Question 1

Which is the best airline for flights from Seattle to London, Alaska Airlines or Virgin Atlantic?

Accepted Answer

The two airlines most popular with KAYAK users for flights from Seattle to London are Alaska Airlines and Virgin Atlantic. With an average price for the route of £725 and an overall rating of 7.9, Alaska Airlines is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of £613 and an overall rating of 7.4.

Question 2

How long does a flight from Seattle to London Heathrow Airport take?

Accepted Answer

The average direct flight takes 9h 15m, covering a distance of 4,783 miles.

Question 3

How many flights are there between Seattle and London Heathrow Airport per day?

Accepted Answer

Each day, there are 5 direct flights that take off from Seattle and land in London Heathrow Airport, with an average flight time of 9h 24m. The most common departure time is 21:00 and most flights take off in the evening. Each week, there are 35 flights and there are the same number of flights each day (5).

Question 4

What is the cheapest flight from Seattle to London Heathrow Airport?

Accepted Answer

In the last 5 days, the lowest price for a flight from Seattle to London Heathrow Airport was £227 for a one-way ticket and £546 for a return.

Question 5

Which airlines fly most frequently between Seattle and London Heathrow Airport?

Accepted Answer

British Airways connects Seattle to London Heathrow Airport with 14 flights per week. Delta also offers 7 flights per week, while Virgin Atlantic follows with 7 flights per week.

Question 6

What’s the cheapest day of the week to fly from Seattle to London Heathrow Airport?

Accepted Answer

For Seattle to London Heathrow Airport, Tuesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from London Heathrow Airport back to Seattle, the best deals are generally found on Thursday, with Sunday being the most expensive.

Question 7

Which airports will I be using when flying from Seattle to London Heathrow Airport?

Accepted Answer

Seattle airport is called Seattle/Tacoma Intl and the only airport in London Heathrow Airport is London Heathrow.

Question 8

What’s the earliest departure time from Seattle to London Heathrow Airport?

Accepted Answer

Early birds can take the earliest flight from Seattle at 13:30 and will be landing in London Heathrow Airport at 06:45.

Question 9

What’s the latest departure time from Seattle to London Heathrow Airport?

Accepted Answer

If you prefer to fly at night, the latest flight from Seattle to London Heathrow Airport jets off at 21:50 and lands at 15:35.

Question 10

Which airlines fly direct between Seattle and London Heathrow Airport?

Accepted Answer

There are 3 airlines that fly direct from Seattle to London Heathrow Airport. They are: Alaska Airlines, British Airways and Virgin Atlantic. The cheapest price of all airlines flying this route was found with British Airways at £456 for a return flight. On average, the best prices for this route can be found at Virgin Atlantic.

Question 11

Which airlines offer Wi-Fi service onboard planes from Seattle to London Heathrow Airport?

Accepted Answer

All the following airlines offer inflight Wi-Fi service on the Seattle to London Heathrow Airport flight route: Delta, Virgin Atlantic, KLM, Air France, American Airlines, Scandinavian Airlines, and JetBlue.

Question 12

Which aircraft models fly most regularly from Seattle to London Heathrow Airport?

Accepted Answer

The Boeing 787-10 Dreamliner is the aircraft model that flies most regularly on the Seattle to London Heathrow Airport flight route.

Question 13

Which airline alliances offer flights from Seattle to London Heathrow Airport?

Accepted Answer

oneworld, and SkyTeam are the airline alliances operating flights between Seattle and London Heathrow Airport, with oneworld being the most commonly used for this route.

Question 14

On which days can I fly direct from Seattle to London Heathrow Airport?

Accepted Answer

There are direct flights from Seattle to London Heathrow Airport on a daily basis.

Question 15

What is the cheapest month to fly from Seattle to London Heathrow Airport?

Accepted Answer

The cheapest month for flights from Seattle to London Heathrow Airport is January, where tickets cost £474 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £918 and £760 respectively.

Question 16

How does KAYAK find such low prices on flights from Seattle to London Heathrow Airport?

Accepted Answer

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to London Heathrow Airport.

Question 17

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to London Heathrow Airport?

Accepted Answer

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Seattle is likely to change within 7 days, so travellers know whether to wait or book now.

Question 18

What is the Hacker Fare option on flights from Seattle to London Heathrow Airport?

Accepted Answer

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to Seattle with another airline.

Question 19

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to London Heathrow Airport?

Accepted Answer

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Question 20

How often are flights from Seattle to London delayed?

Accepted Answer

Weekly flights between Seattle and London historically see delays in approximately 14% of cases, with the average delay over the past year being 139 minutes.

Question 21

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

Accepted Answer

Based on our data, Virgin Atlantic have experienced the fewest delays on this route in the past 12 months, with only about 5% of their flights encountering any delays.

Question 22

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

Accepted Answer

Statistically, Saturday is the day of the week with the fewest delays on this flight route, while Thursday has typically experienced more delays than other days.

Question 23

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

Accepted Answer

Typically, flights leaving at night tend to face fewer delays, whereas flights in the evening have historically encountered delays more often.

Question 24

Which cabin class options are there for flights between Seattle and London Heathrow Airport?

Accepted Answer

There are 3 cabin class options for the route. These are Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Question 25

Which airlines provide the cheapest flights from Seattle to London Heathrow Airport?

Accepted Answer

In the past 5 days, the cheapest return tickets from Seattle to London Heathrow Airport were found on Icelandair (£546) and Scandinavian Airlines (£547).

Question 26

How far in advance should I book a flight from Seattle to London Heathrow Airport?

Accepted Answer

To get a below average price on the flight from Seattle to London Heathrow Airport, you should book around 3 weeks before departure, which saves you about 24% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Question 27

Can I save money by flying with a stopover from Seattle to London Heathrow Airport?

Accepted Answer

No, with an average price for the route of £669, prices are generally cheapest when you fly direct.

Question 28

How much is a return flight from Seattle to London Heathrow Airport?

Accepted Answer

Flight prices are below average for this route right now.Flights to London Heathrow Airport from Seattle usually cost between £547 and £765 in February.
The lowest price found in the past 5 days was £546 on Icelandair (22 Feb–1 Mar).

Question 29

What are the most popular airlines flying to London Heathrow Airport?

Accepted Answer

The most popular airline among KAYAK users flying to London Heathrow Airport is Virgin Atlantic, followed by British Airways and Alaska Airlines.

Low season	January
High season	July
Cheapest flight	£227

SEA - LHR

£227 Find Cheap Flights from Seattle to London Heathrow Airport – Compare and Save

Everything you should know

Cheap Flights from Seattle to Heathrow (SEA-LHR)

Recent return flight deals from Seattle to Heathrow

Recent one-way flight deals from Seattle to Heathrow

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KAYAK’s insights & trends for Seattle to Heathrow flights

How much is a return flight from Seattle to London Heathrow Airport?

What’s the cheapest day of the week to fly from Seattle to London Heathrow Airport?

What is the cheapest month to fly from Seattle to London Heathrow Airport?

Can I save money by flying with a stopover from Seattle to London Heathrow Airport?

How far in advance should I book a flight from Seattle to London Heathrow Airport?

Which airlines provide the cheapest flights from Seattle to London Heathrow Airport?

Which airlines fly most frequently between Seattle and London Heathrow Airport?

Which airlines fly direct between Seattle and London Heathrow Airport?

How often are flights from Seattle to London delayed?

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

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

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

Which cabin class options are there for flights between Seattle and London Heathrow Airport?

How many flights are there between Seattle and London Heathrow Airport per day?

How long does a flight from Seattle to London Heathrow Airport take?

What’s the earliest departure time from Seattle to London Heathrow Airport?

What’s the latest departure time from Seattle to London Heathrow Airport?

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