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Finnair flights from London to St. Louis (LON - STL)

LON — STL
17 Aug — 24 Aug1
1 adult
1 adult, Economy, 0 bags

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Cheapest Finnair flights from London to St. Louis
Explore the most affordable Finnair flight options available from London to St. Louis. Find the lowest fares with prices last updated on 18 July 2026.

Sat 22/812:55
LHR
-
STL
1 stop13h 31m
Finnair
Sat 5/912:45
STL
-
LHR
1 stop14h 15m
Finnair
Deal found 17/7£760
Fri 28/816:25
LHR
-
STL
Nonstop9h 05m
Finnair
Sun 13/921:40
STL
-
LHR
Nonstop8h 00m
Finnair
Deal found 16/7£817
Fri 21/809:45
LHR
-
STL
1 stop20h 29m
Finnair
Sun 30/816:54
STL
-
LHR
1 stop33h 11m
Finnair
Deal found 17/7£888

  • How do most travelers feel about Finnair?

    The general consensus from 1,420 Cheapflights users is that Finnair is a 7.6/10. Select your travel dates above for updated prices on flights from London to St. Louis (LON-STL).

  • Can I get a flight from London to St. Louis on Finnair for under £892?

    There are 8 flights available on Finnair from London to St. Louis for under £892. These prices can change based on many factors including date and time. To find LON-STL flight prices for your dates, click here.

Finnair flights from London to St. Louis in 2026

Find detailed information about Finnair flights from London to St. Louis. Explore the options provided by Finnair to plan your journey from London to St. Louis. Data last updated 18 July 2026.

One-way from

£643

Return from

£637

Popular in

July

Cheapest in

February

Average price (all airlines)

£890
Finnair
  • Finnair
  • 1/9
  • Nonstop
  • 9h 05m total
  • London to St. Louis
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Finnair
  • Finnair
  • 15/9-29/9
  • 1 total stop
  • 24h 12m total
  • London to St. Louis
Search Deals
Highest demand for flights from London to Lambert-St Louis; 14% potential price increase.
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Best time to find cheap flights from London to Lambert-St Louis; 1% potential price drop.
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Average price for all London to Lambert-St Louis flights (one-way and round-trip).
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Which month is the cheapest to fly Economy class from London to St. Louis?

For Economy class flights, the cheapest month to fly this route is March. The most expensive months are July and June.

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).

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.

Browse thousands of different options on Cheapflights for your next trip

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Fly from London to St. Louis on another airline

Consider alternative airlines that service the St. Louis area. Flight routes are based on user searches made on Cheapflights and were last updated on 18 July 2026.
British Airways flights from London to Lambert-St Louis
Virgin Atlantic flights from London to Lambert-St Louis

See what others are saying about Finnair

Read reviews and see what other travellers are saying about their experiences with Finnair. Get insights from real passengers regarding the airline's services, customer satisfaction, and overall travel experience. Use these reviews to inform your decision when choosing Finnair for your next flight. Reviews last updated 18 July 2026.
Finnair
7.6
Good
1,420 reviews
Check prices
Overview

Boarding

7.7

Entertainment

6.9

Food

6.7

Crew

8.2

Comfort

7.4

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