Is KLM the cheapest airline to fly with from London to Seattle?

With an average price of £781 return, KLM is not the cheapest airline to fly from London to Seattle with. Instead, for the lowest price, our data suggests flying with Lufthansa, where a return flight costs £658 on average.

What is the cheapest KLM flight from London to Seattle?

In the last 3 days, the lowest price for a flight with KLM from London to Seattle was £626 for a return flight and £721 for a one-way flight.

Does KLM fly direct to Seattle from London?

Yes, KLM does offer direct flights for the route, with around 12 flights per week.

What’s the cheapest day of the week to fly from London to Seattle with KLM?

On average, the cheapest day of the week to fly from London to Seattle with KLM is Tuesday, when prices are around £686. The most expensive day is generally Friday, when the average price is around £790.

What’s the cheapest month to fly from London to Seattle with KLM?

The cheapest month for KLM flights to Seattle from London is generally May, where plane tickets cost £714 on average. If possible, try to avoid the most expensive months of July and April, when tickets cost £1,274 and £1,528 respectively.

£451 Cheap KLM Flights from London to Seattle

LON - SEA

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Cheap KLM Flight Deals from London to Seattle

Here are some of the best deals found on KAYAK recently from KLM for return flights from London to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Round-trip

One-way

Last minute

Direct

Recent return KLM flight deals from London to Seattle

KAYAK's recommended return flight KLM deals departing in the coming months from London to Seattle.

Discover the best prices for you by selecting your travel dates on KAYAK.

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06:30 - 11:40LHR-SEA

13h 10m1 stop

17:35 - 11:20SEA-LHR

9h 45mdirect

£451KLM

Find Deal

Mon, 5 May - Mon, 19 May

06:30 - 11:40LHR-SEA

13h 10m1 stop

17:35 - 11:20SEA-LHR

9h 45mdirect

£502KLM

Find Deal

Sun, 4 May - Mon, 19 May

09:50 - 15:57LCY-SEA

14h 07m1 stop

18:07 - 16:40SEA-LCY

14h 33m1 stop

£503KLM

Find Deal

Mon, 5 May - Mon, 19 May

06:30 - 11:40LHR-SEA

13h 10m1 stop

17:35 - 11:20SEA-LHR

9h 45mdirect

£545KLM

Find Deal

Mon, 2 Jun - Mon, 16 Jun

09:20 - 16:05LCY-SEA

14h 45m1 stop

13:55 - 11:40SEA-LCY

13h 45m1 stop

£555KLM

Find Deal

Mon, 8 Sep - Fri, 26 Sep

20:55 - 11:40LHR-SEA

22h 45m1 stop

20:25 - 14:15SEA-LHR

9h 50mdirect

£557KLM

Find Deal

Sun, 8 Jun - Sun, 15 Jun

09:20 - 16:05LCY-SEA

14h 45m1 stop

13:55 - 11:40SEA-LCY

13h 45m1 stop

£558KLM

Find Deal

Mon, 8 Sep - Fri, 26 Sep

06:30 - 11:40LHR-SEA

13h 10m1 stop

17:35 - 11:20SEA-LHR

9h 45mdirect

£575KLM

Find Deal

Fri, 6 Jun - Mon, 9 Jun

13:25 - 15:45LHR-SEA

10h 20mdirect

20:25 - 14:15SEA-LHR

9h 50mdirect

£585KLM

Find Deal

Fri, 6 Jun - Mon, 9 Jun

09:20 - 16:05LCY-SEA

14h 45m1 stop

17:40 - 16:40SEA-LCY

15h 00m1 stop

£589KLM

Find Deal

Fri, 19 Sep - Sun, 21 Sep

Low season	January
High season	July
Cheapest flight	£451
Average price round-trip	£533

Best time to beat the crowds (18% less expensive on average)

Most popular time to fly (32% more expensive on average)

Flight from London Heathrow Airport to Seattle

(price for this month)

When to Book Flights with KLM from London to Seattle

Average price per month

Flight prices as travel date approaches

Is KLM the cheapest airline to fly with from London to Seattle?
With an average price of £781 return, KLM is not the cheapest airline to fly from London to Seattle with. Instead, for the lowest price, our data suggests flying with Lufthansa, where a return flight costs £658 on average.
What is the cheapest KLM flight from London to Seattle?
In the last 3 days, the lowest price for a flight with KLM from London to Seattle was £626 for a return flight and £721 for a one-way flight.
Does KLM fly direct to Seattle from London?
Yes, KLM does offer direct flights for the route, with around 12 flights per week.
What’s the cheapest day of the week to fly from London to Seattle with KLM?
On average, the cheapest day of the week to fly from London to Seattle with KLM is Tuesday, when prices are around £686. The most expensive day is generally Friday, when the average price is around £790.
What’s the cheapest month to fly from London to Seattle with KLM?
The cheapest month for KLM flights to Seattle from London is generally May, where plane tickets cost £714 on average. If possible, try to avoid the most expensive months of July and April, when tickets cost £1,274 and £1,528 respectively.

See more FAQs

7.8

GoodBased on 1,333 verified guest reviews

8.4Crew

7.2Food

7.7Comfort

7.8Boarding

7.1Entertainment

Pros +

Seats were very comfortable. (in 6 reviews)

Cons -

This is by far the best airlines I have used. (in 1 review)
When I boarded a man sat it my seat. (in 47 reviews)

Show reviews that mention

8.0 Very Good

Shereen, Apr 2025

AMS-YUL

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

8.0 Very Good

Verified traveller, Apr 2025

AMS-MAN

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

10.0 Wonderful

Verified traveller, Apr 2025

INL-AMS

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

8.0 Very Good

Verified traveller, Apr 2025

AMS-INL

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

6.0 Okay

Paul, Mar 2025

BOM-MLE

This portion of the flight was through Indigo. A local carrier. So all economy seating. No real service some refreshments for purchase standard economy stuff.

8.0 Very Good

John, Mar 2025

EZE-AMS

You should not have to pay for WiFi in business class

10.0 Wonderful

Verified traveller, Mar 2025

AMS-BOM

Transfer at Amsterdam airport is very convenient and the airport is easy to navigate. Boarding was also quick and easy. Cabin crew were excellent and the meals were good, although lacking in options.

10.0 Wonderful

Verified traveller, Mar 2025

SFO-AMS

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

8.0 Very Good

Verified traveller, Mar 2025

BOS-DCA

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

8.0 Very Good

Verified traveller, Mar 2025

AMS-BOS

I flew premium economy and this was a good option. Although the seats didn’t recline much, I was able to get some sleep with my head propped against the window. The food was good and the entertainment was wonderful The staff were very attentive and professional

Everything you need to know for your flight from London to Seattle

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LON - SEA

£451 Find Cheap KLM Flights from London to Seattle

Search hundreds of travel sites at once for deals on KLM flights from London to Seattle

Cheap KLM Flight Deals from London to Seattle

Recent return KLM flight deals from London to Seattle

Recent one-way KLM flight deals from London to Seattle

Recent last minute KLM flight deals from London to Seattle

Recent direct KLM flight deals from London to Seattle

Good to know

Low season

High season

Cheapest flight

Average price round-trip

When to Book Flights with KLM from London to Seattle

FAQs for flying to Seattle with KLM

Is KLM the cheapest airline to fly with from London to Seattle?

What is the cheapest KLM flight from London to Seattle?

Does KLM fly direct to Seattle from London?

What’s the cheapest day of the week to fly from London to Seattle with KLM?

What’s the cheapest month to fly from London to Seattle with KLM?

KLM Customer Reviews

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Cons -

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Everything you need to know for your flight from London to Seattle

Other airlines flying from London to Seattle

Flight deals from the most popular airlines with KAYAK users flying the route

Cabin class types available on flights to Seattle

Cabin classes available on flights to London. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.

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The most popular destinations for flights with KLM according to clicks from KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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