Question 1

What are the cheapest airlines flying from Seattle to London Heathrow Airport round-trip?

Accepted Answer

Our cheapest airline available from Seattle to London Heathrow Airport is Virgin Atlantic. Our recent data shows that you can find tickets from as low as $592 on this airline. Additional options worth looking into are Iberia and WestJet, starting at $594 and $608 round-trip. Virgin Atlantic is currently priced 28% below the average price you’ll pay for this route.

Question 2

What are the cheapest airlines to fly from Seattle to London Heathrow Airport one-way?

Accepted Answer

The cheapest airlines for a one-way flight from Seattle to London Heathrow Airport are WestJet ($281), Icelandair ($285), and Lufthansa ($367).

Question 3

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

Accepted Answer

Booking 75 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Question 4

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

Accepted Answer

Currently, November is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of $661). Flying from Seattle to London Heathrow Airport in June is currently the most expensive (average of $1,137). 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.

Question 5

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

Accepted Answer

Travelers seeking maximum savings on their Seattle to London Heathrow Airport flight should consider departing on Monday mornings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Question 6

Weekly flight availability from Seattle to London Heathrow Airport

Accepted Answer

The most flights from SEA to LHR are scheduled on a Tuesday (18 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (6 on average).

Question 7

E

Accepted Answer

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Question 8

E

Accepted Answer

If weather is an important factor for your trip to London Heathrow Airport, 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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Question 9

What are the cheapest flights from Seattle to London Heathrow Airport?

Accepted Answer

Looking for the cheapest flight from Seattle to London Heathrow Airport? While on average our users pay $1,833, our data indicates the cheapest price to be $410. The most popular route (Seattle/Tacoma Intl - London Heathrow), is priced around $443.

Question 10

What are the most reliable airlines from Seattle to London Heathrow Airport?

Accepted Answer

No one likes to see their flight delayed. When booking a flight from Seattle to London Heathrow Airport consider choosing American Airlines (85%), Alaska Airlines (85%) or Aer Lingus (85%) as they are the most reliable in getting you off to your destination on time.

Question 11

What are the most popular airlines that fly from Seattle to London Heathrow Airport?

Accepted Answer

Before booking your flight from Seattle to London Heathrow Airport check out the most popular airlines for this route: American Airlines, Air Canada or Air France.

Question 12

What is the cheapest day to fly round-trip from Seattle to London Heathrow Airport?

Accepted Answer

Departing on a Monday is a good option for securing a great price. You can expect to save up to 16% when planning your travel around this day of the week.

Question 13

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

Accepted Answer

To save up to 35% on this flight, we recommend booking at least 47 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Seattle to London Heathrow Airport from $885 1-2 weeks out and tickets from $891 for flights departing within the next 72 hours.

Question 14

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

Accepted Answer

The best pricing can be found in the month of October. Prices to London Heathrow Airport from Seattle average $818. You can even find prices in October for less than $818, as users have found deals to London Heathrow Airport from as low as $553. The month of June appears to be one of the more expensive times to travel to London Heathrow Airport from Seattle. Flying in the targeted month can save you up to 46%.

Question 15

What is the cheapest time of day to fly from SEA to LHR?

Accepted Answer

When flying from Seattle to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 17% versus a flight in the morning.

Question 16

E

Accepted Answer

Most accurate provider: When it comes to deals on Seattle-London Heathrow Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-London Heathrow Airport flight searches over the past month and is updated monthly.

Question 17

E

Accepted Answer

Most trusted provider: When it comes to deals on Seattle-London Heathrow Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Question 18

What airport do you fly from for flights from Seattle to London Heathrow?

Accepted Answer

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 12 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 15 airlines have flights from the Seattle airport to London Heathrow. It is only a 11.4 mi journey to Seattle/Tacoma Intl (SEA) from Seattle’s city center.

Question 19

Can I find deals for flights from Seattle to Heathrow that include hotel bookings?

Accepted Answer

Yes. In addition to deals on Seattle to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

Question 20

How can I find direct flights from Seattle to Heathrow?

Accepted Answer

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Heathrow.

Question 21

Can I find deals for business class flights from Seattle to Heathrow?

Accepted Answer

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.

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$592 (CrystalTravel)
One-way from	$281 (Kiwi.com)
Popular in	June
Cheapest in	November
Average price	$739

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 3/23. Fares are subject to change and may not be available on all flights or dates of travel.

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The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in November or February, booked 75 days in advance, depart on a Tuesday or Monday and return on a Wednesday

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Find flight deals from Seattle to Heathrow

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 January 14, 2025.

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 January 14, 2025.

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 January 14, 2025.

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 January 14, 2025.

Last-minute flights from Seattle to Heathrow
Discover last-minute flight deals from Seattle to Heathrow. Data last updated January 14, 2025 and is based on user searches.

Discover last-minute flight deals from Seattle to Heathrow. Data last updated January 14, 2025 and is based on user searches.

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 January 14, 2025.

Search for one-way flight options from Seattle to Heathrow. Find affordable one-way fares based on user searches. Data last updated January 14, 2025.

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Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Heathrow in January.

$281+ Cheap flights from Seattle (SEA) to Heathrow (LHR)