$578 Cheap United flights from Seattle to London (SEA to LHR)

Find The Best Day To Fly from Seattle to London

Amazing United SEA to LHR Flight Deals

The cheapest flights to Heathrow found within the past 7 days were $618 round trip and $578 one way. Prices and availability subject to change. Additional terms may apply.

Tue, Oct 15 - Tue, Oct 22
SEA
Seattle
LHR
London
$618 Roundtrip, found 6 hours ago
$618
Roundtrip
found 6 hours ago
Select United flight, departing Tue, Oct 15 from Seattle to London, returning Tue, Oct 22, priced at $618 found 6 hours ago

LHR From SEA Economy Coach Packages on Similar Airlines

Price found within the past 48 hours. Click for updated prices.
Hotel Riu Plaza London Victoria

Hotel Riu Plaza London Victoria

4 out of 5
per person
Jul 1 - Jul 8
Roundtrip non-stop flight included
Seattle (SEA) to London (LHR)
ME London

ME London

5 out of 5
per person
Jul 1 - Jul 8
Roundtrip non-stop flight included
Seattle (SEA) to London (LHR)
Yotel London City

Yotel London City

4 out of 5
per person
Jul 1 - Jul 8
Roundtrip non-stop flight included
Seattle (SEA) to London (LHR)
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Frequently asked questions

Can I catch a flight from SEA to LHR right now?
It’s prudent to know about any travel advice reports and quarantine requirements in place in your destination city. Make sure you visit the Covid-19 Travel Advisor for up-to-date information on catching a flight to London Heathrow.
What terminal is United Airlines at Sea-Tac Airport?
Check your ticket to find out which Seattle - Tacoma Intl. Airport (SEA) terminal you’ll be taking off from on your way to LHR with United Airlines. If you can’t spot the details on there, get in touch with your airline.
Are there United Airlines non-stop flights from SEA to LHR?
United Airlines doesn’t have direct flights between Seattle - Tacoma Intl. Airport (SEA) and LHR, so expect to make at least one stopover. If you’re not rushed for time between flights, hit the airport shops while you wait for your connection.
How long is a United Airlines flight from SEA to LHR?
Your United Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport will take an average of 12 hours and 36 minutes, so pack some toiletries and an extra set of clothes for the trip. If you want to keep boredom and restlessness at bay, throw some travel games and books in your carry-on too.
How many direct and indirect flights does United Airlines fly from SEA to LHR?
Take your pick of approximately 3 United Airlines flights every day from SEA to LHR.
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 Heathrow Airport, please visit our Customer Service Portal.
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.

Discover our best United flight from Seattle SEA to London LHR 

To find the best deals on flights to Seattle from London with United, just enter your travel dates, filter by United, and hit search. You’ll find flights to choose from and can sort by price, flight duration, and arrival or departure time.  

 

Return flights from Seattle SEA to London LHR with United 

If you’re planning a round trip, booking return flights with United is usually the most cost-effective option. With airfares ranging from $618 to $618, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way United flights from Seattle SEA to London LHR 

A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way United flight from Seattle to London costs from $578. Prices and availability subject to change. Additional terms may apply. 

 

The easy way to find cheap flights to London LHR from  Seattle SEA with United 

To find a cheap United flight from Seattle SEA to London LHR, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference. 

 

How to find our best airfare deals on United flights from Seattle SEA to London LHR 

If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as October, or if you book a flight with a stopover. 

 

Find nonstop flights from Seattle SEA to London LHR with United 

If you’re keen to be on London soil fast, don’t waste time with a stopover—filter your search results to show direct United flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it. 

 

Flexible airline tickets for United flights from Seattle SEA to London LHR 

Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.  

 

There are a lot of reasons to book your flights to London LHR from  Seattle SEA with United on Travelocity 

At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

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Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*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.