBritish Airways

Tue 4/89:15 amLHR - STL

1 stop13h 00mBritish Airways

Deal found 3/25

$1,541

Thu 4/39:39 amSTL - LCY

2 stops16h 31mMultiple Airlines

Thu 4/108:45 amLCY - STL

2 stops17h 19mMultiple Airlines

Deal found 3/25

$1,585

Thu 4/33:30 pmSTL - STN

2 stops16h 50mMultiple Airlines

Mon 4/76:25 amSTN - STL

2 stops14h 24mMultiple Airlines

Deal found 3/24

$1,692

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 March 26, 2025.

Tue 4/84:57 pmSTL - LGW

1 stop35h 03mMultiple Airlines

Deal found 3/25

$172

Tue 4/812:15 pmSTL - LHR

3 stops17h 40mMultiple Airlines

Deal found 3/25

$413

Mon 4/2112:00 pmSTL - LHR

2 stops14h 00mAer Lingus

Deal found 3/24

$443

Mon 4/217:01 pmSTL - LHR

1 stop12h 29mKLM

Deal found 3/24

$451

Thu 5/81:30 pmSTL - LHR

1 stop14h 30mAir Canada

Deal found 3/25

$464

Thu 5/87:10 amSTL - LGW

2 stops17h 25mAmerican Airlines

Deal found 3/25

$469

Mon 4/2110:30 amSTL - LCY

2 stops15h 40mDelta

Deal found 3/24

$489

Mon 4/2112:15 pmSTL - STN

3 stops36h 25mMultiple Airlines

Deal found 3/24

$510

Tue 4/84:57 pmSTL - LTN

3 stops37h 53mMultiple Airlines

Deal found 3/25

$515

Tue 4/82:03 pmSTL - LHR

1 stop10h 37mBritish Airways

Deal found 3/25

$516

Mon 4/2112:15 pmSTL - LCY

3 stops24h 20mMultiple Airlines

Deal found 3/25

$529

Wed 5/1410:05 amSTL - LHR

2 stops16h 50mDelta

Deal found 3/25

$529

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

Fri 4/11

11:21 am-6:25 am

1 stop13h 04m

London Heathrow

Thu 4/17

3:30 pm-11:33 pm

1 stop14h 03m

$690

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/13

1:38 pm-12:15 pm

1 stop16h 37m

London Heathrow

Tue 5/20

5:20 pm-6:33 pm

2 stops31h 13m

$691

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/13

2:15 pm-1:10 pm

2 stops16h 55m

London Heathrow

Tue 5/20

8:40 am-8:39 pm

2 stops17h 59m

$696

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/26

1:30 pm-6:30 am

1 stop11h 00m

London Heathrow

Fri 9/5

6:00 am-7:57 pm

2 stops19h 57m

$698

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Tue 5/6

5:47 pm-10:00 am

1 stop34h 13m

London Gatwick

Mon 5/12

2:00 pm-12:06 am

1 stop16h 06m

$702

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 5/8

1:30 pm-10:00 am

1 stop14h 30m

London Heathrow

Thu 5/15

6:30 am-3:47 pm

2 stops15h 17m

$713

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/20

7:30 am-6:35 am

1 stop17h 05m

London Heathrow

Mon 6/2

10:30 am-7:58 pm

2 stops15h 28m

$719

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 8/25

3:30 pm-5:40 pm

2 stops20h 10m

London Heathrow

Thu 9/4

9:05 pm-8:47 pm

3 stops29h 42m

$785

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 9/4

5:30 pm-4:40 pm

2 stops17h 10m

London Heathrow

Sat 9/13

6:30 am-7:39 pm

2 stops19h 09m

$805

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 5/17

5:00 pm-6:45 am

1 stop31h 45m

London Heathrow

Thu 6/12

9:20 am-4:22 pm

1 stop13h 02m

$819

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 48 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 March.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Gotogate	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
ScholarTrip	Price Accuracy3 stars	Trust Score*3 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-London flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 $1,115). 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

7,891 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

7,891 reviews

Delta

8.0

Very good

7,891 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

1,319 reviews

Delta

8.0

Very good

7,891 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

1,266 reviews

Delta

8.0

Very good

7,891 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.

Air France

7.4

Good

1,423 reviews

Delta

8.0

Very good

7,891 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

8,608 reviews

Delta

8.0

Very good

7,891 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 ($690), British Airways ($691), and Delta ($696) offers the cheapest pricing from St. Louis to London. These flights start at 24% 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 Aer Lingus, with whom users have recently found tickets for as low as $443. However, be on the lookout for offers from KLM 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 $51 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 $1,115). 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

Hounslow

Hayes

Thornton Heath

Luton

Wembley

Harrow

Horley

Canterbury

Gatwick

Dover

Orpington

Watford

Milton Keynes

Croydon

Borehamwood

Bromley

Folkestone

Ilford

Aylesbury

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$948	FlexibilityNo cancel fee	On-time71%
Scandinavian Airlines	Cheapest$669	Average$1,102	FlexibilityNo cancel fee	On-time77%
Iberia	Cheapest$671	Average$912	FlexibilityNo cancel fee	On-time77%
British Airways	Cheapest$697	Average$962	FlexibilityNo cancel fee	On-time70%
Virgin Atlantic	Cheapest$703	Average$913	FlexibilityNo cancel fee	On-time72%
Delta	Cheapest$713	Average$919	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$718	Average$945	FlexibilityNo cancel fee	On-time69%
KLM	Cheapest$726	Average$896	FlexibilityNo cancel fee	On-time75%
Air Canada	Cheapest$728	Average$936	FlexibilityNo cancel fee	On-time67%
Lufthansa	Cheapest$734	Average$1,085	FlexibilityNo cancel fee	On-time76%

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$172+ 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 4/8. 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 March 26, 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 March 26, 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 March 21, 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 March 26, 2025.

Rainfall in London by month

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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 March 26, 2025.