Cheap flights from Seattle to London Heathrow

Q: What are the cheapest airlines?

Air Canada, Delta Air Lines, Icelandair, Lufthansa, Virgin Atlantic. These airlines usually offer the cheapest flights from Seattle to London Heathrow.

Q: Can I fly direct to London Heathrow?

Delta Air Lines, Virgin Atlantic, KLM, Iberia Airlines. You can fly non-stop from Seattle to London Heathrow with these airlines.

Q: What airlines fly indirectly?

Air Canada, British Airways, Lufthansa, Icelandair. These airlines fly from Seattle to London Heathrow, but you’ll have at least one layover.

Q: How long is the flight?

9 hrs 25 mins. This is the shortest flight time from Seattle to London Heathrow.

from as little as £511

7 nights in London, departing Seattle on 23 / Jan / 2025 with Icelandair (price found 42 hours ago)

Subject to availability, prices correct of the last 24 hours

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Cheap return flights from Seattle to London Heathrow

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The Seattle / London Heathrow route

All 7692 km of it

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London Heathrow flight facts

What you need to know

What are the cheapest airlines?

Air Canada
Delta Air Lines
Icelandair
Lufthansa
Virgin Atlantic

These airlines usually offer the cheapest flights from Seattle to London Heathrow.

Can I fly direct to London Heathrow?

Delta Air Lines
Virgin Atlantic
KLM
Iberia Airlines

You can fly non-stop from Seattle to London Heathrow with these airlines.

What airlines fly indirectly?

Air Canada
British Airways
Lufthansa
Icelandair

These airlines fly from Seattle to London Heathrow, but you’ll have at least one layover.

How long is the flight?

9 hrs 25 mins

This is the shortest flight time from Seattle to London Heathrow.

Alternative flights from the UK to London Heathrow

Check out prices for other routes

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23 / Jan / 2025 is currently the lowest priced day of the year to fly the Seattle/London Heathrow route. There are around 31 flights on any given week from the UK to London Heathrow and the cheapest month to fly right now is January.

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

Min / Max Temperature (°C)

LOWEST

2 °C

AVG

11 °C

HIGHEST

24 °C

Rainfall (mm)

LOWEST

38.1 mm

AVG

52.5 mm

HIGHEST

66 mm

Key facts about London Heathrow

Currency

British pound

Language

English

Timezone

0 hrs behind GMT

How to get cheap flights from Seattle to London Heathrow

Tips and advice from our flight experts

If you want a cheap flight from Seattle to London, you've got eight airlines to choose from. You can use the search box to filter your preferences, but we've found that the cheapest day to fly is 23 / Jan / 2025.

You can use the filters on your search to see more flights and find cheaper rates – London has more than one airport. So if you don't need to fly into London Heathrow, it's worth checking your other options. The 7692 km flight usually takes about 11 hrs 55 mins.

There are about 31 flights to or via London every week, so you have plenty of options. Keep your eye out for flights with Air Canada, British Airways and Delta Air Lines – these are the most popular airlines for flying to .

During this peak season, hotel and holiday prices often increase too, so it's best to book early. Or you could keep your fingers crossed and hold out for a last-minute deal.