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Cheap flights from London to St. Louis from £204

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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — STL
31 Mar — 7 Apr1
1 adult

Cheapflights Tip: The best prices from London to Lambert-St Louis are usually found in March or January, booked 13 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap flight deals from London to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 26 March 2025.

Round-trip from

£604

One-way from

£204

Popular in

December

Cheapest in

March

Average price

£571
United Airlines
  • United Airlines
  • 9/5-23/5
  • 4 total stops
  • 41h 44m total
  • London to St. Louis
4/5
  • 4/5
  • 1 total stop
  • 16h 06m total
  • London to St. Louis
Highest demand for flights based on searches. 5% potential increase in price (£33 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease (£25 potential savings vs. average return price).
Average for round-trip flights in March 2025

Find flight deals from London to St. Louis

Cheapest flights from London to St. Louis
Explore the most affordable flight options available from London to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 March 2025.

Fri 9/517:40LHR - STL
2 stops28h 09mUnited Airlines
Fri 23/513:00STL - LHR
1 stop11h 55mUnited Airlines
Deal found 25/3£604
Thu 8/508:45LCY - STL
3 stops33h 00mMultiple Airlines
Sun 11/512:15STL - LCY
3 stops24h 20mMultiple Airlines
Deal found 25/3£608
Thu 10/414:00LGW - STL
1 stop15h 46mMultiple Airlines
Mon 14/416:57STL - LGW
1 stop35h 03mMultiple Airlines
Deal found 25/3£620
Mon 28/408:30LHR - STL
2 stops33h 15mMultiple Airlines
Tue 13/512:15STL - LHR
2 stops14h 05mMultiple Airlines
Deal found 25/3£638
Tue 22/419:30LHR - STL
2 stops31h 28mFinnair
Tue 29/409:52STL - LHR
1 stop15h 28mFinnair
Deal found 24/3£655
Wed 2/410:05LHR - STL
1 stop16h 36mBritish Airways
Wed 9/410:17STL - LHR
1 stop14h 33mBritish Airways
Deal found 25/3£680
Fri 2/506:30LHR - STL
1 stop13h 00mLufthansa
Sat 17/517:29STL - LHR
1 stop12h 16mLufthansa
Deal found 25/3£739
Wed 18/612:30LHR - STL
1 stop13h 49mIberia
Thu 26/608:35STL - LHR
1 stop19h 55mIberia
Deal found 25/3£744
Sat 3/509:30LHR - STL
2 stops16h 05mAir Canada
Sat 10/513:30STL - LHR
2 stops25h 30mAir Canada
Deal found 25/3£765
Mon 28/406:30LHR - STL
2 stops16h 17mDelta
Tue 13/517:40STL - LHR
1 stop11h 30mDelta
Deal found 25/3£770
Wed 11/614:10LHR - STL
2 stops25h 29mWestJet
Wed 18/606:00STL - LHR
2 stops48h 05mWestJet
Deal found 25/3£775
Wed 11/608:30STN - STL
2 stops17h 13mMultiple Airlines
Wed 18/607:30STL - STN
2 stops30h 30mMultiple Airlines
Deal found 25/3£797

Cheapflights Fare Finder

Customise your flight search to find flights from London to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 26 March 2025.
Use the filters below to find and compare flights from London to St. Louis that are best for you.

Fly from

London

Fly to

St. Louis

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 9/5

17:40-15:49

2 stops28h 09m

Lambert-St Louis

Fri 23/5

13:00-06:55

1 stop11h 55m

£604

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 8/5

08:45-11:45

3 stops33h 00m

Lambert-St Louis

Sun 11/5

12:15-18:35

3 stops24h 20m

£608

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 10/4

14:00-23:46

1 stop15h 46m

Lambert-St Louis

Mon 14/4

16:57-10:00

1 stop35h 03m

£620

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 28/4

08:30-11:45

2 stops33h 15m

Lambert-St Louis

Tue 13/5

12:15-08:20

2 stops14h 05m

£638

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 22/4

19:30-20:58

2 stops31h 28m

Lambert-St Louis

Tue 29/4

09:52-07:20

1 stop15h 28m

£655

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 2/5

06:30-13:30

1 stop13h 00m

Lambert-St Louis

Sat 17/5

17:29-11:45

1 stop12h 16m

£739

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/6

12:30-20:19

1 stop13h 49m

Lambert-St Louis

Thu 26/6

08:35-10:30

1 stop19h 55m

£744

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 5/5

15:30-23:51

1 stop14h 21m

Lambert-St Louis

Mon 12/5

19:19-14:25

1 stop13h 06m

£751

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 3/5

09:30-19:35

2 stops16h 05m

Lambert-St Louis

Sat 10/5

13:30-21:00

2 stops25h 30m

£765

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 28/4

06:30-16:47

2 stops16h 17m

Lambert-St Louis

Tue 13/5

17:40-11:10

1 stop11h 30m

£770

Flights are sorted by cheapest return flights first.

Deals found on 25/3

Showing 1-10 of 45 results
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Best time to book a flight from London to St. Louis

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

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

Use this chart to determine the optimal time to book a return flight from London to St. Louis. Price data was last updated on 21 March 2025.

To ensure you get the cheapest price possible for a flight from London to St. Louis, you should look to book at least 13 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, February is the cheapest month in which you can book a flight from London to St. Louis (average of £722). Flying from London to St. Louis in December is currently the most expensive (average of £1,033). 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 LON to STL?

Find hourly flight availability from London to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 26 March 2025.

It’s typically best to fly out from London to St. Louis in the evening. Doing so could potentially save you 16% on the flight price compared to flying in the morning, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly return from London to St. Louis. Price data was last updated on 30 June 2024.

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

Rainfall in St. Louis by month

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

In terms of precipitation, rainfall in St. Louis ranges from 56.0 - 119.0 inches per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Louis when rainfall is around 56.0 mm.

Temperature in St. Louis by month

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

If weather is an important factor for your trip to St. Louis, 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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated 26 March 2025.
Get a feel of what it's like to fly with Delta, KLM and Finnair from London to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Comfort

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
8.0
Very Good

Comfort

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Comfort

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Comfort

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Comfort

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Comfort

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from London to St. Louis. 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 into for flights to St. Louis from London?

    Lambert-St Louis (STL) is the airport you will fly into if you book a flight from London to St. Louis. You should not have trouble finding flights to Lambert-St Louis from London; the airport handles an average of 0 inbound flights from London per day. You should also have plenty of airline options to choose from since 7 airlines have flights to the St. Louis airport from London. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.

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

    Our cheapest airline available from London to St. Louis is United Airlines. Our recent data shows that you can find tickets from as low as £604 on this airline. Additional options worth looking into are Finnair and Lufthansa, starting at £655 and £739 round-trip. These flights start at 15% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at £533. Aer Lingus flights start at £680 while deals on British Airways start at £694 one-way.

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

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

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

    Grant Park, Magnificent Mile, and North Pier Apartments are currently the most popular points of interest in Chicago at the moment. Grant Park, Magnificent Mile, and North Pier Apartments are located about 16.2 mi, 15.5 mi, and 16.1 mi, respectively from Chicago O'Hare Intl. Travellers in need of a car in Chicago can hire one for about £39 per day.

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

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London to St. Louis 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 London to St. Louis?

    Currently, February is the cheapest month in which you can book a flight from London to St. Louis (average of £722). Flying from London to St. Louis in December is currently the most expensive (average of £1,033). 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

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Fly from London to St. Louis on these airlines

Choose from the following airlines for your flight from London to St. Louis. Flights are based on user searches made on Cheapflights and were last updated on 26 March 2025.

Top 7 airlines flying from London to St. Louis

Discover the top 7 airlines that operate flights from London to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 26 March 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£521Average£666FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IberiaCheapest£621Average£739FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£645Average£840FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£658Average£851FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£662Average£928FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£702Average£916FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Air CanadaCheapest£728Average£891FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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

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

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

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from London to St. Louis flexibly with Cheapflights today.

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

Not ready to book yet? You can track prices for flights from London to St. Louis on Cheapflights with our Price Alert feature and get notified when better prices are available.

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