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Cheap flights from Seattle to London from C$ 521

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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YXU
26 Nov — 3 Dec1
1 adult

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 21 November 2024.

Round-trip from

C$ 1,103

One-way from

C$ 521
United Airlines
  • United Airlines
  • 3/1-10/1
  • 3 total stops
  • 26h 34m total
  • Seattle to London
Search Deals
4/1
  • 4/1
  • 2 total stops
  • 34h 44m total
  • Seattle to London
Search Deals

Find flight deals from Seattle to London

Best flights from Seattle to London
Discover carefully curated flight deals from Seattle to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 21 November 2024.

Fri 3/111:51 p.m.SEA - YXU
2 stops17h 29mUnited Airlines
Fri 10/13:25 p.m.YXU - SEA
1 stop9h 05mUnited Airlines
Deal found 21/11C$ 1,103
Sat 4/13:05 p.m.SEA - YXU
3 stops20h 45mAir Canada
Sat 11/15:45 a.m.YXU - SEA
2 stops11h 40mAir Canada
Deal found 20/11C$ 1,494
Fri 3/12:16 p.m.SEA - YXU
3 stops22h 19mMultiple Airlines
Fri 10/18:00 p.m.YXU - SEA
3 stops24h 00mMultiple Airlines
Deal found 21/11C$ 2,574

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 645,034 searches. Data last updated 21 November 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 3/1

11:51 p.m.-8:20 p.m.

2 stops17h 29m

London

Fri 10/1

3:25 p.m.-9:30 p.m.

1 stop9h 05m

C$ 1,103

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 4/1

3:05 p.m.-2:50 p.m.

3 stops20h 45m

London

Sat 11/1

5:45 a.m.-2:25 p.m.

2 stops11h 40m

C$ 1,494

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 3/1

2:16 p.m.-3:35 p.m.

3 stops22h 19m

London

Fri 10/1

8:00 p.m.-5:00 p.m.

3 stops24h 00m

C$ 2,574

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 4/1

9:36 p.m.-11:20 a.m.

2 stops34h 44m

C$ 521

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 5/1

3:20 p.m.-7:12 p.m.

1 stop24h 52m

C$ 707

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 4/1

6:05 a.m.-8:20 p.m.

1 stop11h 15m

C$ 739

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/11

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.

Travel insights for flights from Seattle to London

Get recent, data-driven insights about flights from Seattle to London including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Seattle to London, Ontario?

Currently, October is the cheapest month in which you can book a flight from Seattle to London, Ontario (average of C$ 248). Flying from Seattle to London, Ontario in March is currently the most expensive (average of C$ 521). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Rainfall in London by month

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

In terms of precipitation, rainfall in London, Ontario ranges from 70.0 - 100.0 mm per month. January is typically the wettest month, when rainfall can reach 100.0 mm. March is typically the driest time to visit London, Ontario when rainfall is around 70.0 mm.

Temperature in London by month

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

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 20.0 C. Travellers hoping to avoid the cold should look outside of February, when temperatures are typically at their lowest (around -6.0 C).

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 21 November 2024.
United Airlines
7.4
Good
9,172 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.7

Overall

7.4

Reviews

1 / 10

Good boarding process. (Nice to be able to buy Group 2 boarding option.) Plane was clean. Tried to avoid full flight by flying on Saturday, but plane was full anyway. Gate area in Houston should have charging options. Should be a lounge for people with American Express Platinum Card in Houston Airport.

United Airlines
7.4
Good
9,172 reviews
United Airlines
7.4
Good
9,172 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.7

Overall

7.4

Reviews

1 / 10

Good boarding process. (Nice to be able to buy Group 2 boarding option.) Plane was clean. Tried to avoid full flight by flying on Saturday, but plane was full anyway. Gate area in Houston should have charging options. Should be a lounge for people with American Express Platinum Card in Houston Airport.

WestJet
7.3
Good
2,810 reviews
United Airlines
7.4
Good
9,172 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.7

Overall

7.4

Reviews

1 / 10

Good boarding process. (Nice to be able to buy Group 2 boarding option.) Plane was clean. Tried to avoid full flight by flying on Saturday, but plane was full anyway. Gate area in Houston should have charging options. Should be a lounge for people with American Express Platinum Card in Houston Airport.

Air Canada
7.0
Good
8,238 reviews
United Airlines
7.4
Good
9,172 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.7

Overall

7.4

Reviews

1 / 10

Good boarding process. (Nice to be able to buy Group 2 boarding option.) Plane was clean. Tried to avoid full flight by flying on Saturday, but plane was full anyway. Gate area in Houston should have charging options. Should be a lounge for people with American Express Platinum Card in Houston Airport.

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.

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

    United Airlines, at C$ 1,103, was found to be the cheapest airline from Seattle to London, Ontario. An alternate airline flying to your destination would be Air Canada.

  • 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.

  • What is the cheapest month to book a flight from Seattle to London, Ontario?

    Currently, October is the cheapest month in which you can book a flight from Seattle to London, Ontario (average of C$ 248). Flying from Seattle to London, Ontario in March is currently the most expensive (average of C$ 521). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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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?

Not ready to book yet? You can track prices for flights from Seattle to London on Cheapflights with our Price Alert feature and get notified when better prices are available.

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