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Cheap flights from Seattle to London from $372

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 2/11. 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

Enter your travel dates to find the best prices.
Icelandair Logo
3:40 pm - 2:40 pm
SEA
-
LGW
15h 00m
1 stop
Icelandair Logo
3:40 pm - 8:40 pm
LGW
-
SEA
13h 00m
1 stop
$542Icelandair
Wed, Apr 22 - Thu, Apr 30
Icelandair Logo
3:40 pm - 11:55 am
SEA
-
LHR
12h 15m
1 stop
Icelandair Logo
1:05 pm - 5:55 pm
LHR
-
SEA
12h 50m
1 stop
$542Icelandair
Wed, Apr 15 - Fri, Apr 24
Multiple Airlines Logo
2:35 pm - 6:20 pm
SEA
-
STN
19h 45m
2 stops
Multiple Airlines Logo
6:30 am - 6:00 pm
STN
-
SEA
18h 30m
2 stops
$543Multiple Airlines
Tue, Mar 3 - Tue, Mar 10
Multiple Airlines Logo
3:35 pm - 9:20 pm
SEA
-
LHR
22h 45m
2 stops
Multiple Airlines Logo
6:40 am - 5:55 pm
LHR
-
SEA
43h 15m
2 stops
$543Multiple Airlines
Mon, Mar 16 - Sun, Mar 29
Icelandair Logo
3:35 pm - 10:55 am
SEA
-
LGW
12h 20m
1 stop
Icelandair Logo
3:40 pm - 5:55 pm
LGW
-
SEA
34h 15m
1 stop
$543Icelandair
Tue, Mar 17 - Wed, Apr 1
Virgin Atlantic Logo
3:05 pm - 5:20 pm
SEA
-
LCY
18h 15m
1 stop
Virgin Atlantic Logo
5:50 pm - 12:35 pm
LCY
-
SEA
25h 45m
1 stop
$652Virgin Atlantic
Mon, Feb 23 - Mon, Mar 9
Virgin Atlantic Logo
3:05 pm - 5:20 pm
SEA
-
LCY
18h 15m
1 stop
Virgin Atlantic Logo
5:05 pm - 11:35 am
LCY
-
SEA
26h 30m
1 stop
$655Virgin Atlantic
Tue, Feb 24 - Tue, Mar 3
SWISS Logo
12:32 pm - 5:05 pm
SEA
-
LCY
20h 33m
2 stops
SWISS Logo
9:15 am - 9:01 pm
LCY
-
SEA
19h 46m
2 stops
$668SWISS
Tue, Feb 24 - Tue, Mar 3
KLM Logo
1:45 pm - 9:30 am
SEA
-
LCY
11h 45m
1 stop
KLM Logo
9:20 am - 4:30 pm
LCY
-
SEA
15h 10m
1 stop
$669KLM
Mon, Apr 6 - Thu, May 7
KLM Logo
1:45 pm - 9:30 am
SEA
-
LCY
11h 45m
1 stop
KLM Logo
10:00 am - 4:30 pm
LCY
-
SEA
14h 30m
1 stop
$670KLM
Mon, Apr 6 - Thu, Apr 23

Icelandair flights from Seattle to Cambridge

Our best Icelandair deals on Seattle to Cambridge flight tickets
Icelandair
Apr 15
SEA3:40 pmSeattle/Tacoma Intl
12h 15m
1 stop
LHR11:55 amLondon Heathrow
Apr 24
LHR1:05 pmLondon Heathrow
12h 50m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$542
Icelandair
Mar 17
SEA3:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
LGW10:55 amLondon Gatwick
Apr 1
LGW3:40 pmLondon Gatwick
34h 15m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$543
Icelandair
Apr 1
SEA3:40 pmSeattle/Tacoma Intl
12h 15m
1 stop
LHR11:55 amLondon Heathrow
Apr 12
LHR9:25 pmLondon Heathrow
31h 15m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$544

Delta flights from Seattle to Cambridge

Our best Delta deals on Seattle to Cambridge flight tickets
Delta
Feb 10
SEA1:38 pmSeattle/Tacoma Intl
12h 22m
1 stop
LHR10:00 amLondon Heathrow
Feb 17
LHR6:30 amLondon Heathrow
13h 10m
1 stop
SEA11:40 amSeattle/Tacoma Intl
$721
Delta
Feb 10
SEA1:38 pmSeattle/Tacoma Intl
12h 22m
1 stop
LHR10:00 amLondon Heathrow
Feb 17
LHR12:20 pmLondon Heathrow
10h 25m
SEA2:45 pmSeattle/Tacoma Intl
$749
Delta
Feb 11
SEA3:05 pmSeattle/Tacoma Intl
17h 30m
1 stop
LCY4:35 pmLondon City
Feb 16
LCY10:00 amLondon City
33h 40m
1 stop
SEA11:40 amSeattle/Tacoma Intl
$752

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 January 29, 2026.
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

Wed 4/22

3:40 pm-2:40 pm

1 stop15h 00m

London Gatwick

Thu 4/30

3:40 pm-8:40 pm

1 stop13h 00m

$542

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 4/15

3:40 pm-11:55 am

1 stop12h 15m

London Heathrow

Fri 4/24

1:05 pm-5:55 pm

1 stop12h 50m

$542

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Tue 3/3

2:35 pm-6:20 pm

2 stops19h 45m

London Stansted

Tue 3/10

6:30 am-6:00 pm

2 stops18h 30m

$543

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 3/16

3:35 pm-9:20 pm

2 stops22h 45m

London Heathrow

Sun 3/29

6:40 am-5:55 pm

2 stops43h 15m

$543

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 3/17

3:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Wed 4/1

3:40 pm-5:55 pm

1 stop34h 15m

$543

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Mon 2/23

3:05 pm-5:20 pm

1 stop18h 15m

London City

Mon 3/9

5:50 pm-12:35 pm

1 stop25h 45m

$652

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 2/24

3:05 pm-5:20 pm

1 stop18h 15m

London City

Tue 3/3

5:05 pm-11:35 am

1 stop26h 30m

$655

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 2/24

12:32 pm-5:05 pm

2 stops20h 33m

London City

Tue 3/3

9:15 am-9:01 pm

2 stops19h 46m

$668

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Mon 4/6

1:45 pm-9:30 am

1 stop11h 45m

London City

Thu 5/7

9:20 am-4:30 pm

1 stop15h 10m

$669

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Mon 4/6

1:45 pm-9:30 am

1 stop11h 45m

London City

Thu 4/23

10:00 am-4:30 pm

1 stop14h 30m

$670

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 $647. 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 $650.

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 $783 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 $676 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?

No. A direct flight is the cheapest option for a flight between Seattle to Cambridge.

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

6 airports
The fastest flight from Seattle to Cambridge takes 9h 15m
Direct flights go from Seattle to Cambridge every day.
There are 6 airports in Cambridge. From Seattle there are direct flights to 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
7.3
1,674 reviews
Search Scandinavian Airlines flights
IcelandairPriceFrom $483Free CancellationRating
7.1
606 reviews
Search Icelandair flights
Aer LingusPriceFrom $500Free CancellationRating
7.2
1,443 reviews
Search Aer Lingus flights
American AirlinesPriceFrom $517Free CancellationRating
7.2
11,205 reviews
Search American Airlines flights
Air FrancePriceFrom $532Free CancellationRating
7.4
1,528 reviews
Search Air France flights
British AirwaysPriceFrom $535Free CancellationRating
6.7
7,705 reviews
Search British Airways flights
United AirlinesPriceFrom $547Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $553Free CancellationRating
8.0
11,807 reviews
Search Alaska Airlines flights
FinnairPriceFrom $556Free CancellationRating
7.6
1,356 reviews
Search Finnair flights
DeltaPriceFrom $558Free CancellationRating
7.9
8,128 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.

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