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Cheap flights from Seattle to London from $344

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 2/28. 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.
Air France Logo
4:45 pm - 10:30 am
SEA
-
LHR
9h 45mnonstop
Air France Logo
6:20 am - 11:25 am
LHR
-
SEA
13h 05m1 stop
$584Air France
Wed, Jan 14 - Thu, Jan 22
Icelandair Logo
7:00 pm - 2:40 pm
SEA
-
LGW
11h 40m1 stop
Icelandair Logo
3:40 pm - 5:55 pm
LGW
-
SEA
34h 15m1 stop
$585Icelandair
Sun, Apr 5 - Sun, Apr 12
United Airlines Logo
5:00 am - 9:40 am
SEA
-
LHR
21h 40m1 stop
United Airlines Logo
1:25 pm - 7:03 pm
LHR
-
SEA
36h 38m2 stops
$585United Airlines
Wed, Mar 11 - Wed, Mar 18
Multiple Airlines Logo
8:10 am - 6:40 pm
SEA
-
STN
26h 30m2 stops
Multiple Airlines Logo
6:05 pm - 7:16 pm
STN
-
SEA
33h 11m3 stops
$586Multiple Airlines
Mon, Feb 2 - Sun, Feb 8
Lufthansa Logo
3:10 pm - 1:00 pm
SEA
-
LHR
13h 50m1 stop
Lufthansa Logo
6:30 am - 12:10 pm
LHR
-
SEA
13h 40m1 stop
$586Lufthansa
Fri, Jan 16 - Mon, Feb 2
Delta Logo
6:25 pm - 11:55 am
SEA
-
LHR
9h 30mnonstop
Delta Logo
6:30 am - 11:50 am
LHR
-
SEA
13h 20m1 stop
$588Delta
Tue, Jan 13 - Sun, Jan 18
British Airways Logo
2:25 pm - 7:00 am
SEA
-
LHR
9h 35mnonstop
British Airways Logo
2:55 pm - 5:55 pm
LHR
-
SEA
10h 00mnonstop
$590British Airways
Tue, Mar 10 - Fri, Mar 20
British Airways Logo
8:20 pm - 1:45 pm
SEA
-
LHR
9h 25mnonstop
British Airways Logo
9:50 am - 11:35 am
LHR
-
SEA
9h 45mnonstop
$593British Airways
Mon, Apr 20 - Wed, May 6
Virgin Atlantic Logo
3:10 pm - 5:20 pm
SEA
-
LCY
18h 10m1 stop
Virgin Atlantic Logo
5:50 pm - 11:50 am
LCY
-
SEA
26h 00m1 stop
$641Virgin Atlantic
Tue, Jan 20 - Tue, Jan 27
Virgin Atlantic Logo
3:10 pm - 5:20 pm
SEA
-
LCY
18h 10m1 stop
Virgin Atlantic Logo
8:05 pm - 11:50 am
LCY
-
SEA
23h 45m1 stop
$644Virgin Atlantic
Sun, Jan 18 - Sun, Jan 25

Delta flights from Seattle to Cambridge

Our best Delta deals on Seattle to Cambridge flight tickets
Delta
Feb 15
SEA4:55 pmSeattle/Tacoma Intl
9h 35m
LHR10:30 amLondon Heathrow
Feb 26
LHR6:20 amLondon Heathrow
13h 05m
1 stop
SEA11:25 amSeattle/Tacoma Intl
$584
Find similar
Delta
Dec 8
SEA4:48 pmSeattle/Tacoma Intl
9h 42m
LHR10:30 amLondon Heathrow
Dec 16
LHR6:30 amLondon Heathrow
17h 51m
2 stops
SEA4:21 pmSeattle/Tacoma Intl
$587
Find similar
Delta
Jan 13
SEA6:25 pmSeattle/Tacoma Intl
9h 30m
LHR11:55 amLondon Heathrow
Jan 18
LHR6:30 amLondon Heathrow
13h 20m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$588
Find similar

United Airlines flights from Seattle to Cambridge

Our best United Airlines deals on Seattle to Cambridge flight tickets
United Airlines
Mar 11
SEA5:00 amSeattle/Tacoma Intl
21h 40m
1 stop
LHR9:40 amLondon Heathrow
Mar 18
LHR1:25 pmLondon Heathrow
36h 38m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$585
Find similar
United Airlines
Dec 10
SEA9:25 amSeattle/Tacoma Intl
20h 05m
2 stops
LHR1:30 pmLondon Heathrow
Dec 24
LHR11:35 amLondon Heathrow
17h 42m
1 stop
SEA9:17 pmSeattle/Tacoma Intl
$602
Find similar
United Airlines
Feb 13
SEA3:40 pmSeattle/Tacoma Intl
12h 10m
1 stop
LHR11:50 amLondon Heathrow
Feb 20
LHR6:35 amLondon Heathrow
14h 45m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$603
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 December 4, 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 - LHR

SEALHR

Seattle/Tacoma Intl

Wed 1/14

4:45 pm-10:30 am

Nonstop9h 45m

London Heathrow

Thu 1/22

6:20 am-11:25 am

1 stop13h 05m

$584

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 4/5

7:00 pm-2:40 pm

1 stop11h 40m

London Gatwick

Sun 4/12

3:40 pm-5:55 pm

1 stop34h 15m

$585

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 3/11

5:00 am-9:40 am

1 stop21h 40m

London Heathrow

Wed 3/18

1:25 pm-7:03 pm

2 stops36h 38m

$585

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 2/2

8:10 am-6:40 pm

2 stops26h 30m

London Stansted

Sun 2/8

6:05 pm-7:16 pm

3 stops33h 11m

$586

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 1/16

3:10 pm-1:00 pm

1 stop13h 50m

London Heathrow

Mon 2/2

6:30 am-12:10 pm

1 stop13h 40m

$586

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 1/13

6:25 pm-11:55 am

Nonstop9h 30m

London Heathrow

Sun 1/18

6:30 am-11:50 am

1 stop13h 20m

$588

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 3/10

2:25 pm-7:00 am

Nonstop9h 35m

London Heathrow

Fri 3/20

2:55 pm-5:55 pm

Nonstop10h 00m

$590

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 4/20

8:20 pm-1:45 pm

Nonstop9h 25m

London Heathrow

Wed 5/6

9:50 am-11:35 am

Nonstop9h 45m

$593

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 1/20

3:10 pm-5:20 pm

1 stop18h 10m

London City

Tue 1/27

5:50 pm-11:50 am

1 stop26h 00m

$641

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Sun 1/18

3:10 pm-5:20 pm

1 stop18h 10m

London City

Sun 1/25

8:05 pm-11:50 am

1 stop23h 45m

$644

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 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 November is your next best option. Flight prices from Seattle to Cambridge during November average around $661.

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 $800 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?

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

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
1,591 reviews
Search Scandinavian Airlines flights
IcelandairPriceFrom $481Free CancellationRating
7.0
584 reviews
Search Icelandair flights
Aer LingusPriceFrom $500Free CancellationRating
7.2
1,384 reviews
Search Aer Lingus flights
American AirlinesPriceFrom $517Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
Air FrancePriceFrom $532Free CancellationRating
7.4
1,500 reviews
Search Air France flights
British AirwaysPriceFrom $545Free CancellationRating
6.7
7,559 reviews
Search British Airways flights
United AirlinesPriceFrom $547Free CancellationRating
7.4
9,063 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $553Free CancellationRating
8.0
11,396 reviews
Search Alaska Airlines flights
FinnairPriceFrom $556Free CancellationRating
7.6
1,334 reviews
Search Finnair flights
DeltaPriceFrom $563Free CancellationRating
7.9
8,011 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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