Q: What is the typical price of a round-trip flight between London Heathrow Airport and Seattle?

Prices are currently low for flights on this route. Typical prices usually range from £412 to £557. The lowest price recently found on this route was £394.

Question 1

What is the typical price of a round-trip flight between London Heathrow Airport and Seattle?

Accepted Answer

Prices are currently low for flights on this route.Typical prices usually range from £412 to £557.
The lowest price recently found on this route was £394.

Question 2

What is the cheapest time of day to depart on your flight to Seattle?

Accepted Answer

According to our data, the cheapest time of day to fly to Seattle is in the morning. momondo users have found flights departing from London Heathrow Airport to Seattle in the morning for as low as £601. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive, with an average ticket price of £612.

Question 3

Can stopping save me money on London Heathrow Airport to Seattle flights?

Accepted Answer

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Seattle.

Question 4

Which stopover airport has the shortest connection time from London Heathrow Airport to Seattle?

Accepted Answer

Denver (DEN) has the shortest average stopover time for this route: 1h 31m.

Question 5

What is the cheapest day to depart on your flight to Seattle?

Accepted Answer

According to our data, Wednesday is the cheapest day to fly to Seattle from London Heathrow Airport. The lowest ticket price found for a Wednesday departure recently was £578. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Seattle on Sunday is £646.

Question 6

How many flights depart from London Heathrow Airport to Seattle on average per day?

Accepted Answer

As of February 2026, 13 flights take off from London Heathrow Airport and land in Seattle each day. The most common flight departure time for this route is 14:00, with 87% of daily flights taking off in the afternoon.

Question 7

What is the cheapest London Heathrow to Seattle/Tacoma Intl flight route?

Accepted Answer

Fly from London Heathrow to Seattle/Tacoma Intl for the best London Heathrow - Seattle/Tacoma Intl flight prices

Question 8

Which stopover airport has the shortest travel time from London Heathrow Airport to Seattle?

Accepted Answer

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 13h 44m.

Question 9

How far in advance should I book a flight to Seattle?

Accepted Answer

You are more likely to see cheaper flights to Seattle from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around £552 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from London Heathrow Airport for as low as £517 on momondo.

Question 10

Which airlines fly to Seattle?

Accepted Answer

Virgin Atlantic, British Airways and KLM are the top three most popular airlines that fly to Seattle from London Heathrow Airport according to our data. Virgin Atlantic is the first choice among our users, with 55% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 14 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Question 11

Which stopover airport offers the lowest fares from London Heathrow Airport to Seattle?

Accepted Answer

Flights via Munich (MUC) offer the lowest average return price of £363.

Question 12

What cabin class options are available on London Heathrow to Seattle/Tacoma Intl flights?

Accepted Answer

There are 4 cabin classes available to choose from on London Heathrow to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Question 13

What is the cheapest airline that flies from London Heathrow to Seattle/Tacoma Intl?

Accepted Answer

Icelandair, SWISS, and British Airways are the most popular carriers operating from London Heathrow to Seattle/Tacoma Intl

Question 14

How often are flights from London to Seattle delayed?

Accepted Answer

Historically, on average around 12% of flights between London and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 128 minutes.

Question 15

What is the cheapest month to fly to Seattle?

Accepted Answer

The cheapest month to fly to Seattle from London Heathrow Airport is in February. Flight prices, which tend to average around £454, are often lower during this time because this is during the off-season. The month of January is another great option to travel to Seattle, with average flight prices from London Heathrow Airport averaging around £500.

Question 16

What day of the week experiences the fewest flight delays on this route?

Accepted Answer

Thursday is statistically the day of the week that experiences the fewest delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

Question 17

Which airline has the best punctuality record on London to Seattle flights?

Accepted Answer

According to our data, Delta have had the fewest delays on this route over the last 12 months, with about 5% of their flights experiencing any sort of delay.

Question 18

Which airport is the most popular for stopovers for flights between London Heathrow Airport and Seattle?

Accepted Answer

Reykjavik (KEF) was the most common stop: 60% of momondo users choosing one-stop flights on this route connected there.

Question 19

How many flights depart from London Heathrow Airport to Seattle on average per week?

Accepted Answer

93 flights are operational weekly from London Heathrow Airport to Seattle as of February 2026. The most popular departure day for this route is Sat, with 23% of flights per week taking off on this day.

Question 20

How have London Heathrow Airport to Seattle flight prices changed over time?

Accepted Answer

As of February 2026, prices for London Heathrow Airport to Seattle flights are approximately 5% cheaper when compared to flights at the same time last year.

Question 21

What is the most punctual flight time for London to Seattle flights?

Accepted Answer

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Question 22

When did momondo last update prices for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport?

Accepted Answer

Prices for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport were last updated today.

Question 23

How many operators does momondo search for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport?

Accepted Answer

As of February 2026, there are 14 operators available to choose from for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport.

Question 24

How old do you have to be to fly from London Heathrow Airport to Seattle/Tacoma Intl Airport?

Accepted Answer

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London Heathrow Airport to Seattle/Tacoma Intl Airport.

Question 25

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

Accepted Answer

The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best price found	£461
Fastest flight time	9h 45m
Direct flights	Every day
Airports in Seattle	1 airport

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom £331	Free Cancellation	Rating 6.8 7,775 reviews	Search Lufthansa flights
Icelandair	PriceFrom £344	Free Cancellation	Rating 7.1 606 reviews	Search Icelandair flights
Aer Lingus	PriceFrom £411	Free Cancellation	Rating 7.2 1,446 reviews	Search Aer Lingus flights
Air Canada	PriceFrom £415	Free Cancellation	Rating 7.1 10,698 reviews	Search Air Canada flights
United Airlines	PriceFrom £424	Free Cancellation	Rating 7.4 9,256 reviews	Search United Airlines flights
Virgin Atlantic	PriceFrom £426	Free Cancellation	Rating 7.5 678 reviews	Search Virgin Atlantic flights
KLM	PriceFrom £430	Free Cancellation	Rating 7.7 1,450 reviews	Search KLM flights
Finnair	PriceFrom £438	Free Cancellation	Rating 7.6 1,357 reviews	Search Finnair flights
Air France	PriceFrom £444	Free Cancellation	Rating 7.4 1,531 reviews	Search Air France flights
British Airways	PriceFrom £444	Free Cancellation	Rating 6.7 7,720 reviews	Search British Airways flights

Cheap flights from London Heathrow Airport to Seattle from £341

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Seattle departing on 6/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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