$406 Cheap Flights from London to Seattle

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly from Heathrow to Seattle - Tacoma Intl.

Amazing LHR to SEA Flight Deals

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were $424 round trip and $406 one way. Prices and availability subject to change. Additional terms may apply.

Flight Schedule for LHR to SEA

CarrierFlightDepart LHRArrive SEATue
BA5309:40 am11:25 amCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
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VS10511:50 am01:35 pmCheck Fare
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DL2103:10 pm05:30 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
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BA4903:35 pm05:20 pm
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0 Stops

Frequently asked questions

Can I catch a flight from Heathrow Airport to Seattle - Tacoma Intl. Airport (SEA) right now?
Ensure you check out the Covid-19 Travel Advisor to discover if there are any present quarantine requirements or travel advice reports in effect in SEA when flying from LHR.
Are there direct flights from LHR to Sea-Tac Airport?
Your next incredible adventure is on the opposite side of a single flight. You can travel direct from LHR to Sea-Tac Airport with multiple airlines, including Virgin Atlantic and American Airlines.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Seattle - Tacoma Intl. Airport (SEA), please visit our Customer Service Portal.
How long is the flight from London Heathrow to Sea-Tac Airport?
The travel time from London Heathrow to Sea-Tac Airport typically takes about 14 hours and 41 minutes. You’ll have ample opportunity to get some shut-eye on this long-haul flight, but remember to take a top-quality neck pillow if you really want to get comfortable.
What is the flight distance from London Heathrow to SEA?
From London Heathrow to Sea-Tac Airport, the flight distance is 4,800 mi. So, it’s wise to have a range of entertainment to choose from. Movies, magazines, music … Whatever’s your style. If you come prepared, it won’t feel like too long before you hear the announcement for landing.
What airlines fly from Heathrow Airport (LHR) to Seattle - Tacoma Intl. Airport (SEA)?
There are a number of airlines that advertise direct flights from Heathrow Airport to SEA. Virgin Atlantic (VS) is one of the most well-known, offering around 30 flights every month. If you’d like more options, look up American Airlines (AA). This airline operates 30 flights every month. Between the two, you’re bound to find the flight that’s perfect for you.
What airlines have practices regarding COVID-19 in place and use social distancing?
From the moment you enter the departure terminal to when you leave the arrivals terminal, if you’re flying with Alaska Airlines, Delta or Southwest Airlines you can be sure that COVID-19 measures and social distancing rules have been adhered to. Many airlines have introduced capped capacity flights and keeping the middle seat empty.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It’s possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.


Traveling From Heathrow
Traveling To Seattle - Tacoma Intl.
Shortest Flight Time 9 hours 45 mins
Earliest Departure Time 9:25AM BST
Latest Departure Time 3:30PM BST
Lowest Flight Price $424

Route Info

Flight path for flights from London Heathrow Airport to Seattle-Tacoma International Airport

4,812.00 miles

Airlines & Aircraft Used on LHR to SEA Flight Routes

Airline Carrier
American Airlines
Airbus A319
British Airways
Airbus A330-200
British Airways
Boeing 737-800 pax
Boeing 737-800 pax
Jet Airways (India)
Airbus A320-100/200
Jet Airways (India)
Airbus A321-100/200
Jet Airways (India)
Airbus A330-200
Singapore Airlines
Boeing 737-700 (winglets) pax
Singapore Airlines
Boeing 737-800 (winglets) pax
Singapore Airlines
Embraer 190

Discover our best flights from London LHR to Seattle SEA. 

With 20 airlines to choose from on Travelocity, you can easily find the best option for you. Use our filters to sort by price, compare airlines, and find the most convenient flight times. 


Find our best return flights from London LHR to Seattle SEA at the right price  

Airfares to Seattle SEA from London LHR currently cost between $424 and $1,364. It’s usually cheaper to book a round trip than two separate one-way flights. Prices and availability subject to change. Additional terms may apply. 


Book one-way flights from London LHR to Seattle SEA 

If you want to be flexible about when you return, or keep your travel options open ended, a one-way flight could be just the ticket! You’ll find one-way airfares from London LHR to Seattle SEA on Travelocity starting at $406. Prices and availability subject to change. Additional terms may apply. 


Get to Seattle SEA from London LHR quicker with direct flights. 

Get to Seattle faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to SEA from LHR to take around 9 hour(s) 45 min(s).  


Find our cheapest airfares for flights from London LHR to Seattle SEA

Find cheap flight deals by using our search filters to sort results starting with the lowest price airfares to SEA from LHR. Our Price Match Promise means if you find a lower rate on Travelocity.com or on another US-based website within 24 hours of booking, we’ll credit or refund the difference.  


Get our best airfare deals for your flight from London LHR to Seattle SEA today 

If you’re flexible about when you travel, October is usually the cheapest month to fly from London LHR to Seattle SEA. If you need to be more specific, search by date and arrival and departure times.Then, compare prices across different airlines, and sort results by lowest price first. 


Book flexible airline tickets for flights to Seattle SEA from London LHR 

Some airlines let you change your travel dates without charging a fee. Use our ‘no change fee’ filter to see which flights to SEA from LHR have this option.  


Travel with confidence when you book flights to Seattle SEA from London LHR with Travelocity 

We’ve secured fantastic deals with all the main airline carriers and it’s easy to compare, choose, and book with Travelocity. With 24/7 customer service and our free 'App', we’ll always keep you moving. 

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.