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United Flights from Seattle (SEA) to London (LHR)

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Amazing United SEA to LHR Flight Deals

The cheapest flights to Heathrow found within the past 7 days were $639 round trip and $529 one way. Prices and availability subject to change. Additional terms may apply.

Mon, Apr 12 -
SEA
Seattle
to
LHR
London
$529

One way

found 16 hours ago

Open SEA to LHR flights search result page
Wed, Feb 24 -
SEA
Seattle
to
LHR
London
$540

One way

found 5 days ago

Open SEA to LHR flights search result page
Wed, Feb 24 - Thu, Mar 11
SEA
Seattle
to
LHR
London
$639

Roundtrip

found 5 days ago

Open SEA to LHR flights search result page
Wed, Feb 24 - Thu, Mar 11
SEA
Seattle
to
LHR
London
$639

Roundtrip

found 5 days ago

Open SEA to LHR flights search result page
Wed, Feb 24 - Thu, Mar 11
SEA
Seattle
to
LHR
London
$649

Roundtrip

found 5 days ago

Open SEA to LHR flights search result page
Wed, Feb 24 -
SEA
Seattle
to
LHR
London
$540

One way

found 5 days ago

Open SEA to LHR flights search result page
Wed, Feb 24 - Thu, Mar 11
SEA
Seattle
to
LHR
London
$639

Roundtrip

found 5 days ago

Open SEA to LHR flights search result page
Wed, Feb 24 - Thu, Mar 11
SEA
Seattle
to
LHR
London
$639

Roundtrip

found 5 days ago

Open SEA to LHR flights search result page
Wed, Feb 24 - Thu, Mar 11
SEA
Seattle
to
LHR
London
$649

Roundtrip

found 5 days ago

Open SEA to LHR flights search result page
Mon, Apr 12 -
SEA
Seattle
to
LHR
London
$529

One way

found 16 hours ago

Open SEA to LHR flights search result page

FAQs about United Airlines Flights from SEA to LHR

What terminal is United Airlines at Sea-Tac Airport?

As soon as you receive your boarding pass for your United Airlines flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to London (LHR-Heathrow), check if the terminal details are listed on it. If not, get in touch with your carrier. They'll be able to tell you exactly where you'll be flying in and out of.

Are there United Airlines non-stop flights from SEA to LHR?

Unfortunately, there aren't any direct flights between Seattle, WA (SEA-Seattle - Tacoma Intl.) and London (LHR-Heathrow) with United Airlines. Be ready to make a stopover if you need to travel on this particular airline and route.

How long is an United Airlines flight from SEA to LHR?

Your United Airlines flight from SEA to LHR should take around 11 hours and 25 minutes, so it's wise to pack an extra set of clothes and some toiletries for the long journey. If you want to keep restlessness and boredom at bay, toss some books and puzzles in your hand luggage as well.

How many direct and indirect flights does United Airlines fly from SEA to LHR?

You have a good range of options if you're heading from SEA to LHR. You'll find at least 23 United Airlines flights available monthly.

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 London (LHR-Heathrow), please visit our Customer Service Portal.

What is the best day to buy a plane ticket?

This just in! Airfares offered on Tuesdays tend to be the cheapest, according to flight demand on Travelocity in 2019. Wednesday and Friday prices are also good, but you may want to prepare your budget if booking on a Monday, as data shows the start of the week 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 2019, flights departing on a Tuesday 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 2019 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 1-2 weeks prior to their travel dates.

How can I save money on airline tickets?

We'll let you in on a secret...You can save big on flights if you mix and match your airlines and fare types. In fact, travelers who booked flights on Travelocity in 2019 saved nearly 50% when their return flights consisted of two different airlines or fare types.

*According to flight demand on Travelocity.com from January to December 2019. Savings are subject to change based on departure location, date and destination.

Travelers ❤️ These 🏨

Price for 1 night 2 adults*

Hilton Garden Inn London Heathrow Terminal 2 and 3
Hilton Garden Inn London Heathrow Terminal 2 and 3
3.5 out of 5.0 Heathrow T2, Hounslow, England
$113

Per night/room

Jan 23 - Jan 24

4.6/5 (26 reviews)

It was very clean and comfortable. It was obvious that they take their guests health seriously. Breakfast was lovely and very tasty served by a lovely young lady by the name of Edyt.

Reviewed on Sep 22, 2020
This hotel features a restaurant, a fitness center, and a bar/lounge. Traveling on business? Take advantage of the 5 conference rooms, as well as the 24-hour ...
Novotel London Heathrow Airport T1 T2 and T3
Novotel London Heathrow Airport T1 T2 and T3
4.0 out of 5.0 234 Bath Road, Heathrow Point West, Hayes, England
$64

Per night/room

Feb 7 - Feb 8

4.3/5 (9 reviews)

Very clean and modern. It had all the amenities I could want, and the Nest restaurant had very good food. The only thing that kept this review from being perfect was the proximity to the airport. It was not clear from the hotel information I read through online that this hotel was not attached to ...

Reviewed on Sep 26, 2019
This hotel features a restaurant, a 24-hour fitness center, and a bar/lounge. Traveling on business? Take advantage of the business center, free WiFi in public ...
Radisson Blu Edwardian Heathrow Hotel & Conference Centre, London
Radisson Blu Edwardian Heathrow Hotel & Conference Centre, London
4.0 out of 5.0 140 Bath Road, Hayes, England
$93

Per night/room

Jan 18 - Jan 19

4.5/5 (13 reviews)

Beautiful room and curteoud service. Good breakfast

Reviewed on Jan 21, 2020
A full-service spa, 2 restaurants, and a 24-hour fitness center are all featured at this smoke-free hotel. Traveling on business? Take advantage of the business ...

Popular United Flight Routes from SEA

Top United Flight Routes from LHR

Top Flights for United originating from SEA

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*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.