How many flights depart from Seattle to Cambridge on average per day?

23 flights are operational daily from Seattle to Cambridge as of August 2026. The most popular departure time for this route is 9:00PM, with 74% of flights per day taking off in the evening.

How many flights depart from Seattle to Cambridge on average per week?

As of August 2026, 167 flights take off from Seattle and land in Cambridge each week. The most common flight departure day for this route is Tue, with 15% of weekly flights taking off on this day.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Cambridge?

Icelandair, JetBlue, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Cambridge

What airlines fly to Cambridge?

Delta, British Airways and Virgin Atlantic are the top three most popular airlines that fly to Cambridge from Seattle according to our data. Delta is the first choice among our users, with 30% of people opting to fly with this airline when traveling to Cambridge. Keep in mind that there are 13 different airlines that fly to Cambridge on a routine basis, so you have a few additional options to choose from.

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?

As of August 2026, there are 13 operators available to choose from 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.

$280 Cheap Flights from Seattle to Cambridge in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:55 pm - 3:40 pmSEA Seattle/Tacoma Intl-STN London Stansted

15h 45m1 stop Kastrup Copenhagen

7:05 am - 1:45 pmSTN London Stansted-SEA Seattle/Tacoma Intl

14h 40m1 stop Kastrup Copenhagen

$647Multiple Airlines

Sun, Sep 27 - Sun, Oct 4

3:55 pm - 3:25 pmSEA Seattle/Tacoma Intl-STN London Stansted

15h 30m1 stop Kastrup Copenhagen

6:20 am - 1:45 pmSTN London Stansted-SEA Seattle/Tacoma Intl

15h 25m1 stop Kastrup Copenhagen

$648Multiple Airlines

Fri, Sep 25 - Fri, Oct 2

3:55 pm - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

18h 35m2 stops Kastrup Copenhagen Stockholm Arlanda

5:00 pm - 8:20 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

35h 20m2 stops Kastrup Copenhagen Chicago O'Hare Intl

$652Scandinavian Airlines

Fri, Oct 2 - Sun, Oct 4

3:55 pm - 5:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 45m1 stop Kastrup Copenhagen

5:30 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 15m2 stops Oslo Gardermoen Kastrup Copenhagen

$657Scandinavian Airlines

Sat, Sep 26 - Mon, Sep 28

2:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

12:15 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 45m1 stop Reykjavik Keflavik Intl

$701Icelandair

Thu, Dec 10 - Thu, Dec 31

7:00 pm - 11:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

32h 55m1 stop Reykjavik Keflavik Intl

9:25 pm - 8:40 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

31h 15m1 stop Reykjavik Keflavik Intl

$703Icelandair

Sat, Sep 26 - Sat, Oct 3

3:15 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

34h 05m2 stops Vancouver Intl Calgary

8:45 am - 9:27 amLHR London Heathrow-SEA Seattle/Tacoma Intl

32h 42m2 stops Munich Franz Josef Strauss Vancouver Intl

$722Lufthansa

Mon, Feb 1 - Thu, Feb 4

8:00 am - 5:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

25h 45m2 stops Washington, D.C. Dulles Intl Frankfurt am Main

2:30 pm - 2:37 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

32h 07m1 stop Vancouver Intl

$773Lufthansa

Wed, Jan 13 - Fri, Jan 15

2:10 pm - 2:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

16h 30m1 stop Frankfurt am Main

9:00 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 59m1 stop Munich Franz Josef Strauss

$793United Airlines

Mon, Oct 5 - Wed, Oct 7

7:05 pm - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

32h 45m1 stop Vancouver Intl

11:10 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

33h 50m1 stop Munich Franz Josef Strauss

$793United Airlines

Sat, Nov 14 - Tue, Nov 17

Cheap last minute flights

Enter your travel dates to find the best prices.

6:05 pm - 6:50 pmSEA Seattle/Tacoma Intl-LGW London Gatwick

16h 45m1 stop Frankfurt am Main

10:20 am - 4:00 pmLGW London Gatwick-SEA Seattle/Tacoma Intl

13h 40m1 stop Frankfurt am Main

$732Condor

Thu, Aug 20 - Thu, Sep 24

6:05 pm - 6:50 pmSEA Seattle/Tacoma Intl-LGW London Gatwick

16h 45m1 stop Frankfurt am Main

10:20 am - 4:00 pmLGW London Gatwick-SEA Seattle/Tacoma Intl

13h 40m1 stop Frankfurt am Main

$743Condor

Thu, Aug 20 - Fri, Sep 25

3:40 pm - 11:45 amSEA Seattle/Tacoma Intl-LGW London Gatwick

12h 05m1 stop Reykjavik Keflavik Intl

3:40 pm - 8:40 pmLGW London Gatwick-SEA Seattle/Tacoma Intl

13h 00m1 stop Reykjavik Keflavik Intl

$879Icelandair

Sat, Aug 22 - Mon, Aug 31

7:00 pm - 11:45 amSEA Seattle/Tacoma Intl-LGW London Gatwick

32h 45m1 stop Reykjavik Keflavik Intl

3:40 pm - 8:40 pmLGW London Gatwick-SEA Seattle/Tacoma Intl

13h 00m1 stop Reykjavik Keflavik Intl

$896Icelandair

Fri, Aug 21 - Fri, Aug 28

12:36 pm - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 54m2 stops Los Angeles Kastrup Copenhagen

6:40 am - 8:35 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 55m2 stops Kastrup Copenhagen Chicago O'Hare Intl

$936Scandinavian Airlines

Wed, Aug 19 - Wed, Sep 2

12:36 pm - 5:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 04m2 stops Los Angeles Kastrup Copenhagen

6:40 am - 7:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 15m2 stops Kastrup Copenhagen San Francisco

$940Scandinavian Airlines

Wed, Aug 19 - Sat, Aug 22

6:50 pm - 5:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 15m1 stop Munich Franz Josef Strauss

7:25 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

17h 34m1 stop Munich Franz Josef Strauss

$956Lufthansa

Tue, Aug 18 - Thu, Aug 27

6:50 pm - 5:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 15m1 stop Munich Franz Josef Strauss

10:50 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

14h 09m1 stop Munich Franz Josef Strauss

$957Lufthansa

Tue, Aug 18 - Tue, Sep 8

7:10 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 50m1 stop Dublin

12:00 pm - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 10m1 stop Dublin

$968Aer Lingus

Tue, Aug 18 - Thu, Aug 27

7:10 pm - 6:55 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

15h 45m1 stop Dublin

7:40 am - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

17h 30m1 stop Dublin

$974Aer Lingus

Tue, Aug 18 - Wed, Sep 30

Cheap direct flights

Enter your travel dates to find the best prices.

1:30 pm - 7:00 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 30mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$832British Airways

Tue, Nov 10 - Wed, Nov 18

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$832British Airways

Sun, Nov 15 - Fri, Nov 27

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$832Multiple Airlines

Wed, Nov 18 - Wed, Nov 25

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$832Multiple Airlines

Wed, Nov 11 - Wed, Nov 18

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:45 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 05mnonstop

$863Alaska Airlines

Mon, Nov 16 - Fri, Nov 27

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:45 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 05mnonstop

$863Alaska Airlines

Wed, Nov 18 - Fri, Nov 27

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$882Delta

Mon, Dec 7 - Wed, Dec 23

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$882Delta

Wed, Dec 9 - Wed, Dec 16

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:54 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 34mnonstop

$882KLM

Wed, Dec 9 - Fri, Dec 25

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:54 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 34mnonstop

$882KLM

Mon, Dec 7 - Wed, Dec 23

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Scandinavian Airlines flights from Seattle to Cambridge

Our best Scandinavian Airlines deals on Seattle to Cambridge flight tickets

Scandinavian Airlines

Oct 2

SEA3:55 pmSeattle/Tacoma Intl

18h 35m

2 stops

LHR6:30 pmLondon Heathrow

Oct 4

LHR5:00 pmLondon Heathrow

35h 20m

2 stops

SEA8:20 pmSeattle/Tacoma Intl

$652

Scandinavian Airlines

Sep 26

SEA3:55 pmSeattle/Tacoma Intl

17h 45m

1 stop

LHR5:40 pmLondon Heathrow

Sep 28

LHR5:30 pmLondon Heathrow

28h 15m

2 stops

SEA1:45 pmSeattle/Tacoma Intl

$657

Scandinavian Airlines

Sep 19

SEA3:55 pmSeattle/Tacoma Intl

17h 05m

2 stops

LHR5:00 pmLondon Heathrow

Sep 21

LHR7:05 amLondon Heathrow

24h 15m

2 stops

SEA11:20 pmSeattle/Tacoma Intl

$663

Lufthansa flights from Seattle to Cambridge

Our best Lufthansa deals on Seattle to Cambridge flight tickets

Lufthansa

Oct 5

SEA2:10 pmSeattle/Tacoma Intl

19h 45m

1 stop

LCY5:55 pmLondon City

Oct 7

LCY9:15 amLondon City

15h 44m

2 stops

SEA4:59 pmSeattle/Tacoma Intl

$875

Lufthansa

Aug 23

SEA7:20 pmSeattle/Tacoma Intl

34h 00m

1 stop

LHR1:20 pmLondon Heathrow

Aug 26

LHR6:30 amLondon Heathrow

15h 52m

2 stops

SEA2:22 pmSeattle/Tacoma Intl

$889

Lufthansa

Aug 23

SEA6:50 pmSeattle/Tacoma Intl

12h 50m

1 stop

LHR3:40 pmLondon Heathrow

Aug 25

LHR6:30 amLondon Heathrow

13h 25m

1 stop

SEA11:55 amSeattle/Tacoma Intl

$898

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - STN London Stansted

SEASTN

Seattle/Tacoma Intl

Sun 9/27

3:55 pm-3:40 pm

1 stop15h 45m

London Stansted

Sun 10/4

7:05 am-1:45 pm

1 stop14h 40m

$647

SeattleLondon

SEA Seattle/Tacoma Intl - STN London Stansted

SEASTN

Seattle/Tacoma Intl

Fri 9/25

3:55 pm-3:25 pm

1 stop15h 30m

London Stansted

Fri 10/2

6:20 am-1:45 pm

1 stop15h 25m

$648

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Fri 10/2

3:55 pm-6:30 pm

2 stops18h 35m

London Heathrow

Sun 10/4

5:00 pm-8:20 pm

2 stops35h 20m

$652

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Sat 9/26

3:55 pm-5:40 pm

1 stop17h 45m

London Heathrow

Mon 9/28

5:30 pm-1:45 pm

2 stops28h 15m

$657

Quickest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Thu 12/10

2:35 pm-10:50 am

1 stop12h 15m

London Heathrow

Thu 12/31

12:15 pm-5:00 pm

1 stop12h 45m

$701

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Sat 9/26

7:00 pm-11:55 am

1 stop32h 55m

London Heathrow

Sat 10/3

9:25 pm-8:40 pm

1 stop31h 15m

$703

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Mon 2/1

3:15 pm-9:20 am

2 stops34h 05m

London Heathrow

Thu 2/4

8:45 am-9:27 am

2 stops32h 42m

$722

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Wed 1/13

8:00 am-5:45 pm

2 stops25h 45m

London Heathrow

Fri 1/15

2:30 pm-2:37 pm

1 stop32h 07m

$773

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Mon 10/5

2:10 pm-2:40 pm

1 stop16h 30m

London Heathrow

Wed 10/7

9:00 am-4:59 pm

1 stop15h 59m

$793

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Sat 11/14

7:05 pm-11:50 am

1 stop32h 45m

London Heathrow

Tue 11/17

11:10 am-1:00 pm

1 stop33h 50m

$793

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

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

Prices are currently low for flights on this route.

Typical prices usually range from $712 to $987.
The lowest price recently found on this route was $647.

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 from Seattle 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 $857 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 $785 on momondo.

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

There are 4 cabin classes available to choose from on Seattle 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 15% 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	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

Frequently asked questions about flying from Seattle to Cambridge

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?
As of August 2026, there are 13 operators available to choose from 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?
momondo data reveals that the most frequently booked plane model on the route from Seattle to Cambridge is Boeing 737-800 Passenger/BBJ2 (winglets), representing 16.84% of all bookings. The subsequent popular models are Airbus A321neo at 15.00%, Boeing 737 MAX 8 at 9.06%, and Airbus A321-100/200 at 8.52%.

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
Icelandair	PriceFrom $496	Free Cancellation	Rating 6.9 731 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $500	Free Cancellation	Rating 7.3 1,708 reviews	Search Aer Lingus flights
British Airways	PriceFrom $540	Free Cancellation	Rating 6.7 8,168 reviews	Search British Airways flights
Virgin Atlantic	PriceFrom $552	Free Cancellation	Rating 7.5 694 reviews	Search Virgin Atlantic flights
United Airlines	PriceFrom $559	Free Cancellation	Rating 7.4 10,105 reviews	Search United Airlines flights
Finnair	PriceFrom $560	Free Cancellation	Rating 7.6 1,426 reviews	Search Finnair flights
Air France	PriceFrom $565	Free Cancellation	Rating 7.5 1,645 reviews	Search Air France flights
Delta	PriceFrom $566	Free Cancellation	Rating 7.8 8,502 reviews	Search Delta flights
American Airlines	PriceFrom $566	Free Cancellation	Rating 7.1 11,947 reviews	Search American Airlines flights
KLM	PriceFrom $644	Free Cancellation	Rating 7.8 1,559 reviews	Search KLM 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.