Cheap flights from Seattle to London Heathrow Airport from C$ 485
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
19 Nov — 26 Nov1
Round-trip
1 adult
Economy
Round-trip
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in January or February, booked 65 days in advance, depart on a Sunday or Saturday and return on a Friday
Cheap flight deals from Seattle to Heathrow
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Cheapest flights from Seattle to Heathrow
Explore the most affordable flight options available from Seattle to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 October 2026.
Fri 4/123:21 p.m. -
2 stops19h 09m
Sun 6/126:40 a.m. -
2 stops24h 15m
Deal found 16/10C$ 1,079
Tue 17/112:35 p.m. -
1 stop20h 55m
Tue 24/116:40 a.m. -
2 stops18h 20m
Deal found 18/10C$ 1,114
Sun 15/112:35 p.m. -
1 stop20h 55m
Fri 11/1212:15 p.m. -
1 stop12h 45m
Deal found 18/10C$ 1,118
Mon 9/112:35 p.m. -
1 stop20h 55m
Wed 18/118:35 p.m. -
1 stop28h 25m
Deal found 16/10C$ 1,120
Wed 4/1111:10 p.m. -
2 stops35h 20m
Sat 7/1110:20 a.m. -
2 stops45h 32m
Deal found 15/10C$ 1,121
Sun 15/112:35 p.m. -
1 stop20h 55m
Tue 24/118:35 p.m. -
1 stop28h 25m
Deal found 15/10C$ 1,130
Tue 17/116:45 p.m. -
Nonstop9h 35m
Fri 11/122:45 p.m. -
Nonstop10h 15m
Deal found 18/10C$ 1,145
Tue 17/112:35 p.m. -
1 stop20h 55m
Tue 24/1112:15 p.m. -
1 stop12h 45m
Deal found 18/10C$ 1,148
Tue 17/116:45 p.m. -
Nonstop9h 35m
Tue 24/112:45 p.m. -
Nonstop10h 15m
Deal found 18/10C$ 1,151
Tue 29/126:45 p.m. -
Nonstop9h 35m
Tue 12/12:45 p.m. -
Nonstop10h 05m
Deal found 16/10C$ 1,152
Sat 7/1111:10 p.m. -
2 stops32h 50m
Tue 10/1110:20 a.m. -
2 stops19h 44m
Deal found 15/10C$ 1,164
Mon 23/1110:39 a.m. -
2 stops21h 21m
Tue 8/126:40 p.m. -
2 stops33h 44m
Deal found 15/10C$ 1,172
Best flights from Seattle to Heathrow
Discover carefully curated flight deals from Seattle to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 20 October 2026.
Sun 17/14:55 p.m. -
Nonstop9h 45m
Fri 5/26:30 a.m. -
1 stop13h 17m
Deal found 18/10C$ 1,173
Sun 17/17:20 a.m. -
2 stops24h 40m
Fri 5/27:30 p.m. -
2 stops33h 20m
Deal found 19/10C$ 1,189
Mon 23/114:50 p.m. -
Nonstop9h 50m
Tue 8/1212:20 p.m. -
Nonstop10h 30m
Deal found 19/10C$ 1,286
Sat 2/12:35 p.m. -
1 stop20h 55m
Mon 18/18:35 p.m. -
1 stop28h 25m
Deal found 19/10C$ 1,420
Sat 26/1211:59 p.m. -
1 stop23h 06m
Thu 31/1210:45 a.m. -
1 stop19h 55m
Deal found 15/10C$ 1,656
Wed 23/125:34 p.m. -
1 stop35h 56m
Tue 5/13:00 p.m. -
2 stops30h 13m
Deal found 18/10C$ 1,728
Sun 27/127:05 p.m. -
1 stop18h 00m
Wed 30/126:25 a.m. -
1 stop18h 45m
Deal found 15/10C$ 1,981
Wed 23/127:15 a.m. -
2 stops24h 45m
Tue 5/17:30 p.m. -
2 stops34h 34m
Deal found 18/10C$ 1,721
Tue 22/1211:15 p.m. -
2 stops35h 15m
Tue 5/15:00 p.m. -
2 stops37h 04m
Deal found 17/10C$ 1,745
Sun 27/124:50 p.m. -
Nonstop9h 50m
Wed 30/1212:20 p.m. -
Nonstop10h 30m
Deal found 15/10C$ 1,972
Thu 24/128:40 a.m. -
1 stop19h 10m
Sat 2/16:00 p.m. -
1 stop34h 59m
Deal found 18/10C$ 1,974
Direct flights from Seattle to Heathrow
Explore direct flight options from Seattle to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 20 October 2026.
Tue 17/116:45 p.m. -
Nonstop9h 35m
Tue 8/122:45 p.m. -
Nonstop10h 15m
Deal found 18/10C$ 1,145
Tue 17/116:45 p.m. -
Nonstop9h 35m
Tue 24/112:45 p.m. -
Nonstop10h 15m
Deal found 18/10C$ 1,151
Tue 12/16:40 p.m. -
Nonstop9h 40m
Fri 22/12:45 p.m. -
Nonstop10h 05m
Deal found 19/10C$ 1,152
Sun 28/24:55 p.m. -
Nonstop9h 45m
Tue 9/312:20 p.m. -
Nonstop10h 19m
Deal found 19/10C$ 1,187
Wed 14/49:50 p.m. -
Nonstop9h 45m
Tue 27/45:45 p.m. -
Nonstop10h 18m
Deal found 16/10C$ 1,193
Sun 28/26:40 p.m. -
Nonstop9h 40m
Wed 10/32:45 p.m. -
Nonstop10h 05m
Deal found 16/10C$ 1,199
Sat 28/116:45 p.m. -
Nonstop9h 35m
Thu 10/122:45 p.m. -
Nonstop10h 15m
Deal found 17/10C$ 1,216
Wed 13/16:40 p.m. -
Nonstop9h 40m
Tue 26/12:45 p.m. -
Nonstop10h 05m
Deal found 15/10C$ 1,220
Sat 27/26:40 p.m. -
Nonstop9h 40m
Tue 16/32:45 p.m. -
Nonstop10h 05m
Deal found 16/10C$ 1,223
Sun 18/48:20 p.m. -
Nonstop9h 25m
Thu 29/44:30 p.m. -
Nonstop9h 55m
Deal found 16/10C$ 1,226
Thu 4/36:40 p.m. -
Nonstop9h 40m
Fri 12/32:45 p.m. -
Nonstop10h 05m
Deal found 19/10C$ 1,234
Last-minute flights from Seattle to Heathrow
Discover last-minute flight deals from Seattle to Heathrow. Data last updated 20 October 2026 and is based on user searches.
Wed 4/1111:10 p.m. -
2 stops35h 20m
Sat 7/1110:20 a.m. -
2 stops45h 32m
Deal found 15/10C$ 1,121
Sat 7/1110:39 a.m. -
2 stops21h 21m
Sun 8/116:40 p.m. -
2 stops35h 24m
Deal found 15/10C$ 1,164
Mon 9/112:35 p.m. -
1 stop20h 55m
Wed 18/118:35 p.m. -
1 stop28h 25m
Deal found 16/10C$ 1,120
Sun 15/112:35 p.m. -
1 stop20h 55m
Fri 11/1212:15 p.m. -
1 stop12h 45m
Deal found 18/10C$ 1,118
Sun 15/112:35 p.m. -
1 stop20h 55m
Tue 24/118:35 p.m. -
1 stop28h 25m
Deal found 15/10C$ 1,130
Tue 17/112:35 p.m. -
3 stops19h 05m
Tue 24/116:40 a.m. -
2 stops18h 20m
Deal found 18/10C$ 1,079
Tue 17/116:45 p.m. -
Nonstop9h 35m
Tue 8/122:45 p.m. -
Nonstop10h 15m
Deal found 18/10C$ 1,145
Tue 17/112:35 p.m. -
1 stop20h 55m
Tue 24/1112:15 p.m. -
1 stop12h 45m
Deal found 18/10C$ 1,148
Tue 17/116:45 p.m. -
Nonstop9h 35m
Tue 24/112:45 p.m. -
Nonstop10h 15m
Deal found 18/10C$ 1,151
Mon 23/1110:39 a.m. -
2 stops21h 21m
Tue 8/126:40 p.m. -
2 stops33h 44m
Deal found 15/10C$ 1,172
Tue 24/117:05 p.m. -
1 stop32h 45m
Fri 27/116:35 a.m. -
1 stop14h 25m
Deal found 17/10C$ 1,183
One-way flights from Seattle to Heathrow
Search for one-way flight options from Seattle to Heathrow. Find affordable one-way fares based on user searches. Data last updated 20 October 2026.
Mon 14/122:35 p.m. -
1 stop12h 15m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 16/10C$ 485
Tue 27/108:02 a.m. -
1 stop21h 48m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 15/10C$ 491
Fri 26/24:55 p.m. -
Nonstop9h 45m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 19/10C$ 494
Thu 4/32:35 p.m. -
1 stop20h 55m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 19/10C$ 496
Fri 19/26:00 a.m. -
2 stops17h 55m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 17/10C$ 499
Thu 14/11:40 p.m. -
Nonstop9h 30m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 15/10C$ 509
Tue 17/112:35 p.m. -
2 stops23h 05m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 15/10C$ 529
Wed 17/23:51 p.m. -
3 stops20h 44m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 17/10C$ 535
Fri 19/25:07 a.m. -
3 stops21h 18m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 17/10C$ 543
Wed 3/35:07 a.m. -
3 stops21h 18m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 19/10C$ 563
Wed 13/18:30 a.m. -
3 stops38h 40m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 15/10C$ 566
Find flight deals from Seattle to Heathrow
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Heathrow (LHR). 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 20 October 2026.
Customize your flight search to find flights from Seattle to Heathrow 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 7,457,451 searches. Data last updated 20 October 2026.
Use the filters below to find and compare flights from Seattle to London Heathrow Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Cheapest round-trip
Quickest round-trip
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Thu 4/3
5:00 p.m.-10:40 a.m.
Nonstop9h 40m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 494
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Fri 15/1
6:00 a.m.-7:50 a.m.
1 stop17h 50m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 499
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Fri 19/2
5:07 a.m.-10:25 a.m.
3 stops21h 18m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 543
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Thu 12/11
4:50 p.m.-10:40 a.m.
Nonstop9h 50m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 598
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Thu 12/11
10:10 a.m.-11:50 a.m.
1 stop17h 40m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 598
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Sun 3/1
4:55 p.m.-10:40 a.m.
Nonstop9h 45m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 893
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Tue 5/1
4:55 p.m.-10:40 a.m.
Nonstop9h 45m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 894
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Sun 25/10
5:45 p.m.-10:40 a.m.
Nonstop9h 55m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 941
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Thu 24/12
4:50 p.m.-10:40 a.m.
Nonstop9h 50m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 959
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Thu 26/11
4:50 p.m.-10:40 a.m.
Nonstop9h 50m
London Heathrow
Wed 31/12
12:00 a.m.-3:00 p.m.
Nonstop0h 00m
C$ 959
Flights are sorted by cheapest round-trip flights first.
Deals found on 19/10
Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Heathrow
Have a flexible travel schedule? Discover the best time to fly to Heathrow from Seattle with our price prediction graph.
SEA-LHR
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.
Cheapflights Insights
Everything you need to know about your flight from Seattle to London Heathrow Airport
Prices
Airlines
Delays
How far ahead should I book a flight from Seattle to London Heathrow Airport?
The best time to book flights from Seattle to London Heathrow Airport is 64 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Seattle to London Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of C$ 977). Flying from Seattle to London Heathrow Airport in June is currently the most expensive (average of C$ 1,756). 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.
What is the cheapest time of day to fly from SEA to LHR?
Find hourly flight availability from Seattle to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 20 October 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to London Heathrow Airport as you normally would.
How much does it cost to fly round-trip from Seattle to London Heathrow Airport?
Airfare is typical for this route at the moment.
Seattle to London Heathrow Airport flights typically cost between C$ 987 and C$ 1,481 in February.The cheapest round-trip price found within the last 5 days was C$ 1,065 on Scandinavian Airlines (26 Feb-28 Feb).
Weekly flight availability from Seattle to London Heathrow Airport
Explore weekly flight availability from Seattle to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 20 October 2026.
The most flights from SEA to LHR are scheduled on a Tuesday (25 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (22 on average).
How often are flights from Seattle to London delayed?
About 14% of weekly flights between Seattle and London have experienced delays in the past year, with the average delay time being 130 minutes.
What is the most punctual flight time for Seattle to London flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Seattle to London flights?
Over the past year, Virgin Atlantic has had the lowest number of delays on this route, with just 5% of flights being delayed.
Reviews of airlines servicing Heathrow
Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 20 October 2026.
Read through reviews of airlines operating flights from Seattle to London Heathrow Airport, such as Icelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
First time Iceland Air. Ridiculously small amount of leg room, flight was hotter than hades and people kept requesting for cooler air that never came. You pay for everything, no food of any kind unless you pay which I've never seen on a flight of this length. Just seemed like they are cheap as possible about everything. Won't fly with them again if I can avoid it.
First time Iceland Air. Ridiculously small amount of leg room, flight was hotter than hades and people kept requesting for cooler air that never came. You pay for everything, no food of any kind unless you pay which I've never seen on a flight of this length. Just seemed like they are cheap as possible about everything. Won't fly with them again if I can avoid it.
Related info for your journey
Find useful and relevant information for your journey from Seattle to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
What airport do you fly from for flights from Seattle to London Heathrow?
Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to London Heathrow. You should not have trouble finding flights to London Heathrow from Seattle/Tacoma Intl; the airport handles an average of 24 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 1 airline has flights from the Seattle airport to London Heathrow. It is only a 18.4 km journey to Seattle/Tacoma Intl (SEA) from Seattle’s city centre.
How long is the flight from Seattle to London Heathrow Airport?
There are many flights that can get you from Seattle to London Heathrow Airport in 9h 45m. Fly via KLM, Scandinavian Airlines, or Virgin Atlantic to get the fastest option. Airlines will cover a distance of 7697 km. Both multi-stop and direct flights can be found to your destination and back.
What is the cheapest airline to fly from Seattle to London Heathrow Airport round-trip?
Flying on Icelandair is currently your cheapest option to London Heathrow Airport, with prices starting at C$ 666. Users have found that Icelandair is 47% cheaper than the other options available to this destination.
What are the most reliable airlines from Seattle to London Heathrow Airport?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to London Heathrow Airport on time: Scandinavian Airlines (95%), KLM (94%), SAUDIA (94%).
What are the cheapest flights from Seattle to London Heathrow Airport?
While on average a flight from Seattle to London Heathrow Airport is generally C$ 1,294, our data shows the cheapest flight currently is C$ 652. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay C$ 1,307 for that flight.
Can I find deals for business class flights from Seattle to Heathrow?
Yes. Cheapflights offers flight deals from Seattle to Heathrow 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 Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of C$ 977). Flying from Seattle to London Heathrow Airport in June is currently the most expensive (average of C$ 1,756). 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.
Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 20 October 2026.
Discover the top airline that operate flights from Seattle to Heathrow. 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 7,457,451 searches. Data last updated 20 October 2026.
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 Heathrow?
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 Heathrow from Seattle today with Cheapflights!
Why should you use Cheapflights to find cheap flight tickets from Seattle to Heathrow?
Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
Can Cheapflights find flights from Seattle to Heathrow with no change fees?
Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to Heathrow flexibly with Cheapflights today.
Can Cheapflights notify me if prices for flights from Seattle to Heathrow become cheaper?
Yes, Cheapflights offers price alerts on Seattle to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.
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