Statistics on London-Seattle flights: what is the right price and when to buy your plane ticket?

Best time to go: what is the RIGHT price for a round-trip flight to Seattle (from: London)

The average price to go to Seattle from London airport is $ 809 (round trip). However, there are variations depending on the departure month. Thus, it is possible to pay for your plane ticket on average between $ 686 (in february) and $ 1174 (in august), which is a saving of $ 124 or a surplus of $ 365 (compared to the average price) depending on the period you leave.

The analysis of all prices reveals that the most frequent price is between $594 to $648 and it is generally more economical to leave on a wednesday and return on a monday on a flight with 1 or more layovers.

Be careful, the cheapest months may correspond to unfavorable weather periods . Check out our page best time to go to Seattle before booking your flight.

If you want to know when to book your flight at the best price, go straight to the second part of this page: When to buy your London-Seattle plane ticket.

How are these data calculated?

We have studied a sample of 60000 airfare prices from previous years for flights to Seattle from London and can thus establish precise and credible price variation trends based on different parameters. Of course, prices can vary from year to year, but the seasonal aspect of this data (recurrence of school holidays, events... from year to year) makes these statistics quite reliable.

Average price depending on the departure month

Created with Highcharts 8.2.2 $781 $781 $686 $686 $696 $696 $854 $854 $717 $717 $813 $813 $928 $928 $1174 $1174 $716 $716 $733 $733 $716 $716 $890 $890Average price of round-trip airfare in USD according to the departure monthjan.feb.mar.apr.mayjun.jul.aug.sep.oct.nov.dec.5006007008009001000110012001300

Data analysis:

By leaving in february, the price of the plane ticket will statistically be the cheapest ($ 686, saving $ 124 compared to the average price over the year which is $ 809). Conversely, august will be the most expensive ($ 1174).

Flight London-Seattle: when is the best time to go for the best price?

Month Good price* Average price Our opinion
January$ 595 $ 781 good price
February$ 588 $ 686 very good price
March$ 597 $ 696 good price
April$ 651 $ 854 fair price
May$ 604 $ 717 good price
June$ 675 $ 813 good price
July$ 754 $ 928 fair price
August$ 1053 $ 1174 very high price
September$ 615 $ 716 good price
October$ 641 $ 733 good price
November$ 607 $ 716 good price
December$ 697 $ 890 fair price

*great price to buy your plane ticket: if you see this price or cheaper during your flight search, go for it and buy it!

Price breakdown to travel from London to Seattle

Created with Highcharts 8.2.21%1%7%7%11%11%15%15%15%15%11%11%8%8%6%6%4%4%3%3%3%3%2%2%2%2%2%2%2%2%2%2%2%2%Percentage of plane tickets found at this price$432 to $486$486 to $540$540 to $594$594 to $648$648 to $702$702 to $756$756 to $810$810 to $864$864 to $918$918 to $972$972 to $1026$1026 to $1080$1080 to $1134$1134 to $1188$1188 to $1242$1242 to $1296$1296 to $135001051520

Data analysis:

The prices for flights from London to Seattle range from $432 to $1350. 1% of tickets were purchased at the minimum price (from $432 to $486), 2% at the maximum price (from $1296 to $1350). The majority of plane tickets were purchased in the range of $648 to $702 (15% of tickets).

Cheapest airlines for the London->Seattle flight

There are 12 companies that serve London from Seattle airport: Virgin Atlantic, British Airways, Icelandair, Air France, KLM, Finnair, Delta, Lufthansa, Iberia, Air Canada, American Airlines and Ryanair.

Created with Highcharts 8.2.2Virgin Atlantic: 28 %Virgin Atlantic: 28 %British Airways: 25 %British Airways: 25 %Icelandair: 14 %Icelandair: 14 %Air France: 7 %Air France: 7 %KLM: 6 %KLM: 6 %Finnair: 4 %Finnair: 4 %Delta: 3 %Delta: 3 %Lufthansa: 3 %Lufthansa: 3 %Iberia: 2 %Iberia: 2 %Air Canada: 1 %Air Canada: 1 %

Data analysis:

Of the 60000 flights analyzed in previous years, Virgin Atlantic was the airline that offered the best fare most often in the flight ticket search results (28% of the time) on the London->Seattle route.

Direct flight or flight with layover?

Created with Highcharts 8.2.2 $847 $847 $716 $716Average ticket price: direct flight or flight with layover(s)Direct flightFlight with layover600650700750800850900

Data analysis:

To get the best price for the London-Seattle flight, you should take a flight with one or more layovers (you will save an average of $ 142 compared to a direct flight).

Which day of the week to leave?

Created with Highcharts 8.2.2 $ +141 $ +141 $ +7 $ +7 $ -31 $ -31 $ -61 $ -61 $ -22 $ -22 $ +4 $ +4 $ +6 $ +6Average airfare price according to the departure daya sundaya mondaya tuesdaya wednesdaya thursdaya fridaya saturday-100-50050100150200

Data analysis:

Statistically, London-Seattle flights departing on a wednesday are cheaper than on other days of the week. By choosing a wednesday as your departure date, you can save an average of $61. On the other hand, departing on a sunday may cost you an additional $141.

Which day of the week to come back?

Created with Highcharts 8.2.2 $ -18 $ -18 $ -63 $ -63 $ -62 $ -62 $ -45 $ -45 $ +7 $ +7 $ +87 $ +87 $ +79 $ +79Average airfare price based on the return daya sundaya mondaya tuesdaya wednesdaya thursdaya fridaya saturday-75-50-250255075100

Data analysis:

Statistically, return flights from Seattle to London departing on a monday are cheaper than on other days of the week. By choosing a monday for your return date, you will save an average of $63. Conversely, departing from Seattle on a friday may cost you an additional $87.

Top prices London-Seattle

Round tripDatesPrice
London → Seattle01-05 to 13-05-2025$ 494 
London → Seattle02-09 to 16-09-2025$ 480 
London → Seattle03-09 to 16-09-2025$ 480 
London → Seattle05-09 to 19-09-2025$ 478 
London → Seattle08-09 to 17-09-2025$ 496 
London → Seattle10-09 to 27-09-2025$ 488 
London → Seattle12-09 to 21-09-2025$ 471 
London → Seattle16-09 to 23-09-2025$ 492 
London → Seattle19-09 to 29-09-2025$ 471 
London → Seattle22-09 to 26-09-2025$ 479 

When to book your flight London - Seattle to get the cheapest price?

Statistically, you will make the biggest savings by buying your plane ticket between 4 to 5 months in advance. However, you may end up paying a high price if you book between 11 to 12 months in advance.

Did you know: the price of plane tickets not only varies depending on how far in advance you book, but also on the day of the week you book! So, to maximize your chances of getting the best price for a London-Seattle flight, it is recommended to book your ticket on a sunday.

How far in advance should I buy my flight?

Created with Highcharts 8.2.2 $951 $951 $786 $786 $768 $768 $778 $778 $766 $766 $797 $797 $774 $774 $789 $789 $766 $766 $782 $782 $824 $824 $1124 $1124Average airfare price based on the number of months between booking and flight0 to 1 month1 to 2 months2 to 3 months3 to 4 months4 to 5 months5 to 6 months6 to 7 months7 to 8 months8 to 9 months9 to 10 months10 to 11 months11 to 12 months600700800900100011001200

Data analysis:

To get the cheapest flight ticket from London to Seattle, it is recommended to buy it 4 to 5 months before departure (it is then on average 766 $, which is a saving of 43 $ compared to the overall average price). On the other hand, if you buy your ticket 11 to 12 months in advance, you will pay the full price (315 $ more than the average price).

Depending on the departure month

The best time to buy your London to Seattle flight ticket may vary depending on your departure month. Therefore, we offer you statistics on when to book your flight month by month.

Departure on... How far in advance should I book?
January

Best time: 6 to 7 months before departure (average price: 664 $)

Other interesting period(s): 2 to 3 months ($ 742), 3 to 4 months ($ 720), 4 to 5 months ($ 731), 5 to 6 months ($ 729), 7 to 8 months ($ 683), 8 to 9 months ($ 679), 9 to 10 months ($ 698), 10 to 11 months ($ 743)
February

Best time: 1 to 2 months before departure (average price: 615 $)

Other interesting period(s): 2 to 3 months ($ 647), 3 to 4 months ($ 653), 4 to 5 months ($ 631), 5 to 6 months ($ 655), 6 to 7 months ($ 667), 7 to 8 months ($ 650), 8 to 9 months ($ 661), 9 to 10 months ($ 680)
March

Best time: 2 to 3 months before departure (average price: 605 $)

Other interesting period(s): 1 to 2 months ($ 683), 4 to 5 months ($ 670), 5 to 6 months ($ 642), 6 to 7 months ($ 659), 7 to 8 months ($ 686), 8 to 9 months ($ 644), 9 to 10 months ($ 648)
April

Best time: 3 to 4 months before departure (average price: 770 $)

Other interesting period(s): 1 to 2 months ($ 824), 2 to 3 months ($ 806), 4 to 5 months ($ 780), 5 to 6 months ($ 837), 6 to 7 months ($ 839)
May

Best time: 4 to 5 months before departure (average price: 621 $)

Other interesting period(s): 3 to 4 months ($ 684), 5 to 6 months ($ 686), 6 to 7 months ($ 670), 7 to 8 months ($ 637), 8 to 9 months ($ 713), 10 to 11 months ($ 700)
June

Best time: 8 to 9 months before departure (average price: 683 $)

Other interesting period(s): 4 to 5 months ($ 767), 5 to 6 months ($ 740), 6 to 7 months ($ 738), 7 to 8 months ($ 735), 9 to 10 months ($ 733), 10 to 11 months ($ 798)
July

Best time: 6 to 7 months before departure (average price: 754 $)

Other interesting period(s): 5 to 6 months ($ 870), 7 to 8 months ($ 842), 8 to 9 months ($ 837), 9 to 10 months ($ 867), 10 to 11 months ($ 915)
August

Best time: 8 to 9 months before departure (average price: 1048 $)

Other interesting period(s): 6 to 7 months ($ 1148), 7 to 8 months ($ 1058), 9 to 10 months ($ 1156), 10 to 11 months ($ 1170)
September

Best time: 8 to 9 months before departure (average price: 608 $)

Other interesting period(s): 2 to 3 months ($ 710), 7 to 8 months ($ 680), 9 to 10 months ($ 690), 10 to 11 months ($ 712)
October

Best time: 9 to 10 months before departure (average price: 665 $)

Other interesting period(s): 3 to 4 months ($ 717), 4 to 5 months ($ 697), 5 to 6 months ($ 715), 8 to 9 months ($ 705), 10 to 11 months ($ 701)
November

Best time: 5 to 6 months before departure (average price: 656 $)

Other interesting period(s): 1 to 2 months ($ 709), 2 to 3 months ($ 684), 3 to 4 months ($ 692), 4 to 5 months ($ 669), 6 to 7 months ($ 687), 9 to 10 months ($ 704), 10 to 11 months ($ 667)
December

Best time: 6 to 7 months before departure (average price: 768 $)

Other interesting period(s): 1 to 2 months ($ 819), 2 to 3 months ($ 779), 3 to 4 months ($ 775), 4 to 5 months ($ 819), 5 to 6 months ($ 798), 7 to 8 months ($ 814), 8 to 9 months ($ 833), 9 to 10 months ($ 868)

What day of the week should I book my flight ticket?

Created with Highcharts 8.2.2 $ -19 $ -19 $ -4 $ -4 $ +3 $ +3 $ +10 $ +10 $ +20 $ +20 $ -1 $ -1 $ -2 $ -2Average price of plane ticket according to the booking daysundaymondaytuesdaywednesdaythursdayfridaysaturday-30-20-100102030

Data analysis:

Statistically, sunday is the day when plane tickets for London->Seattle are the cheapest. So, by buying your plane ticket on a sunday, you will save $19. Conversely, by buying it on a thursday, you may end up paying $20 more.

London to Seattle: flight price when booking today

Information: this data is not statistics but comes from real prices collected less than 7 days ago. Some months may not be available as we do not have enough data for them.

Month Current price
April 2025$ 903
$516 to $2803		Find a flight
May 2025$ 635
$494 to $796		Find a flight
June 2025$ 758
$561 to $2481		Find a flight
July 2025$ 717
$570 to $1159		Find a flight
August 2025$ 1016
$646 to $1363		Find a flight
September 2025$ 579
$471 to $778		Find a flight
October 2025$ 753
$513 to $1472		Find a flight
November 2025$ 755
$566 to $1481		Find a flight
December 2025$ 943
$665 to $1608		Find a flight
January 2026$ 651
$575 to $718		Find a flight
February 2026$ 731
$566 to $1318		Find a flight
March 2026$ 2096
$588 to $4773		Find a flight

Data analysis:

Compared to the average price, may, june, july, august, september and january are cheaper to travel to Seattle. So it may be interesting to book now to leave during these months!

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