£211 Cheap Flights from Seattle (SEA) to London (LHR)

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Seattle to London. Operating between them 15 flights per day, 20 airlines cover the route. And American Airlines, KLM, Aer Lingus, Air France, Finnair, Delta Air Lines, Iberia, Aeromexico, Virgin Atlantic, Singapore Airlines, British Airways fly direct, getting you to Heathrow in just 25hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Seattle - Tacoma Intl. to Heathrow.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Seattle - Tacoma Intl. (SEA) to Heathrow (LHR) 

The easiest way to view the best deals on flights from Seattle to London today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Seattle - Tacoma Intl. to Heathrow start at just £505 and range up to £586.  

To find an even better deal, try  

• being flexible on your dates – midweek flights can be cheaper
• looking for other airports near Seattle and London
• booking your flight during October, the cheapest month on this route
• varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Seattle to London flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Seattle - Tacoma Intl. to Heathrow for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.