HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Seattle (SEA) to London (YXU) from $235

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — YXU
Jun 11 — Jun 181
From?
To?
Tue 6/11
Tue 6/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Cheap flight deals from Seattle to London

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to London (YXU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 6, 2024.

Round-trip from

$300

One-way from

$258
From Seattle/Tacoma Intl to London
Search Deals
One-way flight from Seattle/Tacoma Intl to London
Search Deals

What is the cheapest time of day to fly from SEA to YXU?

It’s optimal to fly from Seattle to London, Ontario in the morning. By choosing this option you can save up to 21% on the cost of your flight, compared to a flight at noon.

Cheap Seattle to London flights in June & July 2024

Find cheap flight options from Seattle to London specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,050,429 searches. Prices were last updated on June 6, 2024.
Listed are some of the best fares we've found on flights departing from Seattle to London in 2024. Check back regularly for other flight deals.
Sat 7/67:00 amSEA - YXU
1 stop19h 18mWestJet
Sat 7/136:15 amYXU - SEA
2 stops35h 31mWestJet
Deal found 6/6$504
Sat 7/67:00 amSEA - YXU
1 stop19h 18mWestJet
Sat 7/136:15 amYXU - SEA
1 stop9h 44mWestJet
Deal found 6/6$539
Sat 7/67:00 amSEA - YXU
1 stop19h 18mMultiple Airlines
Sat 7/136:15 amYXU - SEA
3 stops21h 20mMultiple Airlines
Deal found 6/6$578
Sat 7/68:47 amSEA - YXU
3 stops17h 31mMultiple Airlines
Sat 7/136:15 amYXU - SEA
3 stops21h 20mMultiple Airlines
Deal found 6/6$677
Fri 7/512:28 amSEA - YXU
2 stops11h 17mUnited Airlines
Sat 7/133:20 pmYXU - SEA
2 stops19h 42mUnited Airlines
Deal found 6/6$817
Fri 7/512:28 amSEA - YXU
2 stops11h 17mUnited Airlines
Sat 7/133:20 pmYXU - SEA
1 stop9h 38mUnited Airlines
Deal found 6/6$992

Seattle to London 2024 flight deals

Discover exclusive flight deals for travel between Seattle and London in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 6, 2024.
Listed are some of the best fares we've found on flights departing from Seattle to London in 2024. Check back regularly for other flight deals.
Sat 7/67:00 amSEA - YXU
1 stop19h 18mWestJet
Sat 7/136:15 amYXU - SEA
2 stops35h 31mWestJet
Deal found 6/6$504
Sat 7/67:00 amSEA - YXU
1 stop19h 18mWestJet
Sat 7/136:15 amYXU - SEA
1 stop9h 44mWestJet
Deal found 6/6$539
Sat 7/67:00 amSEA - YXU
1 stop19h 18mMultiple Airlines
Sat 7/136:15 amYXU - SEA
3 stops21h 20mMultiple Airlines
Deal found 6/6$578
Sat 7/68:47 amSEA - YXU
3 stops17h 31mMultiple Airlines
Sat 7/136:15 amYXU - SEA
3 stops21h 20mMultiple Airlines
Deal found 6/6$677
Fri 7/512:28 amSEA - YXU
2 stops11h 17mUnited Airlines
Sat 7/133:20 pmYXU - SEA
2 stops19h 42mUnited Airlines
Deal found 6/6$817
Fri 7/512:28 amSEA - YXU
2 stops11h 17mUnited Airlines
Sat 7/133:20 pmYXU - SEA
1 stop9h 38mUnited Airlines
Deal found 6/6$992

One-way flights to London from Seattle

Search for one-way flight options from Seattle to London. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 6, 2024.
Users traveling one-way from Seattle to London can select one of these great deals. Users can also find round-trip Seattle to London flights by using the search form above.
Tue 6/1111:10 pmSEA - YXU
1 stop7h 06mAir Canada
Deal found 6/5$235
Sat 6/1511:10 pmSEA - YXU
1 stop12h 36mAir Canada
Deal found 6/5$258
Tue 6/119:41 pmSEA - YXU
2 stops18h 32mMultiple Airlines
Deal found 6/5$407
Sat 6/159:55 pmSEA - YXU
2 stops18h 04mWestJet
Deal found 6/5$486

Find flights from Seattle to London within your budget

Customize your flight search to find flights from Seattle to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 6, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$504 - $992

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 7/6

1 stop19h 18m

London

Sat 7/13

2 stops35h 31m

$504

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 7/6

1 stop19h 18m

London

Sat 7/13

1 stop9h 44m

$539

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 7/6

1 stop19h 18m

London

Sat 7/13

3 stops21h 20m

$578

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 7/6

3 stops17h 31m

London

Sat 7/13

3 stops21h 20m

$677

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 7/5

2 stops11h 17m

London

Sat 7/13

2 stops19h 42m

$817

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 7/5

2 stops11h 17m

London

Sat 7/13

1 stop9h 38m

$992

Flights are sorted by cheapest first

Deals found on 6/6

What is the cheapest day to fly from Seattle to London, Ontario?

Use this chart to determine the cheapest time to fly round-trip from Seattle to London. Price data was last updated on April 28, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to London, Ontario flight should consider departing on Friday mornings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from Seattle to London

Have a flexible travel schedule? Discover the best time to fly to London from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in London by month

Plan your trip to London by taking into account the average temperature and rainfall totals by month.

YXU

Temperature

21.2 - 68 °F

If weather is an important factor for your trip to London, Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of February, when temperatures are typically at their lowest (around 21.2 F).

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated June 6, 2024.
Get a feel of what it's like to fly with WestJet and United Airlines from Seattle to London by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
WestJet
7.5
Good
2,856 reviews

Food

6.4

Comfort

7.3

Boarding

7.6

Crew

8.1

Entertainment

6.4

Overall

7.5

Reviews

1 / 10

Pilots made up time on delayed flights. Air in the cabin was stuffy and too warm. Flight attendants were friendly and efficient.

WestJet
7.5
Good
2,856 reviews
WestJet
7.5
Good
2,856 reviews

Food

6.4

Comfort

7.3

Boarding

7.6

Crew

8.1

Entertainment

6.4

Overall

7.5

Reviews

1 / 10

Pilots made up time on delayed flights. Air in the cabin was stuffy and too warm. Flight attendants were friendly and efficient.

United Airlines
7.4
Good
10,696 reviews
WestJet
7.5
Good
2,856 reviews

Food

6.4

Comfort

7.3

Boarding

7.6

Crew

8.1

Entertainment

6.4

Overall

7.5

Reviews

1 / 10

Pilots made up time on delayed flights. Air in the cabin was stuffy and too warm. Flight attendants were friendly and efficient.

Air Canada
7.0
Good
7,044 reviews
WestJet
7.5
Good
2,856 reviews

Food

6.4

Comfort

7.3

Boarding

7.6

Crew

8.1

Entertainment

6.4

Overall

7.5

Reviews

1 / 10

Pilots made up time on delayed flights. Air in the cabin was stuffy and too warm. Flight attendants were friendly and efficient.

Related info for your journey

Find useful and relevant information for your journey from Seattle to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find flights from Seattle to London, Ontario for under $600 on Cheapflights?

    Yes, there are multiple flights from Seattle to London, Ontario for under $600. The cheapest flight booked recently is on WestJet for just $504, but on average you can expect to pay $684.

  • What are the cheapest airlines flying from Seattle to London, Ontario round-trip?

    Cheapflights users have booked flights from Seattle to London, Ontario round-trip from $504. Another airline that can offer you cheap pricing is United Airlines.

  • What does SEA to YXU mean?

    SEA stands for Seattle/Tacoma Intl Airport, while YXU stands for London Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.

  • Can I find deals for flights from Seattle to London that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to London flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to London with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to London flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to London that include hotel bookings?

    Yes. In addition to deals on Seattle to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to London.

  • Can I find deals for business class flights from Seattle to London?

    Yes. Cheapflights offers flight deals from Seattle to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to London that allow pets onboard?

    Many airlines flying from Seattle to London offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to London?

    Yes, you can often find last-minute deals on Seattle to London flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to London, Ontario flight deals updated?

    The Seattle to London, Ontario flight deals you see on this page were last updated on 6/6.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to London
See prices for flight routes from nearby airports that may be better suited for you.

Seattle to Pearson Intl flights
Seattle to Pierre Elliott Trudeau Intl flights
Portland to Pearson Intl flights
Seattle to Kitchener-Waterloo flights
Seattle to Hamilton flights
Seattle to Toronto Island flights
Portland to Pierre Elliott Trudeau Intl flights
Seattle to Ottawa flights
Portland to Ottawa flights
Spokane to Pearson Intl flights
Portland to Toronto Island flights
Seattle to Timmins flights
Pasco to Pearson Intl flights
Bellingham to Pearson Intl flights
Seattle to Thunder Bay flights
Spokane to Hamilton flights
Bellingham to Ottawa flights
Bellingham to Pierre Elliott Trudeau Intl flights
Pasco to Pierre Elliott Trudeau Intl flights
Walla Walla to Pierre Elliott Trudeau Intl flights

Top airline flying from Seattle to London

Discover the top airline that operate flights from Seattle to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 6, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$444Average$513FlexibilityNo cancel feeOn-time67%
Salt Lake City to Phoenix flights
Houston to New York flights
Newark Airport to Charlotte flights
Tampa to London flights
USA to Nigeria flights
USA to Sri Lanka flights
Boston to West Palm Beach flights
New York to San Diego flights
Orlando Airport to New York flights
Dallas to Los Angeles flights
USA to Prague flights
Seattle to Abbotsford flights

Search flights from Seattle to London by cabin class

Find flights from Seattle to London, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Gaziantep
Flights to Miyakojima Hirara
Flights to Figari-Sud Corse
Flights to Mason City
Flights to Komatsu
Flights to Sendai
Flights to Rhinelander Oneida County
Flights to Constanţa Mihail Kogalniceanu
Flights to Brainerd Crow Wing County
Flights to Reus
Flights to Virac
Flights to Neiva La Marguita
Flights to Pellston Emmet County
Flights to Urumqi
Flights to Bastia Poretta
Flights to Samos
Flights to Hyannis Barnstable
Flights to Provincetown
Flights to Alghero-Fertilia
Flights to Laayoune Hassan I
Flights to Devils Lake
Flights to Vava'u Lupepau'U
Flights to Hakodate
Flights to Edremit/Korfez
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines