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

A quick flight from St. Louis to London can take about 8h 05m. United Airlines provides one of the quickest options available for as low as $667. St. Louis and London are separated by a distance of 4186 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

According to our current data, KLM ($529), Air Canada ($573), and Delta ($577) offers the cheapest pricing from St. Louis to London. These flights start at 40% 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 British Airways, with whom users have recently found tickets for as low as $397. However, be on the lookout for offers from Delta and American Airlines, as they are both options that can get you from St. Louis to London for a low price.

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.

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).

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 cheapest flights from St. Louis to London?

The cheapest flight price from St. Louis to London is $278. On average you can expect to pay $762. The most popular route, (Lambert-St Louis - London Heathrow), can usually be booked for $604.

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 British Airways, American Airlines or United Airlines as they are the most popular for this route.

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

$186+ Flights from St. Louis to London

Q: How much does it cost to fly round-trip from St. Louis to London?

Airfare is below average for this route at the moment. St. Louis to London flights typically cost between $704 and $1,301 in April. The cheapest round-trip price found within the last 3 days was $655 on United Airlines (Apr 13-May 1).

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

Cheap 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 December 18, 2025.

Sun 12/288:01 pmSTL - LHR

1 stop32h 24mBritish Airways

Wed 1/77:25 pmLHR - STL

2 stops33h 19mBritish Airways

Deal found 12/17

$957

Wed 12/246:35 pmSTL - LHR

1 stop10h 40mLufthansa

Sun 12/286:30 amLHR - STL

1 stop13h 25mLufthansa

Deal found 12/17

$1,111

Sat 12/276:35 pmSTL - LHR

1 stop32h 40mBritish Airways

Tue 1/63:05 pmLHR - STL

2 stops37h 39mBritish Airways

Deal found 12/17

$1,149

Tue 12/233:30 pmSTL - LHR

1 stop33h 20mBritish Airways

Mon 12/295:45 pmLHR - STL

2 stops33h 06mBritish Airways

Deal found 12/16

$1,151

Fri 12/262:04 pmSTL - LHR

1 stop13h 11mBritish Airways

Tue 12/302:45 pmLHR - STL

1 stop15h 10mBritish Airways

Deal found 12/15

$1,167

Thu 12/186:35 pmSTL - LHR

1 stop10h 40mLufthansa

Thu 1/158:30 amLHR - STL

2 stops20h 28mLufthansa

Deal found 12/16

$1,183

Thu 12/1811:51 amSTL - LGW

2 stops40h 09mMultiple Airlines

Thu 1/152:00 pmLGW - STL

1 stop14h 34mMultiple Airlines

Deal found 12/16

$1,195

Mon 12/2210:40 amSTL - LGW

1 stop17h 20mMultiple Airlines

Mon 12/292:00 pmLGW - STL

2 stops25h 40mMultiple Airlines

Deal found 12/16

$1,441

Sat 12/277:02 pmSTL - LCY

2 stops30h 13mKLM

Tue 1/65:05 pmLCY - STL

2 stops29h 40mKLM

Deal found 12/17

$1,461

Wed 12/244:27 pmSTL - LGW

1 stop35h 33mMultiple Airlines

Wed 12/311:00 pmLGW - STL

2 stops26h 40mMultiple Airlines

Deal found 12/16

$1,471

Sat 12/274:27 pmSTL - LGW

1 stop35h 33mMultiple Airlines

Tue 1/61:00 pmLGW - STL

2 stops39h 33mMultiple Airlines

Deal found 12/17

$1,476

Tue 12/304:05 pmSTL - LCY

2 stops35h 00mMultiple Airlines

Mon 1/59:50 amLCY - STL

2 stops35h 39mMultiple Airlines

Deal found 12/17

$1,498

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 December 18, 2025.

Mon 3/235:55 pmSTL - LHR

1 stop34h 45mUnited Airlines

Thu 4/25:40 pmLHR - STL

1 stop27h 44mUnited Airlines

Deal found 12/15

$666

Sun 4/2610:00 pmSTL - LHR

Nonstop8h 05mFinnair

Wed 5/64:25 pmLHR - STL

Nonstop9h 05mFinnair

Deal found 12/17

$667

Tue 4/216:35 pmSTL - LCY

2 stops17h 20mLufthansa

Tue 4/289:15 amLCY - STL

2 stops19h 44mLufthansa

Deal found 12/17

$671

Wed 1/145:11 pmSTL - LGW

1 stop34h 49mMultiple Airlines

Wed 1/211:00 pmLGW - STL

2 stops40h 33mMultiple Airlines

Deal found 12/17

$706

Tue 5/121:30 pmSTL - LHR

2 stops14h 45mDelta

Sun 5/176:30 amLHR - STL

2 stops16h 15mDelta

Deal found 12/17

$708

Tue 1/63:54 pmSTL - LCY

2 stops44h 36mBritish Airways

Sun 1/116:55 pmLCY - STL

2 stops33h 49mBritish Airways

Deal found 12/16

$823

Tue 4/217:45 amSTL - STN

2 stops27h 05mTurkish Airlines

Tue 4/285:45 pmSTN - STL

2 stops33h 18mTurkish Airlines

Deal found 12/17

$1,144

Tue 4/146:02 pmSTL - LHR

1 stop33h 38mUnited Airlines

Tue 4/282:10 pmLHR - STL

1 stop31h 14mUnited Airlines

Deal found 12/16

$666

Tue 3/316:35 pmSTL - LCY

2 stops17h 20mLufthansa

Wed 4/89:15 amLCY - STL

2 stops19h 44mLufthansa

Deal found 12/17

$671

Sun 4/192:18 pmSTL - LHR

2 stops14h 27mDelta

Sun 4/268:40 amLHR - STL

2 stops18h 09mDelta

Deal found 12/16

$713

Wed 2/1111:20 amSTL - LHR

1 stop14h 35mUnited Airlines

Wed 2/1812:00 pmLHR - STL

2 stops15h 05mUnited Airlines

Deal found 12/17

$666

Wed 2/184:05 pmSTL - LCY

2 stops14h 50mMultiple Airlines

Wed 3/189:50 amLCY - STL

2 stops34h 39mMultiple Airlines

Deal found 12/17

$739

Wed 2/1111:22 amSTL - LCY

2 stops15h 43mLufthansa

Tue 2/179:50 amLCY - STL

2 stops20h 15mLufthansa

Deal found 12/16

$694

Tue 3/244:47 pmSTL - LHR

1 stop12h 28mUnited Airlines

Thu 4/28:30 amLHR - STL

1 stop12h 54mUnited Airlines

Deal found 12/17

$678

Tue 3/241:00 pmSTL - LCY

2 stops13h 15mDelta

Mon 3/308:25 amLCY - STL

2 stops18h 45mDelta

Deal found 12/17

$818

Wed 4/223:30 pmSTL - LCY

1 stop20h 25mLufthansa

Mon 4/279:15 amLCY - STL

2 stops19h 44mLufthansa

Deal found 12/17

$760

Thu 3/267:52 amSTL - LGW

1 stop21h 08mMultiple Airlines

Thu 4/22:00 pmLGW - STL

1 stop14h 33mMultiple Airlines

Deal found 12/17

$839

Fri 3/274:05 pmSTL - LHR

1 stop11h 25mUnited Airlines

Fri 4/36:30 amLHR - STL

1 stop13h 00mUnited Airlines

Deal found 12/17

$707

Mon 3/238:10 pmSTL - LGW

1 stop32h 50mMultiple Airlines

Wed 4/12:00 pmLGW - STL

1 stop14h 33mMultiple Airlines

Deal found 12/17

$843

Thu 3/264:05 pmSTL - LHR

1 stop11h 25mUnited Airlines

Fri 4/36:30 amLHR - STL

1 stop13h 00mUnited Airlines

Deal found 12/17

$707

Sun 4/193:30 pmSTL - LCY

1 stop20h 25mLufthansa

Tue 4/286:30 pmLCY - STL

1 stop24h 55mLufthansa

Deal found 12/17

$778

Thu 3/267:52 amSTL - LGW

1 stop21h 08mMultiple Airlines

Wed 4/12:00 pmLGW - STL

1 stop14h 33mMultiple Airlines

Deal found 12/17

$844

Thu 3/264:05 pmSTL - LHR

1 stop11h 25mUnited Airlines

Wed 4/16:30 amLHR - STL

1 stop13h 00mUnited Airlines

Deal found 12/17

$707

Sun 5/176:49 pmSTL - LCY

2 stops17h 06mLufthansa

Fri 5/299:15 amLCY - STL

2 stops17h 49mLufthansa

Deal found 12/16

$809

Mon 2/910:16 amSTL - LGW

1 stop17h 44mMultiple Airlines

Fri 2/132:00 pmLGW - STL

2 stops22h 51mMultiple Airlines

Deal found 12/15

$857

Fri 1/304:49 pmSTL - LHR

1 stop12h 26mUnited Airlines

Fri 2/611:35 amLHR - STL

1 stop15h 23mUnited Airlines

Deal found 12/16

$716

Thu 4/97:45 amSTL - STN

2 stops27h 05mTurkish Airlines

Sat 4/185:45 pmSTN - STL

2 stops33h 18mTurkish Airlines

Deal found 12/16

$1,333

Sun 5/176:49 pmSTL - LCY

2 stops17h 46mLufthansa

Thu 6/49:15 amLCY - STL

2 stops19h 29mLufthansa

Deal found 12/15

$865

Thu 3/267:52 amSTL - LGW

1 stop21h 08mMultiple Airlines

Tue 3/312:00 pmLGW - STL

1 stop15h 19mMultiple Airlines

Deal found 12/17

$887

Sun 5/176:49 pmSTL - LCY

2 stops17h 46mLufthansa

Wed 6/39:15 amLCY - STL

2 stops17h 49mLufthansa

Deal found 12/15

$865

Last-minute flights from St. Louis to London
Discover last-minute flight deals from St. Louis to London. Data last updated December 18, 2025 and is based on user searches.

Wed 1/73:11 pmSTL - LHR

2 stops14h 09mMultiple Airlines

Wed 1/141:25 pmLHR - STL

2 stops32h 04mMultiple Airlines

Deal found 12/17

$672

Thu 1/1512:44 pmSTL - LHR

1 stop16h 06mLufthansa

Mon 1/268:15 pmLHR - STL

2 stops27h 28mLufthansa

Deal found 12/16

$661

Sun 1/184:05 pmSTL - LHR

2 stops22h 30mMultiple Airlines

Wed 4/16:30 amLHR - STL

1 stop12h 55mMultiple Airlines

Deal found 12/16

$657

Sun 1/1810:19 amSTL - LHR

2 stops15h 46mDelta

Wed 4/16:30 amLHR - STL

2 stops14h 08mDelta

Deal found 12/17

$658

Sun 1/1811:20 amSTL - LHR

2 stops13h 50mUnited Airlines

Wed 4/18:30 amLHR - STL

2 stops15h 21mUnited Airlines

Deal found 12/16

$668

Fri 1/231:15 pmSTL - LHR

1 stop10h 40mLufthansa

Mon 1/266:30 pmLHR - STL

2 stops29h 13mLufthansa

Deal found 12/16

$680

Wed 1/281:15 pmSTL - LHR

1 stop10h 40mLufthansa

Mon 2/21:35 pmLHR - STL

1 stop15h 23mLufthansa

Deal found 12/16

$677

Fri 1/303:50 pmSTL - LHR

1 stop19h 55mLufthansa

Fri 2/68:30 amLHR - STL

2 stops20h 28mLufthansa

Deal found 12/16

$675

Fri 1/308:13 amSTL - LGW

2 stops17h 17mAmerican Airlines

Fri 2/611:20 amLGW - STL

2 stops18h 39mAmerican Airlines

Deal found 12/16

$679

Fri 1/304:05 pmSTL - LHR

1 stop10h 25mMultiple Airlines

Fri 2/611:10 amLHR - STL

2 stops18h 49mMultiple Airlines

Deal found 12/15

$685

Fri 1/309:57 amSTL - LHR

1 stop13h 58mUnited Airlines

Tue 2/36:50 amLHR - STL

2 stops22h 08mUnited Airlines

Deal found 12/15

$687

Fri 1/309:59 amSTL - LHR

2 stops16h 46mDelta

Fri 2/66:30 amLHR - STL

2 stops17h 20mDelta

Deal found 12/16

$693

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 December 18, 2025.

Mon 2/210:16 amSTL - LGW

1 stop17h 44mMultiple Airlines

Deal found 12/17

$186

Sun 2/15:42 pmSTL - LGW

1 stop34h 18mMultiple Airlines

Deal found 12/17

$211

Sat 1/318:22 pmSTL - LGW

2 stops51h 38mMultiple Airlines

Deal found 12/17

$236

Mon 2/28:22 pmSTL - LHR

2 stops34h 28mMultiple Airlines

Deal found 12/17

$258

Sat 1/318:22 pmSTL - LHR

3 stops34h 28mMultiple Airlines

Deal found 12/17

$274

Sun 2/19:32 pmSTL - LHR

3 stops57h 18mMultiple Airlines

Deal found 12/17

$278

Fri 1/167:27 pmSTL - LHR

3 stops35h 23mMultiple Airlines

Deal found 12/17

$313

Sun 2/15:42 pmSTL - STN

3 stops55h 33mMultiple Airlines

Deal found 12/17

$314

Sat 1/318:22 pmSTL - STN

3 stops39h 13mMultiple Airlines

Deal found 12/17

$315

Mon 2/25:42 pmSTL - STN

3 stops55h 48mMultiple Airlines

Deal found 12/17

$320

Sat 1/3112:12 pmSTL - LTN

3 stops41h 48mMultiple Airlines

Deal found 12/17

$325

Mon 2/25:42 pmSTL - LTN

3 stops46h 43mMultiple Airlines

Deal found 12/17

$331

Find flight deals from St. Louis to London

Most accurate provider	Justfly.com 3 stars
Most trusted provider	Justfly.com 3 stars
Round-trip from	$655 (United Airlines)
One-way from	$186 (Trip.com)
Popular in	June
Cheapest in	November
Average price	$1,049
Good round-trip deal	$662 or less
Good one-way deal	$280 or less

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. 24% potential increase in price ($284 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($41 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Price to beat on a round-trip flight from Lambert-St Louis to London (LON).

Search Deals

Price to beat on a one-way flight from Lambert-St Louis to London (LON).

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/23

5:55 pm-9:40 am

1 stop34h 45m

London Heathrow

Thu 4/2

5:40 pm-3:24 pm

1 stop27h 44m

$666

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 4/14

6:02 pm-9:40 am

1 stop33h 38m

London Heathrow

Tue 4/28

2:10 pm-3:24 pm

1 stop31h 14m

$666

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 2/11

11:20 am-7:55 am

1 stop14h 35m

London Heathrow

Wed 2/18

12:00 pm-9:05 pm

2 stops15h 05m

$666

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 4/26

10:00 pm-12:05 pm

Nonstop8h 05m

London Heathrow

Wed 5/6

4:25 pm-7:30 pm

Nonstop9h 05m

$667

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Tue 4/21

6:35 pm-5:55 pm

2 stops17h 20m

London City

Tue 4/28

9:15 am-10:59 pm

2 stops19h 44m

$671

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Tue 3/31

6:35 pm-5:55 pm

2 stops17h 20m

London City

Wed 4/8

9:15 am-10:59 pm

2 stops19h 44m

$671

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 3/24

4:47 pm-10:15 am

1 stop12h 28m

London Heathrow

Thu 4/2

8:30 am-3:24 pm

1 stop12h 54m

$678

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 2/11

11:22 am-9:05 am

2 stops15h 43m

London City

Tue 2/17

9:50 am-12:05 am

2 stops20h 15m

$694

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 1/14

5:11 pm-10:00 am

1 stop34h 49m

London Gatwick

Wed 1/21

1:00 pm-11:33 pm

2 stops40h 33m

$706

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 3/27

4:05 pm-8:30 am

1 stop11h 25m

London Heathrow

Fri 4/3

6:30 am-1:30 pm

1 stop13h 00m

$707

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 60 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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy2 stars	Trust Score*3 stars
Ovago	Price Accuracy2 stars	Trust Score*2 stars
oojo	Price Accuracy3 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
Justfly.com	Price Accuracy3 stars	Trust Score*3 stars
Gurufare	Price Accuracy2 stars	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 Justfly.com to be most consistent on Cheapflights vs. Justfly.com Users can find the same prices on St. Louis-London flight deals on Cheapflights vs. Justfly.com >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 Justfly.com the most. Justfly.com 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 25 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, September is the cheapest month in which you can book a flight from St. Louis to London (average of $530). Flying from St. Louis to London in June is currently the most expensive (average of $1,001). 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 evening. By choosing this option you can save up to 32% on the cost of your flight, compared to a flight at noon.

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 Sunday evenings 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.

How much does it cost to fly round-trip from St. Louis to London?

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

Chicago (ORD) – chosen by Cheapflights users on 55% of 1-stop itineraries from St. Louis to London on Cheapflights.

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

Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of $782.

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

Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 9h 55m.

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

Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 16m.

Reviews of airlines servicing London

Read reviews from past customers who have flown United Airlines, American Airlines, and Air Canada from St. Louis to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

United Airlines

7.4

Good

9,091 reviews

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

American Airlines

7.2

Good

11,054 reviews

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

Air Canada

7.1

Good

10,534 reviews

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

Iberia

7.0

Good

3,050 reviews

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

British Airways

6.7

Okay

7,585 reviews

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

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.
How long is the flight from St. Louis to London?
A quick flight from St. Louis to London can take about 8h 05m. United Airlines provides one of the quickest options available for as low as $667. St. Louis and London are separated by a distance of 4186 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines flying from St. Louis to London round-trip?
According to our current data, KLM ($529), Air Canada ($573), and Delta ($577) offers the cheapest pricing from St. Louis to London. These flights start at 40% 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 British Airways, with whom users have recently found tickets for as low as $397. However, be on the lookout for offers from Delta and American Airlines, 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.
What are the cheapest flights from St. Louis to London?
The cheapest flight price from St. Louis to London is $278. On average you can expect to pay $762. The most popular route, (Lambert-St Louis - London Heathrow), can usually be booked for $604.
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, September is the cheapest month in which you can book a flight from St. Louis to London (average of $530). Flying from St. Louis to London in June is currently the most expensive (average of $1,001). 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.

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Top 10 airlines flying from St. Louis to London

Airline	Cheapest	Average	Flexibility	On-time
KLM	Cheapest$529	Average$736	FlexibilityNo cancel fee	On-time75%
Air Canada	Cheapest$573	Average$945	FlexibilityNo cancel fee	On-time67%
Delta	Cheapest$577	Average$870	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$580	Average$870	FlexibilityNo cancel fee	On-time69%
British Airways	Cheapest$580	Average$862	FlexibilityNo cancel fee	On-time70%
Iberia	Cheapest$597	Average$977	FlexibilityNo cancel fee	On-time77%
Scandinavian Airlines	Cheapest$602	Average$987	FlexibilityNo cancel fee	On-time77%
American Airlines	Cheapest$610	Average$846	FlexibilityNo cancel fee	On-time71%
Lufthansa	Cheapest$670	Average$898	FlexibilityNo cancel fee	On-time76%
Virgin Atlantic	Cheapest$736	Average$947	FlexibilityNo cancel fee	On-time72%

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$186+ 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 2/2. 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 November or October, booked 81 days in advance, depart on a Saturday or Monday and return on a Wednesday

Cheap 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 December 18, 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 December 18, 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.

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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 December 12, 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 December 18, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to London. Price data was last updated on December 16, 2024.

How much does it cost to fly round-trip from St. Louis to London?

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

Share of 1-stop round-trip flights from St. Louis to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

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

Average round-trip fare for 1-stop flights from St. Louis to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

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

Shortest average travel time for 1-stop one-way flights from St. Louis to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

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

Average layover duration for 1-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 reviews from past customers who have flown United Airlines, American Airlines, and Air Canada from St. Louis to London. Users can see the overall rating for each airline as well as how each is rated in terms of 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 cheapest airlines to fly from St. Louis to London one-way?

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

What are the cheapest flights 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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Alternative routes for 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 December 18, 2025.