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Find cheap flights from Seattle to Cambridge from $394

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Cambridge departing on 8/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Sat 6/15
Sat 6/22

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Cheapest flight

$394
Flight from Seattle to London Heathrow Airport

When to book flights from Seattle to Cambridge

Are your dates flexible? Find out the best times to travel from Seattle to Cambridge based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

FAQs for booking flights from Seattle to Cambridge

  • Which airports will I be using when flying from Seattle to Cambridge?

    When flying out of Seattle you’ll be using Seattle/Tacoma Intl. Cambridge does not have its own airport so you’ll be flying into nearby London All airports airport, which is 49.3 mi away.

  • How long does a flight from Seattle to Cambridge take?

    Direct flights cover the 4,790 miles separating Seattle and Cambridge in about 9h 20m.

  • How many flights are there between Seattle and Cambridge?

    20 direct flights run between Seattle and Cambridge on a daily basis. On average, there are about 140 departures each week.

  • What’s the cheapest day of the week to fly between Seattle and Cambridge?

    Consider leaving on a Tuesday and avoid Wednesdays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Wednesdays and the most expensive ones on Fridays.

  • How does KAYAK find such low prices on flights from Seattle to Cambridge?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Cambridge.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Cambridge?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Cambridge from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Cambridge?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Cambridge with an airline and back to Seattle with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Cambridge?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Cambridge from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which airlines provide the cheapest flights from Seattle to Cambridge?

    In the last 72 hours, the cheapest one-way ticket between Seattle and Cambridge found on KAYAK was with Icelandair for $394. SWISS offered a round-trip connection from $648 and KLM from $672.

See more FAQs

Top tips for finding cheap flights from Seattle to Cambridge

  • There is no airport in Cambridge. Instead, you’ll be flying into London All airports when flying between Seattle and Cambridge.
  • The cheapest flight from Seattle to Cambridge was found 7 days before departure, on average.
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be May, June and July. The cheapest month to fly is November.
See more tips

Top 5 airlines serving Seattle to Cambridge

 
Need help choosing which airline to fly with from Seattle to Cambridge? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 10673 reviews
8.2Boarding
8.6Crew
7.9Comfort
8.0Entertainment
7.4Food
Airline reviews

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

10.0 ExcellentSash, May 2024SEA - HNL
Read more about Delta reviews

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

Had a broken tray in business class. Crew just shrugged it off.

Everything was great except for the seat. The backrest would not stay in the upright position.

public website still broken for years randomly blocking browsers with privacy options active after loading a page maybe once. check-in on laptop was almost impossible but eventually randomly worked. had to print pass at airport since couldn't get back in to load digital pass on mobile firefox or chrome. red eye flight so smooth onboarding, plenty of room to spread out, easy offboarding. onboard wifi instructions mention vpn can cause problems connecting but fails to also mention private dns. no printed or built in menu list, seems weird to require personal device to point at qr code link for menu which does not even allow direct ordering. people with health condition risk related dietary restrictions trying to avoid for example cholesterol and sugar are left guessing what they can order either way without nutritional info highlights (cranberry juice was minute maid cocktail with as much suger as typical can of soda). tap to pay wasn't working and always seems sketchy to manually enter card info. good movie variety, so limited tv was okay.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Mi primera conexión se retrasó por lo cual perdí mi segunda conexión la cual salió adelantada

Crew was not friendly when I went to request a seat change.

There were choices for the snacks. Good choices and tasty lunch and breakfast as well.

The flight crew was amazing. I’m very tall and they moved me to an exit row unsolicited!!! Amazing service.

Cabin crew on our flight showed lack of any customer service gruff and acting annoyed if you asked anything and I mean anything Example a man on the seat over dropped his beer on my husbands blanket We asked if we could switch out blankets cabin crew Said. No we don’t have any extras OK well can you take the wet one Cabin crew looked disgusted and annoyed Took it no OK or yes just a growl

Quick flight. But cabin crew were very noisy and talking too much, especially when we were seated at the back of the plane trying to sleep through the night .

My ticket was for Premium Economy and all the seats were taken, I was placed in Economy class and I’m looking for a refund.

Unfortunately delayed 2 hrs due to faulty tyre.. which had to be changed, but better safe than sorry.

The delay was an issue. Other than that. Every thing good

Hi vergin Atlantic service was good but the flight ticket agent travel up charge me extra 57 pounds as a airport charges, actually I refuse to pay but they say if I not pay £57 then they say you will not be able to travel from Heathrow to goa ,so for me there was no option and it was just 3 day before my departure so i paid, so please look in to the matter. And I have a receipt of £ 57 as well .thanks

Staff didn’t check cabin well for landing seemed more interested in chatting to each other. Food was poor and differed from pre order.

We were in the last group to be called to the flight - which was 30 minutes late taking off. While we were lucky enough to have been given bulkhead seats (due to a medical condition I’d told them about beforehand) the seats weren’t particularly comfortable. A crying baby for the whole trip made things worse, so the crew managed very well with coping. The final thing I’d say was that there wasn’t enough food served during the flight.

We flew Upper Class from London to The Turks and Caicos. Check in was amazing. Our ldriver too us directly to a special entrance to terminal 3. It took 10 minutes to check in and clear customs. Amazing! The VA lounge is large and comfortable. Boarding the flight was easy and without a wait. The crew was excellent. But the seats were awful, strange and uncomfortable. Having a comfortable flat bed seat is the reason we pays 1000s extra. The VA 787 uses a reverse herringbone configuration. Look it up. You have your back to the window and are facing the aisle with no privacy. Turning the seat into a bed requires assistance from the crew so not very spontaneous. . The food was ok. A bit tasteless and meager portions. Had to pay for WiFi. I believe VA has other configuration on their dream airbus flights. Lots of stuff about all this on YouTube where you can see what I have been describing. I can not recommend taking VA on a long flight with these seats.

From the start everything was perfectly fine. First meal was fantastic. Breakfast needs a lot of work and food was overcooked and not very nice for breakfast. Staff were fantastic friendly nice they came round and check we need anything else to eat or drink

Seats comfortable on economy plus and attendants very helpful. Food was ok. Bathrooms needed servicing.

Original flight was cancelled - After waiting 2 hours for new take-off times. Then had to stand in line for 3 hours, ending at 2:30 am - to be told, " No hotel rooms anywhere in Dallas". No way for me to get any rest at DFW at that time of night.

I liked the friendly crew and desk staff, all very helpful. I was surprised and a little annoyed on my outbound flight from LGW to MCO as I had prepaid and booked my seat, which was all correct at check in on my boarding pass. when I got on the plane someone was in my seat ! I was moved to another seat. The food choice is quite limited and I feel that an option of a muffin for breakfast snack would be welcomed, not everyone wants egg or bacon wrap. The choice of entertainment is good, plenty to keep you busy on a long haul flight. I liked the option offered to have the cabin bag checked into the hold, it saved me as an older, lone traveller lifting my case into the overhead locker or finding there was no space.

good service from crew. Before the would have an option between cookies or nuts as snacks.. Now, there are only cookies. too bad. People who can not have sugar don't have a choice.

I’m hoping for WiFi included. Everything else was very good

Seats, comfort level ugh. Crew was not attentive, only to coach

All corners have been cut and it’s a cheap experience that no longer is distinguished from most other cheap airlines

Pros: they tried to accommodate bc they forgot my gluten free meal Negatives: The flight was freeeeeezing Iberia didn’t communicate my gluten free meal

Rude security cunts. However the lady that issued my boarding ticket when I was flying back from New York was lovely & helpful!!

Appalling! The flight was delayed by 3.5 hours and the American Airlines staff at the airport where nit very helpful. Once boarded, the flight crew were unhelpful, the food was poor and the aircraft was tatty.

Decent service - nice seats. Crew were not overly attentive but can’t complain overall for the money

Very nice flight, easy connections in Keflavík, and friendly crew.

I will never fly this airline again. Checking in was poor , we had to go back to the check in counter at Raleigh - Durham international airport three times because they didn’t issue my boarding pass but rather duplicated my husband’s twice which caused a big headache at the passport control at the airport which triggered security alert and wouldn’t let us pass through we we had to wait for long time to be able to explain and clear everything after talking to the supervisor.. No food on the plane , not even crackers. No food was offered to buy ether . No ear phone was provided . Very little time to make from one plane to another and nobody to assist with smooth transition. Flight itself , we felt safe so thank you to the pilots . But customer service was terrible . We spent $ 2500 on 2 tickets, so I cannot say that service was consistent with the price .

Seats are way too much now with these new airplanes especially long flights like we had. I was 7 month pregnant and in a lot of discomfort due to small seats.

Food was horrible. This wasn’t business class. No leg space, can’t sleep in row position, huge delay

I liked how easy my transfers between flights in Keflavik were. I would have appreciated more food options in Keflavik.

The plane was flaming hot! Could not breathe. Everyone coughing from heat. Awful.

My biggest problem was the flight from KEF to DUB was delayed, which caused me to miss my connecting flight in DUB and we were forced into an unplanned 10-hour layover in DUB. Crew and boarding staff were all very friendly but this was a real inconvenience and especially uncomfortable for my disabled wife.

Not much! This was my first flight with Iceland air and unfortunately it wasn’t what I have expected. My luggage is lost nothing as of yet where it was left. Not a good service at all!!

The seat size was more like a domestic than an international flight. In fact, i would compare the ammenities, quality and service to a short hall ryan air flight, which was unexpected for an international flight. The plane was extremely hot so sleeping was difficult. My biggest complaint was that they are very strict on carry on luggage only allowing it to weigh 10kg/22lb. I try to limit myself to a carryon so i don't have to mess with bagage claim, but the wieght restriction made it impossible. I have never had a carry on weight restriction (at least enforced) on an international flight. Will not be including them in future searches.

- OK plane. Basic accommodations. OK food. The digital window shade wasn't working.

- OK plane. Basic accommodations. OK food. The digital window shade wasn't working. - Expect to be woken up more than an hour before landing when they start dinging the bell and making announcements and turning on all cabin lights to serve a snack. I would prefer they remain quiet and only serve people who want to wake up.

Better food and more space in the seats. Also when doing the web check in both times I was going in to your site the minute you open it and there is not really many seats to choose only to buy!!!

It was ok, not as good as it used to be. The Heathrow connection was a disaster - complete anarchy, unknowledgable and skimpy assistance and signage. Gate crew at next flight was great, held the flight while my wife struggled through security.

It was great! The seats were comfortable, and they fed me during the transatlantic flight, something which I have been missing out on for the past 3 years as I travel to and from school.

This flight was cancelled at the last minute. We were rebooked on another flight but a day later. We lost a day of our vacation and paid for a night in a hotel we couldn’t use. The flights we were rebooked on (both American) messed up our seating on both flights-we didn’t get the seats we had paid for. All in all, a terrible experience.

Lost our bags in Heathrow, We didn’t receive bags in Mallorca for 3 days, out of a 7 day cycling vacation. Really inconvenient and disappointing!

We missed the flight to Barcelona because the flight from Baltimore was delayed. We flew on Vueling VW6653. Our luggage didn’t arrive. Please help us get our luggage. We are staying at Hotel Gran Via in Barcelona

The seats were tiny, being of a fairly petite build, I don’t usually expect to feel crammed and cramped in a seat, but I definitely was on this flight. I couldn’t even bend over to get anything out from under the seat in front and getting up to go to the bathroom at night with the seat backs reclined was nearly impossible. I had to do gymnastics to get over and out. For an airline that does long flights overnight, it’s kind of ridiculous.

In economy and food was ok, but with limited leg space (and I was in a 2 seat configuration) it was difficult to eat with a tiny seat tray. I spilt wine on my trousers. First time on British Air (I usually fly Turkish Air) and in a 777. Heathrow was pleasant but changing terminals awkward.

Book cheap flights from Seattle to Cambridge

Recent round-trip flight deals

10/8Tue
2 stopsSWISS
20h 15mSEA-LCY
10/22Tue
2 stopsSWISS
17h 01mLCY-SEA
$648
9/24Tue
2 stopsSWISS
17h 00mSEA-LCY
10/9Wed
2 stopsSWISS
37h 21mLCY-SEA
$653
8/11Sun
1 stopIcelandair
28h 45mSEA-LGW
8/26Mon
1 stopIcelandair
30h 20mLGW-SEA
$719
7/10Wed
1 stopVirgin Atlantic
14h 45mSEA-LGW
10/6Sun
1 stopVirgin Atlantic
18h 20mLGW-SEA
$721
8/5Mon
1 stopIcelandair
17h 25mSEA-LHR
9/18Wed
1 stopIcelandair
12h 50mLHR-SEA
$725
8/8Thu
nonstopVirgin Atlantic
9h 35mSEA-LHR
9/19Thu
1 stopVirgin Atlantic
13h 05mLHR-SEA
$736
8/11Sun
nonstopDelta
9h 35mSEA-LHR
9/22Sun
nonstopDelta
9h 55mLHR-SEA
$742
8/11Sun
nonstopBritish Airways
9h 20mSEA-LHR
8/30Fri
nonstopBritish Airways
9h 45mLHR-SEA
$745
8/6Tue
1 stopDelta
15h 25mSEA-LHR
8/31Sat
nonstopDelta
10h 25mLHR-SEA
$747
8/11Sun
nonstopBritish Airways
9h 20mSEA-LHR
9/20Fri
nonstopBritish Airways
9h 45mLHR-SEA
$759

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Recent one-way flight deals

8/10Sat
1 stopIcelandair
13h 20mSEA-LHR
$394
7/18Thu
1 stopIcelandair
28h 45mSEA-LGW
$395
8/4Sun
3 stops
38h 00mSEA-LTN
$396
7/17Wed
1 stopDelta
14h 45mSEA-LGW
$627
7/22Mon
1 stopBritish Airways
14h 45mSEA-LCY
$646
7/6Sat
1 stopBritish Airways
30h 54mSEA-LGW
$656
6/16Sun
nonstopIberia
9h 20mSEA-LHR
$667
6/24Mon
nonstopVirgin Atlantic
9h 40mSEA-LHR
$669
7/2Tue
nonstopVirgin Atlantic
9h 20mSEA-LHR
$670
8/11Sun
1 stopDelta
12h 00mSEA-LCY
$672

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Last minute flights from Seattle to Cambridge

Last minute flight, train and bus deals

5/20Mon
multi-stopLufthansa
16h 10mSEA-LHR
6/10Mon
multi-stopLufthansa
31h 09mLHR-SEA
$756
5/20Mon
multi-stopLufthansa
16h 10mSEA-LHR
6/11Tue
multi-stopLufthansa
14h 09mLHR-SEA
$757
5/21Tue
nonstopDelta
9h 20mSEA-LHR
5/28Tue
multi-stopDelta
16h 40mLHR-SEA
$763
5/21Tue
nonstopDelta
9h 40mSEA-LHR
5/31Fri
multi-stopDelta
13h 05mLHR-SEA
$764
5/19Sun
nonstopVirgin Atlantic
9h 20mSEA-LHR
6/4Tue
nonstopVirgin Atlantic
10h 20mLHR-SEA
$772
5/20Mon
nonstopVirgin Atlantic
9h 40mSEA-LHR
6/10Mon
multi-stopVirgin Atlantic
25h 45mLHR-SEA
$776
5/20Mon
nonstopBritish Airways
9h 20mSEA-LHR
6/5Wed
nonstopBritish Airways
9h 45mLHR-SEA
$963
5/20Mon
nonstopBritish Airways
9h 20mSEA-LHR
6/5Wed
multi-stopBritish Airways
16h 22mLHR-SEA
$973
5/21Tue
multi-stopIcelandair
28h 56mSEA-LGW
6/4Tue
multi-stopIcelandair
12h 40mLGW-SEA
$1,200
5/20Mon
multi-stopIcelandair
16h 19mSEA-LGW
6/7Fri
multi-stopIcelandair
12h 40mLGW-SEA
$1,260

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