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Cheap flights from Seattle to London from $248

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 9/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Seattle to London

Cheap round-trip flights

Icelandair Logo
7:00 pm - 2:40 pmSEA-LGW
11h 40m1 stop
Icelandair Logo
3:40 pm - 5:50 pmLGW-SEA
34h 10m1 stop
$501Icelandair
Find Deal
Sun, Sep 28 - Tue, Oct 14
Icelandair Logo
7:00 pm - 8:20 pmSEA-LHR
17h 20m1 stop
Icelandair Logo
9:25 pm - 5:50 pmLHR-SEA
28h 25m1 stop
$501Icelandair
Find Deal
Fri, Oct 10 - Tue, Oct 21
Virgin Atlantic Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
Virgin Atlantic Logo
7:45 pm - 11:15 amLHR-SEA
23h 30m1 stop
$502Virgin Atlantic
Find Deal
Tue, Oct 14 - Thu, Oct 23
Icelandair Logo
7:00 pm - 2:40 pmSEA-LGW
11h 40m1 stop
Icelandair Logo
3:40 pm - 5:50 pmLGW-SEA
34h 10m1 stop
$502Icelandair
Find Deal
Wed, Sep 24 - Wed, Oct 15
Delta Logo
8:25 pm - 2:15 pmSEA-LHR
9h 50mnonstop
Delta Logo
11:30 am - 5:40 pmLHR-SEA
14h 10m1 stop
$508Delta
Find Deal
Wed, Sep 24 - Wed, Oct 1
Delta Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
Delta Logo
8:40 am - 4:05 pmLHR-SEA
15h 25m1 stop
$509Delta
Find Deal
Tue, Sep 9 - Tue, Sep 16
Virgin Atlantic Logo
5:45 pm - 3:40 pmSEA-LHR
13h 55m1 stop
Virgin Atlantic Logo
6:15 am - 11:15 amLHR-SEA
13h 00m1 stop
$513Virgin Atlantic
Find Deal
Wed, Sep 10 - Wed, Sep 17
British Airways Logo
8:20 pm - 1:40 pmSEA-LHR
9h 20mnonstop
British Airways Logo
9:50 am - 11:35 amLHR-SEA
9h 45mnonstop
$516British Airways
Find Deal
Sun, Oct 5 - Thu, Oct 16
British Airways Logo
2:05 pm - 12:15 pmSEA-LHR
14h 10m1 stop
British Airways Logo
2:55 pm - 4:55 pmLHR-SEA
10h 00mnonstop
$519British Airways
Find Deal
Tue, Feb 24 - Tue, Mar 3
Iberia Logo
11:42 am - 2:25 pmSEA-LHR
18h 43m1 stop
Iberia Logo
9:50 am - 11:35 amLHR-SEA
9h 45mnonstop
$520Iberia
Find Deal
Wed, Oct 8 - Fri, Oct 17

Air France flights from Seattle to Cambridge

Our best Air France deals on Seattle to Cambridge flight tickets
Air France
Sep 9
SEA8:25 pmSeattle/Tacoma Intl
9h 50m
LHR2:15 pmLondon Heathrow
Sep 23
LHR5:25 pmLondon Heathrow
10h 25m
SEA7:50 pmSeattle/Tacoma Intl
$517
Find similar
Air France
Sep 4
SEA8:25 pmSeattle/Tacoma Intl
9h 50m
LHR2:15 pmLondon Heathrow
Sep 12
LHR6:00 pmLondon Heathrow
10h 25m
SEA8:25 pmSeattle/Tacoma Intl
$566
Find similar
Air France
Sep 9
SEA8:25 pmSeattle/Tacoma Intl
9h 50m
LHR2:15 pmLondon Heathrow
Sep 22
LHR5:25 pmLondon Heathrow
10h 25m
SEA7:50 pmSeattle/Tacoma Intl
$567
Find similar

Delta flights from Seattle to Cambridge

Our best Delta deals on Seattle to Cambridge flight tickets
Delta
Sep 24
SEA8:25 pmSeattle/Tacoma Intl
9h 50m
LHR2:15 pmLondon Heathrow
Oct 1
LHR11:30 amLondon Heathrow
14h 10m
1 stop
SEA5:40 pmSeattle/Tacoma Intl
$508
Find similar
Delta
Sep 9
SEA5:35 pmSeattle/Tacoma Intl
9h 45m
LHR11:20 amLondon Heathrow
Sep 16
LHR8:40 amLondon Heathrow
15h 25m
1 stop
SEA4:05 pmSeattle/Tacoma Intl
$509
Find similar
Delta
Sep 10
SEA5:45 pmSeattle/Tacoma Intl
13h 55m
1 stop
LHR3:40 pmLondon Heathrow
Sep 16
LHR6:15 amLondon Heathrow
19h 25m
1 stop
SEA5:40 pmSeattle/Tacoma Intl
$512
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 August 28, 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

Sun 9/28

7:00 pm-2:40 pm

1 stop11h 40m

London Gatwick

Tue 10/14

3:40 pm-5:50 pm

1 stop34h 10m

$501

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 10/10

7:00 pm-8:20 pm

1 stop17h 20m

London Heathrow

Tue 10/21

9:25 pm-5:50 pm

1 stop28h 25m

$501

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/14

5:35 pm-11:20 am

Nonstop9h 45m

London Heathrow

Thu 10/23

7:45 pm-11:15 am

1 stop23h 30m

$502

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 9/24

7:00 pm-2:40 pm

1 stop11h 40m

London Gatwick

Wed 10/15

3:40 pm-5:50 pm

1 stop34h 10m

$502

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 9/24

8:25 pm-2:15 pm

Nonstop9h 50m

London Heathrow

Wed 10/1

11:30 am-5:40 pm

1 stop14h 10m

$508

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 9/9

5:35 pm-11:20 am

Nonstop9h 45m

London Heathrow

Tue 9/16

8:40 am-4:05 pm

1 stop15h 25m

$509

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 9/10

5:45 pm-3:40 pm

1 stop13h 55m

London Heathrow

Wed 9/17

6:15 am-11:15 am

1 stop13h 00m

$513

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 10/5

8:20 pm-1:40 pm

Nonstop9h 20m

London Heathrow

Thu 10/16

9:50 am-11:35 am

Nonstop9h 45m

$516

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 2/24

2:05 pm-12:15 pm

1 stop14h 10m

London Heathrow

Tue 3/3

2:55 pm-4:55 pm

Nonstop10h 00m

$519

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/8

11:42 am-2:25 pm

1 stop18h 43m

London Heathrow

Fri 10/17

9:50 am-11:35 am

Nonstop9h 45m

$520

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 $661. If you’re not able to fly to Cambridge in October, then January is your next best option. Flight prices from Seattle to Cambridge during January average around $674.

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 $699 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 8% 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 20m

Direct flights

Every day

Airports in Cambridge

1 airport
The fastest flight from Seattle to Cambridge takes 9h 20m
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
LufthansaPriceFrom $378Free CancellationRating
6.8
7,368 reviews
Search Lufthansa flights
IcelandairPriceFrom $490Free CancellationRating
7.0
537 reviews
Search Icelandair flights
Scandinavian AirlinesPriceFrom $532Free CancellationRating
7.4
1,481 reviews
Search Scandinavian Airlines flights
Air FrancePriceFrom $532Free CancellationRating
7.4
1,469 reviews
Search Air France flights
United AirlinesPriceFrom $547Free CancellationRating
7.4
8,944 reviews
Search United Airlines flights
FinnairPriceFrom $556Free CancellationRating
7.6
1,321 reviews
Search Finnair flights
British AirwaysPriceFrom $562Free CancellationRating
6.7
7,316 reviews
Search British Airways flights
DeltaPriceFrom $566Free CancellationRating
7.9
7,977 reviews
Search Delta flights
Aer LingusPriceFrom $574Free CancellationRating
7.2
1,239 reviews
Search Aer Lingus flights
IberiaPriceFrom $578Free CancellationRating
7.0
2,892 reviews
Search Iberia 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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