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Finnair flights from London to Washington, D.C. (LON - WAS)

LON — WAS
7 Dec — 14 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights users flying from London to Washington, D.C. on Finnair typically fly into Washington, D.C. Dulles Intl and depart from London Heathrow. Select your dates above for pricing.

Finnair flights from London to Washington, D.C. in 2025

Find detailed information about Finnair flights from London to Washington, D.C.. Explore the options provided by Finnair to plan your journey from London to Washington, D.C.. Data last updated 7 November 2025.

One-way from

£415

Return from

£472

Popular in

July

Cheapest in

February

Average price (all airlines)

£513
Finnair
  • Finnair
  • 21/1
  • Nonstop
  • 8h 30m total
  • London to Washington, D.C.
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Finnair
  • Finnair
  • 12/12-15/12
  • 1 total stop
  • 23h 25m total
  • London to Washington, D.C.
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Highest demand for flights from London to Washington, D.C.; 11% potential price increase.
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Best time to find cheap flights from London to Washington, D.C.; 2% potential price drop.
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Average price for all London to Washington, D.C. flights (one-way and round-trip).
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  • Can I get a flight from London to Washington, D.C. on Finnair for under £535?

    London to Washington, D.C. flights on Finnair are currently available under £535. 21 flights have been found by Cheapflights users under that amount. To find flights for your dates, click here.

  • Does Finnair service alternative airports for LON-WAS?

    If you’re flying LON-WAS on Finnair and are looking for alternative airports to fly into or out of, you are in luck. Instead of landing at Washington, D.C. Dulles Intl, there are routes available with Finnair that will take you to Baltimore/Washington. If you are looking for a closer or different airport to depart from in London, Finnair also flies out of London Gatwick when traveling to Washington, D.C..

  • How do most travelers feel about Finnair?

    1,335 Cheapflights users have left reviews for Finnair and have rated the airline 7.6/10. If you are looking to travel from London to Washington, D.C. on Finnair, input your dates in the form above for our best prices!

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Cheapest Finnair flights from London to Washington, D.C.
Explore the most affordable Finnair flight options available from London to Washington, D.C.. Find the lowest fares with prices last updated on 7 November 2025.

Fri 12/1216:25LHR - IAD
Nonstop8h 30mFinnair
Mon 15/1211:25IAD - LHR
1 stop14h 55mFinnair
Deal found 6/11£472
Wed 10/1212:10LHR - IAD
Nonstop8h 25mFinnair
Sun 14/1214:06IAD - LHR
1 stop12h 14mFinnair
Deal found 5/11£473
Fri 12/1212:35LHR - DCA
1 stop15h 24mFinnair
Mon 15/1219:48DCA - LHR
1 stop11h 12mFinnair
Deal found 6/11£476

Travel insights for Finnair flights from London to Washington, D.C.

Get recent, data-driven insights about Finnair flights from London to Washington, D.C. including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from London to Washington, D.C. with Finnair?

Currently, the most affordable month to book a Finnair flight from London to Washington, D.C. in April, with an average price of £416. Conversely, traveling with Finnair from London to Washington, D.C. in October will be the most expensive, with an average cost of £572. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. when rainfall is around 66.0 mm.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C., 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 2.0 C).

Best time to book a flight from London to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. 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.

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Fly from London to Washington, D.C. on another airline

Consider alternative airlines that service the Washington, D.C. area. Flight routes are based on user searches made on Cheapflights and were last updated on 7 November 2025.
Virgin Atlantic flights from London to Washington, D.C.
British Airways flights from London to Washington, D.C.

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 7 November 2025.
Finnair
7.6
Good
1,335 reviews
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Overview

Entertainment

6.9

Comfort

7.4

Food

6.7

Crew

8.1

Boarding

7.6

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