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Cheap flights from Seattle to London from $321

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 11/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Icelandair Logo
7:00 pm - 2:40 pmSEA-LGW
11h 40m1 stop
Icelandair Logo
3:40 pm - 8:45 pmLGW-SEA
13h 05m1 stop
$517Icelandair
Find Deal
Tue, Apr 14 - Fri, May 1
Icelandair Logo
3:45 pm - 11:55 amSEA-LHR
12h 10m1 stop
Icelandair Logo
1:05 pm - 8:45 pmLHR-SEA
15h 40m1 stop
$517Icelandair
Find Deal
Wed, Apr 1 - Wed, Apr 8
Icelandair Logo
2:35 pm - 10:55 amSEA-LGW
12h 20m1 stop
Icelandair Logo
11:55 am - 5:00 pmLGW-SEA
13h 05m1 stop
$518Icelandair
Find Deal
Fri, Jan 9 - Sun, Jan 11
Virgin Atlantic Logo
7:20 pm - 12:50 pmSEA-LHR
9h 30mnonstop
Virgin Atlantic Logo
6:20 am - 11:25 amLHR-SEA
13h 05m1 stop
$550Virgin Atlantic
Find Deal
Tue, Nov 11 - Tue, Nov 25
Virgin Atlantic Logo
7:20 pm - 12:50 pmSEA-LHR
9h 30mnonstop
Virgin Atlantic Logo
2:45 pm - 4:50 pmLHR-SEA
10h 05mnonstop
$557Virgin Atlantic
Find Deal
Tue, Nov 11 - Tue, Nov 25
Delta Logo
7:20 pm - 12:50 pmSEA-LHR
9h 30mnonstop
Delta Logo
6:20 am - 1:20 pmLHR-SEA
15h 00m1 stop
$578Delta
Find Deal
Tue, Nov 4 - Fri, Nov 14
Delta Logo
7:20 pm - 12:50 pmSEA-LHR
9h 30mnonstop
Delta Logo
6:20 am - 11:25 amLHR-SEA
13h 05m1 stop
$579Delta
Find Deal
Tue, Nov 4 - Thu, Nov 13
Finnair Logo
6:50 pm - 12:20 pmSEA-LHR
9h 30mnonstop
Finnair Logo
2:55 pm - 4:55 pmLHR-SEA
10h 00mnonstop
$587Finnair
Find Deal
Wed, Jan 7 - Thu, Jan 15
British Airways Logo
6:50 pm - 12:20 pmSEA-LHR
9h 30mnonstop
British Airways Logo
9:25 am - 11:30 amLHR-SEA
10h 05mnonstop
$588British Airways
Find Deal
Wed, Feb 18 - Fri, Feb 27
British Airways Logo
6:50 pm - 12:20 pmSEA-LHR
9h 30mnonstop
British Airways Logo
9:25 am - 11:30 amLHR-SEA
10h 05mnonstop
$594British Airways
Find Deal
Sun, Feb 15 - Tue, Mar 3

Delta flights from Seattle to Cambridge

Our best Delta deals on Seattle to Cambridge flight tickets
Delta
Oct 26
SEA5:45 pmSeattle/Tacoma Intl
9h 45m
LHR10:30 amLondon Heathrow
Nov 11
LHR6:20 amLondon Heathrow
13h 05m
1 stop
SEA11:25 amSeattle/Tacoma Intl
$577
Find similar
Delta
Nov 4
SEA7:20 pmSeattle/Tacoma Intl
9h 30m
LHR12:50 pmLondon Heathrow
Nov 14
LHR6:20 amLondon Heathrow
15h 00m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$578
Find similar
Delta
Nov 4
SEA7:20 pmSeattle/Tacoma Intl
9h 30m
LHR12:50 pmLondon Heathrow
Nov 13
LHR6:20 amLondon Heathrow
13h 05m
1 stop
SEA11:25 amSeattle/Tacoma Intl
$579
Find similar

Icelandair flights from Seattle to Cambridge

Our best Icelandair deals on Seattle to Cambridge flight tickets
Icelandair
Apr 1
SEA3:45 pmSeattle/Tacoma Intl
12h 10m
1 stop
LHR11:55 amLondon Heathrow
Apr 8
LHR1:05 pmLondon Heathrow
15h 40m
1 stop
SEA8:45 pmSeattle/Tacoma Intl
$517
Find similar
Icelandair
Nov 5
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
LGW10:55 amLondon Gatwick
Nov 14
LGW11:55 amLondon Gatwick
13h 05m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$518
Find similar
Icelandair
Nov 28
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
LGW10:55 amLondon Gatwick
Dec 11
LGW11:55 amLondon Gatwick
13h 05m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$519
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Cambridge 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, momondo users made 832,500 searches. Data last updated October 22, 2025.
Use the filters below to find and compare flights from Seattle to Cambridge that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 4/14

7:00 pm-2:40 pm

1 stop11h 40m

London Gatwick

Fri 5/1

3:40 pm-8:45 pm

1 stop13h 05m

$517

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 4/1

3:45 pm-11:55 am

1 stop12h 10m

London Heathrow

Wed 4/8

1:05 pm-8:45 pm

1 stop15h 40m

$517

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 1/9

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Sun 1/11

11:55 am-5:00 pm

1 stop13h 05m

$518

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 11/11

7:20 pm-12:50 pm

Nonstop9h 30m

London Heathrow

Tue 11/25

6:20 am-11:25 am

1 stop13h 05m

$550

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 11/11

7:20 pm-12:50 pm

Nonstop9h 30m

London Heathrow

Tue 11/25

2:45 pm-4:50 pm

Nonstop10h 05m

$557

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 11/4

7:20 pm-12:50 pm

Nonstop9h 30m

London Heathrow

Fri 11/14

6:20 am-1:20 pm

1 stop15h 00m

$578

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 11/4

7:20 pm-12:50 pm

Nonstop9h 30m

London Heathrow

Thu 11/13

6:20 am-11:25 am

1 stop13h 05m

$579

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 1/7

6:50 pm-12:20 pm

Nonstop9h 30m

London Heathrow

Thu 1/15

2:55 pm-4:55 pm

Nonstop10h 00m

$587

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 2/18

6:50 pm-12:20 pm

Nonstop9h 30m

London Heathrow

Fri 2/27

9:25 am-11:30 am

Nonstop10h 05m

$588

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 2/15

6:50 pm-12:20 pm

Nonstop9h 30m

London Heathrow

Tue 3/3

9:25 am-11:30 am

Nonstop10h 05m

$594

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Seattle to Cambridge

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Seattle and Cambridge?

What is the cheapest month to fly to Cambridge?

In general, October is the cheapest month to fly from Seattle to Cambridge. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $663. If you’re not able to fly to Cambridge in October, then August is your next best option. Flight prices from Seattle to Cambridge during August average around $677.

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

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

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

You are more likely to see cheaper flights to Cambridge from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Cambridge for around $802 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Cambridge from Seattle for as low as $705 on momondo.

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

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

Can stopping save me money on Seattle to Cambridge flights?

You could potentially save up to 4% on your flight if you consider stops on a Seattle to Cambridge flight.

Cheap Seattle to Cambridge flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Cambridge

Fastest flight time

9h 15m

Direct flights

Every day

Airports in Cambridge

1 airport
The fastest flight from Seattle to Cambridge takes 9h 15m
Direct flights go from Seattle to Cambridge every day.
There is 1 airport near Cambridge: London Heathrow (LHR)
Search flight deals

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

    Prices for flights from Seattle/Tacoma Intl Airport to Cambridge are refreshed on a daily basis.

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

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Cambridge?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Cambridge.

  • What documentation or ID do you need to fly to Cambridge?

    The necessary travel and health documents for your Cambridge trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Seattle to Cambridge?

Best airlines flying from Seattle to Cambridge

Compare and see reviews for airlines that fly from Seattle to Cambridge with momondo
Airline
Rating
Free Cancellation
Price
Scandinavian AirlinesPriceFrom $465Free CancellationRating
7.4
1,535 reviews
Search Scandinavian Airlines flights
IcelandairPriceFrom $484Free CancellationRating
7.0
560 reviews
Search Icelandair flights
Aer LingusPriceFrom $500Free CancellationRating
7.2
1,350 reviews
Search Aer Lingus flights
Air FrancePriceFrom $517Free CancellationRating
7.4
1,477 reviews
Search Air France flights
American AirlinesPriceFrom $518Free CancellationRating
7.2
11,028 reviews
Search American Airlines flights
United AirlinesPriceFrom $547Free CancellationRating
7.4
8,988 reviews
Search United Airlines flights
British AirwaysPriceFrom $547Free CancellationRating
6.7
7,466 reviews
Search British Airways flights
Alaska AirlinesPriceFrom $553Free CancellationRating
8.0
11,150 reviews
Search Alaska Airlines flights
FinnairPriceFrom $556Free CancellationRating
7.6
1,333 reviews
Search Finnair flights
DeltaPriceFrom $561Free CancellationRating
7.9
7,979 reviews
Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Cambridge?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Cambridge for you.

Can I find flights from Seattle to Cambridge with flexible booking policies on momondo?

All flight searches from Seattle to Cambridge on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Cambridge?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Cambridge from Seattle.

I’m not ready to book a flight from Seattle to Cambridge right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Seattle to Cambridge now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Cambridge and let you know when they change.

An easier way to manage your Cambridge trip

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Fri 11/21
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