Cheap flights from London Heathrow to Seattle

from as little as £426

14 nights in Seattle, departing London Heathrow on 03 / Oct / 2025 with Icelandair (price found 33 hours ago)

Subject to availability, prices correct of the last 24 hours
Seattle

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The London Heathrow / Seattle route

All 7692 km of it

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Seattle flight facts

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Alternative flights from the UK to Seattle

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Seattle

Today alone, Netflights has searched over 15,357 flights. 03 / Oct / 2025 is currently the lowest priced day of the year to fly the London Heathrow/Seattle route. There are around 1,165 flights on any given week from the UK to Seattle and the cheapest month to fly right now is October.

Not suitable? Try running another search or viewing all cheap flight deals.

Min / Max Temperature (°C)
LOWEST

2 °C

AVG

12 °C

HIGHEST

25 °C

Rainfall (mm)
LOWEST

21 mm

AVG

81 mm

HIGHEST

170 mm

Key facts about Seattle

How to get cheap flights from London Heathrow to Seattle

Tips and advice from our flight experts

We've gone through lots of different flights, to help you find the cheapest way to get from London Heathrow to Seattle. You can choose from 15 airlines. At the moment, 03 / Oct / 2025 is the cheapest date to travel, but scroll through the results to find the option that works best for you.

The most popular airlines offering flights to Seattle are British Airways, Virgin Atlantic & Air Canada. British Airways is the most popular one, but that doesn’t mean their flights will be the cheapest. If you can't find a flight time that suits you, why not look at flying out from a different airport?

Generally speaking, the flight from London Heathrow to Seattle takes around 15 hrs 10 mins. The fastest flight takes 9 hrs 45 mins to cover the 7692 km distance. You can view all flight times yourself in the results list.

January is normally the cheapest month to fly to Seattle, but it’s important to try different options when you search. Searching by month, for instance, will show you the best time of the week to fly. August is always the most expensive time to fly but, if you check regularly and book early, you have a better chance of getting a good deal.

Other popular destinations near Seattle

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