$112+ Cheap flights from Seattle (SEA) to London, ON (YXU)
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 7/25. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Seattle to London with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.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 12, 2025.
Round-trip from | $255 (oojo) |
|---|---|
One-way from | $112 (Gotogate) |
Find flight deals from Seattle to London
Cheapest flights from Seattle to LondonExplore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.
Explore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.
This oojo deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Air Canada deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cheapflights Fare Finder
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 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from Seattle to London that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Thu 7/17
7:35 pm-5:14 am
1 stop6h 39m
London
Tue 7/22
6:00 am-12:58 pm
1 stop9h 58m
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Mon 7/14
7:15 pm-9:17 am
2 stops11h 02m
London
Fri 7/25
6:15 am-11:00 am
1 stop7h 45m
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Thu 7/17
7:35 pm-5:14 am
1 stop6h 39m
London
Fri 7/18
9:45 pm-4:09 pm
2 stops21h 24m
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Fri 7/18
11:58 pm-3:02 pm
2 stops12h 04m
London
Tue 7/22
6:15 am-11:00 am
1 stop7h 45m
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Mon 7/14
7:35 pm-5:14 am
1 stop6h 39m
London
Mon 7/21
6:00 am-12:58 pm
1 stop9h 58m
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Fri 7/25
7:35 pm-5:14 am
1 stop6h 39m
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Sat 7/5
7:20 am-9:27 pm
2 stops11h 07m
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Fri 7/25
11:58 pm-3:02 pm
2 stops12h 04m
SeattleLondon
SEA - YXU
SEAYXU
Seattle/Tacoma Intl
Sat 7/5
10:47 am-5:14 am
3 stops39h 27m
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.
Cheapflights Insights
Everything you need to know about your flight from Seattle to London
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 2.8 - 3.9 inches per month. January is typically the wettest month, when rainfall can reach 3.9 in. March is typically the driest time to visit London, Ontario when rainfall is around 2.8 in.
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 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 12, 2025.
Food
Overall
Comfort
Entertainment
Boarding
Crew
Reviews
Kim,May 2025
PIH - SLC
Food
Overall
Comfort
Entertainment
Boarding
Crew
Reviews
Kim,May 2025
PIH - SLC
Food
Overall
Comfort
Entertainment
Boarding
Crew
Reviews
Kim,May 2025
PIH - SLC
Food
Overall
Comfort
Entertainment
Boarding
Crew
Reviews
Kim,May 2025
PIH - SLC
Food
Overall
Comfort
Entertainment
Boarding
Crew
Reviews
Kim,May 2025
PIH - SLC
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.
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Alternative routes for Seattle to London
See prices for flight routes from nearby airports that may be better suited for you.
Top 2 airlines flying from Seattle to London
Discover the top 2 airlines 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 2,558,603 searches. Data last updated June 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$185 | Average$660 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$248 | Average$603 | FlexibilityNo cancel fee | On-time67% |