HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Seattle (SEA) to London (YXU) from $251

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 6/6. 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 4 — Jun 111
From?
To?
Tue 6/4
Tue 6/11
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 May 30, 2024.

Round-trip from

$230
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 Air Canada flights from Seattle to London

Explore cheap flight options specifically provided by Air Canada for the route between Seattle and London. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated May 30, 2024.
Mon 8/1911:10 pmSEA - YXU
1 stop7h 05mAir Canada
Mon 8/266:00 amYXU - SEA
2 stops11h 34mAir Canada
Deal found 5/30$509
Mon 8/197:05 pmSEA - YXU
2 stops11h 10mAir Canada
Mon 8/266:00 amYXU - SEA
2 stops11h 34mAir Canada
Deal found 5/30$514
Tue 6/1811:05 pmSEA - YXU
1 stop7h 10mAir Canada
Tue 7/93:20 pmYXU - SEA
1 stop9h 38mAir Canada
Deal found 5/29$519
Tue 6/187:40 amSEA - YXU
2 stops22h 35mAir Canada
Tue 7/96:00 amYXU - SEA
1 stop7h 51mAir Canada
Deal found 5/29$640
Tue 6/187:40 amSEA - YXU
2 stops22h 35mAir Canada
Tue 7/93:20 pmYXU - SEA
2 stops10h 00mAir Canada
Deal found 5/29$873

Cheap Seattle to London flights in May & June 2024

Find cheap flight options from Seattle to London specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,784,634 searches. Prices were last updated on May 30, 2024.
Tue 6/1811:05 pmSEA - YXU
1 stop7h 10mAir Canada
Tue 7/93:20 pmYXU - SEA
1 stop9h 38mAir Canada
Deal found 5/29$519
Mon 6/311:40 amSEA - YXU
1 stop6h 56mAir Canada
Tue 6/116:00 amYXU - SEA
1 stop7h 43mAir Canada
Deal found 5/30$534
Mon 6/311:10 pmSEA - YXU
1 stop7h 06mAir Canada
Tue 6/116:00 amYXU - SEA
2 stops9h 27mAir Canada
Deal found 5/30$539
Mon 6/37:05 pmSEA - YXU
2 stops11h 11mAir Canada
Tue 6/116:00 amYXU - SEA
2 stops11h 27mAir Canada
Deal found 5/30$544
Tue 6/187:40 amSEA - YXU
2 stops22h 35mAir Canada
Tue 7/96:00 amYXU - SEA
1 stop7h 51mAir Canada
Deal found 5/29$640
Tue 6/187:40 amSEA - YXU
2 stops22h 35mAir Canada
Tue 7/93:20 pmYXU - SEA
2 stops10h 00mAir Canada
Deal found 5/29$873
Tue 6/1812:13 pmSEA - YXU
3 stops27h 46mMultiple Airlines
Tue 7/98:00 pmYXU - SEA
2 stops31h 35mMultiple Airlines
Deal found 5/29$1,065

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 2,784,634 searches. Data last updated May 30, 2024.
Mon 8/197:00 amSEA - YXU
1 stop19h 18mWestJet
Mon 8/266:15 amYXU - SEA
1 stop9h 41mWestJet
Deal found 5/30$468
Mon 8/1911:10 pmSEA - YXU
1 stop7h 05mAir Canada
Mon 8/266:00 amYXU - SEA
2 stops11h 34mAir Canada
Deal found 5/30$509
Mon 8/197:05 pmSEA - YXU
2 stops11h 10mAir Canada
Mon 8/266:00 amYXU - SEA
2 stops11h 34mAir Canada
Deal found 5/30$514
Tue 6/1811:05 pmSEA - YXU
1 stop7h 10mAir Canada
Tue 7/93:20 pmYXU - SEA
1 stop9h 38mAir Canada
Deal found 5/29$519
Mon 6/311:40 amSEA - YXU
1 stop6h 56mAir Canada
Tue 6/116:00 amYXU - SEA
1 stop7h 43mAir Canada
Deal found 5/30$534
Mon 6/311:10 pmSEA - YXU
1 stop7h 06mAir Canada
Tue 6/116:00 amYXU - SEA
2 stops9h 27mAir Canada
Deal found 5/30$539
Mon 6/37:05 pmSEA - YXU
2 stops11h 11mAir Canada
Tue 6/116:00 amYXU - SEA
2 stops11h 27mAir Canada
Deal found 5/30$544
Tue 6/187:40 amSEA - YXU
2 stops22h 35mAir Canada
Tue 7/96:00 amYXU - SEA
1 stop7h 51mAir Canada
Deal found 5/29$640
Tue 6/187:40 amSEA - YXU
2 stops22h 35mAir Canada
Tue 7/93:20 pmYXU - SEA
2 stops10h 00mAir Canada
Deal found 5/29$873

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 2,784,634 searches. Data last updated May 30, 2024.
Thu 6/611:10 pmSEA - YXU
1 stop7h 06mAir Canada
Deal found 5/28$251
Sat 6/1511:10 pmSEA - YXU
1 stop12h 36mAir Canada
Deal found 5/29$274
Thu 6/67:40 amSEA - YXU
2 stops22h 36mAir Canada
Deal found 5/28$279
Sat 6/159:55 pmSEA - YXU
2 stops28h 23mWestJet
Deal found 5/29$424
Sat 6/159:55 pmSEA - YXU
2 stops28h 23mWestJet
Deal found 5/30$451
Thu 6/611:59 pmSEA - YXU
3 stops26h 31mMultiple Airlines
Deal found 5/28$463

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 2,784,634 searches. Data last updated May 30, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$468 - $1,065

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 8/19

1 stop19h 18m

London

Mon 8/26

1 stop9h 41m

$468

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 8/19

1 stop7h 05m

London

Mon 8/26

2 stops11h 34m

$509

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 8/19

2 stops11h 10m

London

Mon 8/26

2 stops11h 34m

$514

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/18

1 stop7h 10m

London

Tue 7/9

1 stop9h 38m

$519

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/18

2 stops22h 35m

London

Tue 7/9

1 stop7h 51m

$640

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/18

2 stops22h 35m

London

Tue 7/9

2 stops10h 00m

$873

Seattle/Tacoma IntlLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/18

3 stops27h 46m

London

Tue 7/9

2 stops31h 35m

$1,065

Flights are sorted by cheapest first

Deals found on 5/30

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

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 May 30, 2024.
WestJet
7.5
Good
2,869 reviews
Check prices

Food

6.4

Comfort

7.3

Overall

7.5

Boarding

7.7

Entertainment

6.4

Crew

8.1

Reviews

1 / 10

System was down and the line on the check in counter was very slow.

WestJet
7.5
Good
2,869 reviews
WestJet
7.5
Good
2,869 reviews
Check prices

Food

6.4

Comfort

7.3

Overall

7.5

Boarding

7.7

Entertainment

6.4

Crew

8.1

Reviews

1 / 10

System was down and the line on the check in counter was very slow.

Air Canada
7.0
Good
7,004 reviews
WestJet
7.5
Good
2,869 reviews
Check prices

Food

6.4

Comfort

7.3

Overall

7.5

Boarding

7.7

Entertainment

6.4

Crew

8.1

Reviews

1 / 10

System was down and the line on the check in counter was very slow.

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 $500 on Cheapflights?

    Yes, there are multiple flights from Seattle to London, Ontario for under $500. The cheapest flight booked recently is on WestJet for just $468, but on average you can expect to pay $655.

  • 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 $468. Another airline that can offer you cheap pricing is Air Canada.

  • 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 5/30.

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
Seattle to Kitchener-Waterloo flights
Seattle to Hamilton flights
Seattle to Toronto Island flights
Portland to Pearson Intl flights
Portland to Pierre Elliott Trudeau Intl flights
Seattle to Ottawa flights
Spokane to Pearson Intl flights
Portland to Toronto Island flights
Seattle to Timmins flights
Portland to Ottawa flights
Pasco to Pearson Intl flights
Spokane to Hamilton flights
Bellingham to Pierre Elliott Trudeau Intl flights
Seattle to Thunder Bay flights
Pasco to Pierre Elliott Trudeau Intl flights
Bellingham to Pearson Intl flights
Bellingham to Ottawa 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 2,784,634 searches. Data last updated May 30, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$444Average$513FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
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 Laayoune Hassan I
Flights to Virac
Flights to Figari-Sud Corse
Flights to Edremit/Korfez
Flights to Rhinelander Oneida County
Flights to Girona Costa Brava
Flights to Brainerd Crow Wing County
Flights to Parikia Paros
Flights to Cortez Montezuma County
Flights to Miyakojima Hirara
Flights to Zadar
Flights to Trapani Birgi
Flights to Provincetown
Flights to Oran Es Senia
Flights to Constanţa Mihail Kogalniceanu
Flights to Vava'u Lupepau'U
Flights to Urumqi
Flights to Hakodate
Flights to Naxos
Flights to Dalaman
Flights to Hyannis Barnstable
Flights to Devils Lake
Flights to Bastia Poretta
Flights to Karpathos

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to London?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to London from Seattle today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Seattle to London?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Seattle to London for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Seattle to London with no change fees?

Need flexible booking options for your flight to London from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to London become cheaper?

Of course! You can now track prices for flights from Seattle to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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