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Find cheap KLM flights to Seattle

CMH — SEA
26 Aug — 2 Sep1
1 adult
1 adult, Economy, 0 bags

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Cheapest KLM flights from United Kingdom to Seattle
Explore the most affordable KLM flight options available from United Kingdom to Seattle. Find the lowest fares with prices last updated on 27 July 2026.

Wed 26/811:45
LHR
-
SEA
1 stop12h 42m
KLM
Mon 7/917:30
SEA
-
LHR
Nonstop9h 50m
KLM
Deal found 25/7£547
Thu 27/806:30
LHR
-
SEA
1 stop13h 07m
KLM
Tue 8/917:30
SEA
-
LHR
Nonstop9h 50m
KLM
Deal found 25/7£549
Fri 28/817:45
LHR
-
SEA
Nonstop10h 18m
KLM
Mon 14/921:50
SEA
-
LHR
Nonstop9h 45m
KLM
Deal found 26/7£560

Flights to Seattle with KLM at a glance

Find detailed information about KLM flights from United Kingdom to Seattle. Explore the options provided by KLM to plan your journey from United Kingdom to Seattle. Data last updated 27 July 2026.

Popular in

July

Cheapest in

January

Average price

£590

Return from

£518

One-way from

£701
Highest demand for flights to Seattle with KLM; 9% potential price increase.
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Best time to find cheap flights to Seattle with KLM; 1% potential price drop.
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Average price for flights to Seattle with KLM (return).
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KLM
  • KLM
  • 4/9-19/9
  • 1 total stop
  • 23h 02m total
  • United Kingdom to Seattle
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KLM
  • KLM
  • 4/8
  • Nonstop
  • 10h 20m total
  • United Kingdom to Seattle
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Cheapflights Insights

Find cheap KLM flights to Seattle

How long is the flight to Seattle with KLM?

On average, KLM flights from the United Kingdom to Seattle take 12 hours 7 minutes. Flights to Seattle from other popular cities in the United Kingdom will vary in length. Below are a few examples of popular routes and their flight times.

KLM weekly flight availability to Seattle

The most flights to Seattle operated by KLM are scheduled on a Friday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (3 on average).

When is the best time to book a flight to Seattle with KLM?

The best time to book a flight to Seattle with KLM is 52 days before departure. On average, fares are higher if you book 39 days before departure.

FAQs about flights to Seattle with KLM

  • Which airport do KLM flights arrive at when travelling to Seattle?

    KLM flights on this route tend to land at Seattle/Tacoma Intl Airport.

  • Is KLM the cheapest airline for a flight to Seattle?

    Flight prices will depend on factors like date, time, and cabin class, so it is worth comparing flights before booking. Based on Cheapflights data, the cheapest average return price for flights to Seattle tends to be with Air Canada.

  • Are there alternative airlines other than KLM that fly to Seattle?

    Virgin Atlantic, British Airways and Icelandair all fly to Seattle and offer an alternative to KLM.

  • How much is a KLM flight to Seattle?

    The average price for a return flight with KLM is £694, while a one-way flight costs around £696.

See more FAQs

Reviews of KLM

See what Cheapflights users have to say about their KLM experience.
KLM
7.8
Good
1,550 reviews
Check prices
Overview

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

7.7

Entertainment

7.2

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