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Cheap flights from Seattle to London Heathrow Airport from £155

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
23 Oct — 30 Oct1
1 adult

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

Cheap 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 18 October 2024.

Round-trip from

£405

One-way from

£155

Popular in

June

Cheapest in

November
Icelandair
  • Icelandair
  • 19/11-26/11
  • 2 total stops
  • 40h 35m total
  • Seattle to London
Search Deals
Icelandair
  • Icelandair
  • 9/12
  • 1 total stop
  • 12h 15m total
  • Seattle to London
Search Deals
High demand for flights, 32% potential price rise
Search Deals
Best time to find cheap flights, 17% potential price drop
Search Deals

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 18 October 2024.

Tue 12/1114:35SEA - LHR
1 stop20h 55mIcelandair
Sun 17/1120:40LHR - SEA
1 stop28h 20mIcelandair
Deal found 17/10£459
Wed 13/1110:35SEA - LHR
2 stops14h 45mMultiple Airlines
Wed 20/1106:30LHR - SEA
2 stops20h 02mMultiple Airlines
Deal found 16/10£460
Tue 19/1110:35SEA - LHR
2 stops14h 45mLufthansa
Tue 26/1106:30LHR - SEA
2 stops20h 02mLufthansa
Deal found 17/10£474
Sun 1/1218:55SEA - LHR
Nonstop9h 45mVirgin Atlantic
Sun 8/1212:40LHR - SEA
Nonstop10h 00mVirgin Atlantic
Deal found 17/10£477
Mon 18/1117:45SEA - LHR
Nonstop9h 25mDelta
Wed 4/1206:30LHR - SEA
1 stop13h 22mDelta
Deal found 17/10£482
Tue 19/1118:50SEA - LHR
Nonstop9h 25mIberia
Tue 26/1115:00LHR - SEA
Nonstop9h 55mIberia
Deal found 17/10£493
Sun 8/1213:45SEA - LHR
1 stop13h 55mKLM
Fri 20/1215:50LHR - SEA
Nonstop10h 40mKLM
Deal found 16/10£497
Wed 11/1210:35SEA - LHR
2 stops14h 45mAir Canada
Tue 24/1218:00LHR - SEA
1 stop35h 20mAir Canada
Deal found 17/10£498
Mon 25/1113:55SEA - LHR
2 stops19h 55mSWISS
Tue 10/1208:55LHR - SEA
2 stops20h 14mSWISS
Deal found 17/10£499
Thu 14/1110:35SEA - LHR
1 stop15h 35mUnited Airlines
Thu 21/1106:30LHR - SEA
1 stop13h 40mUnited Airlines
Deal found 16/10£520
Fri 15/1113:45SEA - LHR
Nonstop9h 25mBritish Airways
Fri 22/1109:25LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 17/10£522
Sun 17/1120:00SEA - LHR
1 stop12h 50mAer Lingus
Wed 20/1107:50LHR - SEA
1 stop18h 25mAer Lingus
Deal found 17/10£535

Find flights from Seattle to Heathrow within your budget

Customise 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 1,032,784 searches. Data last updated 18 October 2024.

Fly from

Any airport

Fly to

Any airport

Budget

£405 - £503

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 19/11

1 stop12h 15m

London Heathrow

Tue 26/11

1 stop28h 20m

£405

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 14/1

1 stop12h 15m

London Heathrow

Sat 3/5

2 stops31h 21m

£418

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 19/11

Nonstop9h 25m

London Heathrow

Tue 26/11

Nonstop9h 55m

£439

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 25/1

1 stop13h 30m

London Heathrow

Sun 9/2

1 stop31h 31m

£450

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 19/11

1 stop15h 35m

London Heathrow

Tue 26/11

2 stops20h 02m

£474

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 1/12

Nonstop9h 45m

London Heathrow

Sun 8/12

Nonstop10h 00m

£477

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 18/11

Nonstop9h 25m

London Heathrow

Wed 4/12

1 stop13h 22m

£482

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 19/3

Nonstop9h 25m

London Heathrow

Wed 2/4

Nonstop9h 45m

£483

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 4/3

1 stop20h 25m

London Heathrow

Fri 14/3

1 stop13h 40m

£490

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 14/1

Nonstop9h 25m

London Heathrow

Thu 30/1

Nonstop9h 55m

£494

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 8/12

1 stop13h 55m

London Heathrow

Wed 18/12

Nonstop10h 40m

£497

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 26/3

1 stop16h 35m

London Heathrow

Fri 4/4

1 stop12h 15m

£503

Flights are sorted by cheapest first

Deals found on 17/10

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.
Estimated return 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.

Travel insights for flights from Seattle to Heathrow

Get recent, data-driven insights about flights from Seattle to Heathrow including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a return flight from Seattle to Heathrow. Price data was last updated on 11 October 2024.

The price you pay for your flight from Seattle to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Find deals

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 £112). Flying from Seattle to London Heathrow Airport in July is currently the most expensive (average of £159). 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 18 October 2024.

Unlike at midday, when flights are generally more expensive, you can save up to 8% on flights from Seattle to London Heathrow Airport by exploring options for tickets in the afternoon.

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 18 October 2024.

The most flights from SEA to LHR are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 on average).

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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 18 October 2024.
Read reviews from past customers who have flown WestJet, United Airlines and Finnair from Seattle to London. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
8,911 reviews
Check prices

Entertainment

8.0

Comfort

7.9

Food

7.4

Overall

8.0

Crew

8.6

Boarding

8.2

Reviews

1 / 10

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.

Delta
8.0
Very Good
8,911 reviews
Delta
8.0
Very Good
8,911 reviews
Check prices

Entertainment

8.0

Comfort

7.9

Food

7.4

Overall

8.0

Crew

8.6

Boarding

8.2

Reviews

1 / 10

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.

KLM
7.8
Good
1,361 reviews
Delta
8.0
Very Good
8,911 reviews
Check prices

Entertainment

8.0

Comfort

7.9

Food

7.4

Overall

8.0

Crew

8.6

Boarding

8.2

Reviews

1 / 10

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.

Finnair
7.7
Good
1,322 reviews
Delta
8.0
Very Good
8,911 reviews
Check prices

Entertainment

8.0

Comfort

7.9

Food

7.4

Overall

8.0

Crew

8.6

Boarding

8.2

Reviews

1 / 10

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.

Virgin Atlantic
7.6
Good
669 reviews
Delta
8.0
Very Good
8,911 reviews
Check prices

Entertainment

8.0

Comfort

7.9

Food

7.4

Overall

8.0

Crew

8.6

Boarding

8.2

Reviews

1 / 10

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.

Air France
7.4
Good
1,554 reviews
Delta
8.0
Very Good
8,911 reviews
Check prices

Entertainment

8.0

Comfort

7.9

Food

7.4

Overall

8.0

Crew

8.6

Boarding

8.2

Reviews

1 / 10

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.

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?

    If you book a flight to London Heathrow from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 16 flights from Seattle/Tacoma Intl to London Heathrow per day from 4 different airlines.

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

    Cheapflights users have booked flights from Seattle to London Heathrow Airport round-trip from £405. Other airlines that can offer you cheap pricing are Iberia, from £439, and WestJet, from £450. You may be able to fly from Seattle to London Heathrow Airport for 36% less than the average price by searching for these airlines.

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

    One-way options have recently been found by users for as low as £155 on Icelandair. Other airlines that offer cheap prices include WestJet from £158 and Iberia from £289 one-way.

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

    Consider KLM (73%), Air France (73%) or Delta (73%) when booking your flight. These represent the most reliable airlines when flying from Seattle to London Heathrow Airport.

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

    While on average a flight from Seattle to London Heathrow Airport is generally £665, our data shows the cheapest flight currently is £332. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay £404 for that flight.

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

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

  • How can I find direct flights from Seattle to Heathrow?

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

  • 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 £112). Flying from Seattle to London Heathrow Airport in July is currently the most expensive (average of £159). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 4 airlines flying from Seattle to Heathrow

Discover the top 4 airlines 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 1,032,784 searches. Data last updated 18 October 2024.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£373Average£487FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£456Average£590FlexibilityNo cancel feeOn-time77%
Search Air France flights
Virgin AtlanticCheapest£462Average£683FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£476Average£677FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Heathrow?

Cheapflights helps you search for flights from Seattle to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Heathrow?

Cheapflights helps you find that perfect flight to Heathrow from Seattle by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Seattle to Heathrow with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Heathrow with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Heathrow become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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