Popular airlines from Seattle-Tacoma International Airport (SEA) to Heathrow Airport (LHR)
British AirwaysBritish Airways
LufthansaLufthansa
Air CanadaAir Canada
Alaska AirlinesAlaska Airlines
FinnairFinnair
Virgin AtlanticVirgin Atlantic
IcelandairIcelandair
Today's featured flight deals from Seattle-Tacoma International Airport (SEA) to Heathrow Airport (LHR)
- Seattle (SEA) to London (LHR).Delta, nonstop.Departing on Wed, Nov 5 at 4:48pm from Seattle, arriving on Thu, Nov 6 at 10:30am in London.Returning on Mon, Nov 10 at 8:25pm from London, arriving on Tue, Nov 11 at 11:45am in Seattle.Select Delta flight departing on Wed, Nov 5 at 4:48pm from Seattle, returning on Mon, Nov 10 at 8:25pm from London priced at $63030% less than typical$630
- Seattle (SEA) to London (LHR).British Airways, nonstop.Departing on Wed, Nov 12 at 6:50pm from Seattle, arriving on Thu, Nov 13 at 12:20pm in London.Returning on Sun, Nov 16 at 4:30pm from London, arriving on Mon, Nov 17 at 12:58am in Seattle.Select British Airways flight departing on Wed, Nov 12 at 6:50pm from Seattle, returning on Sun, Nov 16 at 4:30pm from London priced at $64530% less than typical$645
- Seattle (SEA) to London (LHR).Delta, nonstop.Departing on Sat, Nov 8 at 4:48pm from Seattle, arriving on Sun, Nov 9 at 10:30am in London.Returning on Sat, Nov 15 at 3:05pm from London, arriving at 5:10pm in Seattle.Select Delta flight departing on Sat, Nov 8 at 4:48pm from Seattle, returning on Sat, Nov 15 at 3:05pm from London priced at $68520% less than typical$685
- Seattle (SEA) to London (LHR).Delta, nonstop.Departing on Sat, Nov 15 at 4:48pm from Seattle, arriving on Sun, Nov 16 at 10:30am in London.Returning on Sat, Nov 22 at 6:30am from London, arriving at 11:45am in Seattle.Select Delta flight departing on Sat, Nov 15 at 4:48pm from Seattle, returning on Sat, Nov 22 at 6:30am from London priced at $67820% less than typical$678
- Seattle (SEA) to London (LHR).Virgin Atlantic, nonstop.Departing on Tue, Dec 2 at 7:20pm from Seattle, arriving on Wed, Dec 3 at 12:50pm in London.Returning on Tue, Dec 16 at 12:20pm from London, arriving at 2:58pm in Seattle.Select Virgin Atlantic flight departing on Tue, Dec 2 at 7:20pm from Seattle, returning on Tue, Dec 16 at 12:20pm from London priced at $58525% less than typical$585
- Seattle (SEA) to London (LHR).British Airways, nonstop.Departing on Tue, Dec 2 at 6:50pm from Seattle, arriving on Wed, Dec 3 at 12:20pm in London.Returning on Wed, Dec 10 at 11:45am from London, arriving at 8:37pm in Seattle.Select British Airways flight departing on Tue, Dec 2 at 6:50pm from Seattle, returning on Wed, Dec 10 at 11:45am from London priced at $59525% less than typical$595
Cheap Flights from Seattle to London (SEA-LHR)
Prices were available within the past 7 days and start at $245 for one-way flights and $400 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.
Find the cheapest month to fly from Seattle (SEA) to London (LHR)
October is typically the cheapest month to fly
Alternative airports near London
Prices were available within the past 7 days. Prices and availability are subject to change.
Origin airport | Seattle - Tacoma Intl. |
|---|---|
Destination airport | Heathrow |
Airlines serving | Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Singapore Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet |
Roundtrip price | $400 |
Distance | 4786 mi |
Average flight time | 16 hours 35 mins |
Seattle to London Flights
The cheapest times to fly from Seattle to London
On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to London are during the month of January. You can find some of the cheapest flights from Seattle to London with Expedia's search tool and vast selection of airlines.
The best time to book a flight from Seattle to London
Sunday is one of the best days to book for cheap flights from Seattle to London: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.
How to find cheap round-trip tickets from Seattle to London
Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to London in 2025. You can also book with separate airlines for your outbound and return journeys, from $245 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.
Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to London flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.
You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to London airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.
*Terms apply.
Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.
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