Cheap Flights from London Heathrow to Seattle / Tacoma International

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Travellers and cabin class, 1 Adult, Economy

Compare London Heathrow to Seattle / Tacoma International flight deals

Find the cheapest month or even day of the year to fly to Seattle / Tacoma International

Book the best Seattle / Tacoma International fare with no extra fees

Flight deals Cheapest month Find the best route Route info FAQs Tips and advice

Flight deals from London Heathrow to Seattle / Tacoma International

Looking for a cheap last-minute deal or the best return flight from London Heathrow Airport to Seattle / Tacoma International Airport? If you want to travel next month, return fares start from R 7,155. Find the lowest prices on one-way and return tickets right here.

Seattle.R 6,716 per passenger.Departing Tue, 3 Nov.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 3 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 6,716, select.

Seattle.R 6,846 per passenger.Departing Mon, 15 Feb.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 15 Feb, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 6,846, select.

Seattle.R 7,040 per passenger.Departing Mon, 7 Jun.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 7 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,040, select.

Seattle.R 7,082 per passenger.Departing Wed, 31 Mar.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Wed, 31 Mar, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,082, select.

Seattle.R 7,138 per passenger.Departing Wed, 7 Apr.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Wed, 7 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,138, select.

Seattle.R 7,176 per passenger.Departing Tue, 19 Jan.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 19 Jan, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,176, select.

Seattle.R 7,179 per passenger.Departing Mon, 7 Dec.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 7 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,179, select.

Seattle.R 7,236 per passenger.Departing Mon, 24 May.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 24 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,236, select.

Seattle.R 7,296 per passenger.Departing Tue, 20 Oct.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 20 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,296, select.

Seattle.R 7,457 per passenger.Departing Wed, 23 Sep.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Wed, 23 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,457, select.

Seattle.R 7,758 per passenger.Departing Mon, 5 Jul.One-way flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Mon, 5 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,758, select.

Seattle.R 7,808 per passenger.Departing Wed, 25 Aug.One-way flight with Lufthansa.Outbound indirect flight with Lufthansa, departs from London Heathrow on Wed, 25 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 7,808, select.

Seattle.R 8,026 per passenger.Departing Tue, 20 Oct.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from London Heathrow on Tue, 20 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 8,026, select.

Seattle.R 8,033 per passenger.Departing Mon, 28 Dec.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from London Heathrow on Mon, 28 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 8,033, select.

Seattle.R 8,102 per passenger.Departing Fri, 13 Nov.One-way flight with Finnair.Outbound direct flight with Finnair departs from London Heathrow on Fri, 13 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 8,102, select.

Seattle.R 8,223 per passenger.Departing Sat, 10 Jul.One-way flight with Finnair.Outbound direct flight with Finnair departs from London Heathrow on Sat, 10 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 8,223, select.

Find the cheapest month to fly from London Heathrow to Seattle / Tacoma International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London Heathrow to Seattle / Tacoma International flights are currently cheapest in November.

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Direct flights from London Heathrow to Seattle / Tacoma International

London Heathrow to Seattle / Tacoma International: Alternative routes

Compare routes from London Heathrow to Seattle below. You may find an airport to fly into that's cheaper, faster, or easier than Seattle / Tacoma International.

London to Seattle: Flight information

The things to know before you go.

Cheapest flight found	R 6,716
Cheapest month to fly	November
Average flight time	10 hrs, 14 mins
Most popular airline	Alaska Airlines
Average flights per week	166

Finding cheap flights from London Heathrow to Seattle / Tacoma International: Frequently asked questions

How much are return flights from London Heathrow to Seattle / Tacoma International?

The best price we found for a return flight from London Heathrow to Seattle / Tacoma International is R 6,480. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from London Heathrow to Seattle / Tacoma International?

10 hours and 14 minutes is the average flight time from London Heathrow to Seattle / Tacoma International.

Which airlines fly direct from London Heathrow to Seattle / Tacoma International?

Alaska Airlines, Iberia and British Airways fly direct from London Heathrow to Seattle / Tacoma International.

How many flights are there a week from London Heathrow to Seattle / Tacoma International?

As of September 2026, there are 166 flights per week flying from London Heathrow to Seattle / Tacoma International.

When is the cheapest time to fly from London Heathrow to Seattle / Tacoma International?

The cheapest month to fly from London Heathrow to Seattle / Tacoma International is usually January.

Which upcoming date is cheapest to fly from London Heathrow Airport to Seattle / Tacoma International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Seattle / Tacoma International Airport on Monday, 25 January 2027.

Can I get a direct flight from London Heathrow Airport to Seattle / Tacoma International Airport?

Yes – the average flight time is 10 hours and 14 minutes.

How can I find the best flight deal to Seattle / Tacoma International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle / Tacoma International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Seattle?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from London Heathrow Airport to Seattle / Tacoma International with?

Currently, Icelandair and Virgin Atlantic offer the cheapest flight tickets to Seattle / Tacoma International.

Travelling from London Heathrow Airport (LHR) to Seattle / Tacoma International Airport (SEA): what you need to know

Around 10 hours 5 minutes is how long you'll be travelling on a direct flight from London Heathrow Airport to Seattle / Tacoma International Airport.
Seattle's timezone is UTC-8, which makes Seattle eight hours behind London.
There are 31 London Heathrow Airport to Seattle / Tacoma International Airport flights each week.
Give yourself enough time to make your LHR to SEA flight. As a general rule, arrive at least two hours before international departures and an hour ahead for domestic flights.
Be prepared for longer lines during popular months such as July. Arriving up to four hours in advance for international flights and two hours for a domestic departure is a good idea.
You'll find a range of airlines offering direct flights from London Heathrow Airport to Seattle / Tacoma International Airport. When you're ready to kick off your Seattle adventure, let one of these carriers transport you to this unmissable part of the United States:
British Airways tops the list for bookings on this route.
With a dependable 91.84% of services arriving as scheduled, Delta has the best on-time performance for LHR to SEA flights.
If you want to split up your journey, just uncheck 'Direct flights only' when searching for your ticket from London Heathrow Airport to Seattle / Tacoma International Airport. Here are the top stopovers between LHR and SEA:
- Paris Charles de Gaulle Airport
- Vancouver International Airport
- Reykjavik Keflavik Airport

How to find the cheapest flights from London Heathrow Airport (LHR) to Seattle / Tacoma International Airport (SEA)

R 6,716 is currently the lowest price for a one-way London Heathrow Airport to Seattle / Tacoma International Airport flight. Return flights start at R 6,480. These prices may change depending on demand and availability.
To pick up cheap tickets from LHR to SEA, book ahead. Airlines typically offer lower fares when flights are first made available.
May is the cheapest month for flights from London Heathrow Airport to Seattle / Tacoma International Airport. If you're looking to fly at a different time of year, the 'Whole month' tool will give you the lowest prices across every month.
There's no need to check every day to see if fares have gone down when you create a Price Alert. We'll let you know as soon as the price changes on cheap flights from LHR to SEA.
Secure the ideal flight for you by using the filters. To see the 'Cheapest,' 'Best' or 'Fastest' flights from London Heathrow Airport to Seattle / Tacoma International Airport, use the 'Sort by' tool. You can also filter by airline, arrival and departure times, and journey duration.

Handy information about London Heathrow Airport (LHR)

78% of flights that depart London Heathrow Airport touch down at their destination on schedule.
London Heathrow Airport is about 24 kilometres from central London. If you're driving, ride-sharing or catching a taxi from the centre, it'll take you 45 minutes or so to arrive, depending on the traffic.
Expect a journey time of roughly 25 minutes on public transport.
Need a handy hotel close to LHR? If you're boarding an early flight from London Heathrow Airport to Seattle / Tacoma International Airport, these accommodation options will put you moments from your departure gate:

Arriving at Seattle / Tacoma International Airport (SEA)

The last thing you need is a long journey to your hotel if you're arriving on a late London Heathrow Airport to Seattle / Tacoma International Airport flight. Reserve one of these accommodation options near SEA instead:
Grab a Seattle / Tacoma International Airport rental car and discover Seattle and beyond with your own set of wheels. Thrifty, Europcar and Budget are top outlets to choose from here.
Reserving your vehicle from Seattle / Tacoma International Airport about one week in advance increases your chances of getting a good deal.

Getting from Seattle / Tacoma International Airport (SEA) to central Seattle

Seattle / Tacoma International Airport to central Seattle has a drive time of around 25 minutes. It's approximately 23 kilometres away.
It takes roughly 35 minutes to get there using public transport.

When to fly to Seattle / Tacoma International Airport (SEA)

The quietest month for a flight from London Heathrow Airport to Seattle / Tacoma International Airport is March, while July is the most popular. Pick the ideal time to visit Seattle based on whether you prefer a faster pace or a more relaxed vibe.
Lock in your flight from London Heathrow Airport to Seattle / Tacoma International Airport for August if you'd like to go to Seattle during its warmest month. Expect temperatures of between 12ºC (54ºF) and 28ºC (82ºF).
Search for cheap tickets from LHR to SEA in February if you like cooler conditions. Temperatures are at their lowest around then, ranging between -1ºC (30ºF) and 11ºC (52ºF) on average.

Explore more of the United States

You've visited Seattle, now it's time to discover other corners of the United States. Travel around 241 kilometres south to Portland to tick off its leading attractions. From Portland Japanese Garden to Peninsula Park Rose Garden and Beyond Van Gogh Portland, you've got a jam-packed schedule ahead.
Spokane is another must-experience destination in the United States and is around 370 kilometres east of Seattle. No journey is complete without seeing Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes.