Find cheap flights from Seattle to Boston

SEA - BOS

Find cheap flights from Seattle to Boston

Round-trip
Economy
Seattle (SEA)
Boston Logan Intl
Thu 3/4
Thu 3/11
Any month
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Good to know

Low season

January Best time to beat the crowds with an average 29% drop in price.

High season

December Most popular time to fly with an average 35% increase in price.

Average price round-trip

$291 (avg. price over the last 2 weeks)

Good deal round-trip

$237 or less

Good deal one-way

$153 or less

When to book flights from Seattle to Boston

Estimated round-trip price
Average price per month
Flight prices as travel date approaches

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $153 or less one-way and $237 or less round-trip.
  • The cheapest flight from Seattle to Boston was found 71 days before departure, on average.
  • Book at least 3 weeks before departure in order to get a below-average price.
  • High season is considered to be November, December and January. The cheapest month to fly is January.
  • Morning departure is around 23% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking flights from Seattle to Boston

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Top airlines flying Seattle/Tacoma Intl to Boston Logan Intl

Scores according to KAYAK customer reviews

5.7
Frontier
Overall score based on 39,509 reviews
6.4
Boarding
5.4
Comfort
6.8
Crew
4.6
Entertainment
4.7
Food
Airline reviews

Pros: "It got the job done"
Cons: "We were delayed about 45 minutes, which happens, I’m fine with that. I did not like that there was zero communication about it. Up until the scheduled takeoff they still hadn’t told us it would be delayed and nothing else was updated either to indicated a delay."

Cons: "The way have to bus us to the plane."

Pros: "Plane interior was bright and new."
Cons: "Baggage retrieval. Chairs don't recline."

Pros: "This airline is completely disorganized and with no apologies. I waited an hour in a bag drop line and then an hour and a half in the plane with no real explanation as to why. Planes are super bare bones which is fine. They just seem to be incredibly understaffed and unorganized as a company. All of the attendants and desk workers were trying their best but were set up for failure"
Cons: "This airline is completely disorganized and with no apologies. I waited an hour in a bag drop line and then an hour and a half in the plane with no real explanation as to why. Planes are super bare bones which is fine. They just seem to be incredibly understaffed and unorganized as a company. All of the attendants and desk workers were trying their best but were set up for failure"

Pros: "hmm"
Cons: "layover nothing was in order staff sucked yall kept moving gate yall could at lest give us a soda for the long rides"

Pros: "Nothing"
Cons: "It was a total shit-show. Only one person to check people in the counter. No kiosks were working on my way back. On the way there very few were working, I did it once, paid for my one bag, and it printed blank. There were no available workers to help me, so I switched to another kiosk and had to again, pay for my bag. On the way back we landed and had to wait 30 minutes to get to the gate. It was a horrible experience in all."

Pros: "Family emergency caused us to stay 4 more days -"
Cons: "No credit offered"

Cons: "The breaks failed on the plane so we had to deplane at the gate. They couldn't get us out until late the next day so I had to cancel my trip."

Pros: "Timely as expected"

Pros: "I sat in row 3 and had a lot of leg room. I am 6' 2" and usually have 0 leg room in most coach seating."
Cons: "There were no free snacks/soft drinks available."

Pros: "Reclining seat"
Cons: "Not having a seat in front to stretch legs out."

Cons: "None"

Cons: "No one at Frontier desk. Sign stated to check in at kiosk or online, but there were no kiosks. Online check in was unnecessarily long and onerous, and then last step couldn't be completed; advised to download app. Then had to repeat process with app. Then had to go back to desk to drop off luggage; still no one there, very long long formed, and finally when someone came to the desk the line took 20 minutes. Every other airline has figured out how to avoid this!"

Pros: "Cheap, kind of"
Cons: "No food, no water, no recline, no relax, no hospitality"

Cons: "Unexpected fees on carry ons, should be more clear about charges. Tiny trays couldn't for my snack and drinks even. Won't fly with frontier again"

Cons: "Uncomfortable and everything was delayed. Overall terrible"

Cons: "We landed early and then had to sit on the tarmac for 45 minutes for a gate. And then the jetway didn't work. So instead of getting home early for a change, I wasn't home until very late."

Cons: "It is very clear that Frontier is a budget airline that prioritizes money over people. Right down to the unnecessary announcement that you may not drink your own 'minis' but are required to purchase their liquor (at ridiculously inflated prices). The pretty girls who approached us and offered perks...for a price as we queued for more than an hour simply to check in, made me feel even more like faceless animal prey with dollars in my pockets. I will not fly Frontier again, no matter how 'cheap' their tickets."

Pros: "I got home safely"
Cons: "Both flights were over an hour and a half late. The seat designer should be arrested! Drinks and snacks were beyond "overpriced"!!"

Pros: "Fiight itself was ok"
Cons: "I did not like out of the two tickets I did buy I had to pay an additional $104.00 for seating and baggage"

Pros: "Quick boarding"
Cons: "Paying for carry on luggage."

Pros: "Nothing"
Cons: "Carry on fee?!?! WTF!!!"

Pros: "Cheap"
Cons: "Unexpected fees"

Pros: "stewardess was excellent/funny"
Cons: "too cramped. to get additional legroom it is more money."

Pros: "What is to like?"
Cons: "everything!"

Pros: "The staff was kindly and it moved swiftly."

Cons: "Hour late,"

Cons: "It is a sad state of affairs to charge $40 -45 To carry a weekend bag on board."

Pros: "The airline niceled and dimes you to death. My luggage charges were almost as much as the airfare. I will never ever fly Frontier again. The trip sucked!"
Cons: "NOTHING"

Pros: "nothing"
Cons: "everything"

Pros: "Nothing in particular stood out"
Cons: "Cost of ~49 $ extra for a carry on. This adds 90$ to trip. I would have choose another airline if I had known this was the ask."

Cons: "The hour and a half delay. Some of the passengers who were drinking were a little noisy, and used language inappropriate for the kids and the location for adult"

Pros: "Delayed 2 hours with no update information. As a frustrated passenger asked for answers. Called all over the nation for help. Upon boarding, was told Frontier had the right not to serve me. Refunded my money and then i had to book through another airline at 3am... long story short, nightmare."
Cons: "All of it."

Cons: "Showed up a day late. Oops!!!"

Pros: "Nothing"
Cons: "Everything"

Cons: "Really uncomfortable chairs that don't recline, no drink service included."

Cons: "Paying up to $60 for a carry on. Waiting on the runway for 30 minutes with no communication from the pilot when we landed in Denver."

Pros: "Pilots"
Cons: "Service"

Pros: "Cost"
Cons: "6/11/2016- stuck on Tarmac for no reason for over an hour. Missed last shuttle to Boulder due to waiting on luggage at baggage claim for another 2 hrs. Unacceptable!!!"

Cons: "Delayed forced me to rebook with different carrier last minute"

Pros: "The price and the ability to reserve a seat"
Cons: "No wifi dude"

Pros: "Nothing"
Cons: "Staff is rude, not considerate at all"

Pros: "everything was great"
Cons: "nothing"

Cons: "Should at least offer water(for free) to passengers"

Cons: "Hit a bird and had to return to the airport."

Pros: "All was good!"

Pros: "Getting off the plane."
Cons: "Everything else."

Cons: "They charged me for my carry on at the gate!"

Cons: "Bad service, expensive everything"

Pros: "No issues. It was comfortable."

Pros: "No lines"
Cons: "Spirit employees at check in"

Pros: "I enoyed my flights to Seattle and back to los Angeles"

Cons: "Spirit over chargin carry on and luggage 55.00 per carry on and 65.00 per luggage"

Pros: "The staff was friendly. That's the only good thing about my Spirit experience!"
Cons: "Everything was bad!!"

Pros: "Cheap"
Cons: "Second of two flights that were late Baggage pick up took twenty minutes..."

Pros: "The attitude's of the staff was excellent..."
Cons: "I didn't like the high prices for luggage and why I couldn't pay for my bag on line after going to your site repeatedly?!"

Pros: "It was ontime and uneventful. OTOH it was Spirit."

Pros: "Nothing"
Cons: "Cramped seating"

Cons: "So just remember that while the ticket itself might not be that expensive, you'll be charged for everything other than your personal bag, which might make up for the difference in ticket cost. Both of my flights were also delayed by about a half hour, which didn't make that much difference to my trip, but could be problematic if you have a tight layover."

Pros: "Nothing"
Cons: "Everything"

Pros: "nothing"
Cons: "everything"

Pros: "Nice to have an economic no frills option for flying. Would like them to allow a normal size carry on for free. It wouldn't be worth the price if I had to pay the large bag fees."

Cons: "Have been using the small carry-on suitcase for years boarding other airlines without any problems, it fits the Spirit case-measuring device, only the wheels were outside. I was ripped off by the gate agents for $130 for me and my daughter."

Cons: "Both flights on Spirit were delayed by an hour or more."

Cons: "Never again with spirit."

Pros: "Got a free upgrade to first seat. Super comfy!"

Cons: "Constant pitching and threatening about paying for bags. Constant yammer on the plane about offers etc. Money, Money, Money is all they talk about!!!!"

Pros: "Boarding was fast and efficient."
Cons: "The food selections for purchase were poor."

Pros: "Nothing"
Cons: "Everything"

Pros: "Nothing much"
Cons: "Paying my small luggage for 45 dollars"

Pros: "NOTHING"
Cons: "Spirit may as well charge real ticket prices instead of charging arms and legs once they've got you "on the line and in the door". I've NEVER experienced such terrible add-on charges"

Pros: "I got put into row 3 by the gate attendant! Nice wide seat, plenty of legroom. What's not to like?"

Cons: "My bag was lost and the people who work there are incompetent"

Cons: "please see my scathing 1x page long review to feedback"

Cons: "Ridiculous charges for Carry-on and checked luggage. An hour wait between landing and going to the gate. Long wait for bags to get to carrousell."

Pros: "That it was cheap."

Pros: "Boarding/seating fine."
Cons: "1 hour wait to deplane for lack of gate. Food & entertainment does not exist without charge."

Pros: "I got what I payed for. No complaints."

Pros: "If you can prepare for your trip well this works out really well."

Pros: "Got to Boston 20 minutes early"
Cons: "Planes are filthy."

Pros: "Nothing"
Cons: "No compensation, missed first day if trip, no explanation"

Pros: "50$ cheaper sounded attractive but its not worth saving that money for comfort"
Cons: "They did not even accept the electronic boarding pass from Spirit at the security and send me back for printing it"

Cons: "Everything"

Cons: "Baggage fee"

Cons: "Terrible, they charged extra for everything and not professional"

Pros: "Nothing"
Cons: "Horrible servie. Just taking money for no show. Terrible system."

Pros: "overall value"
Cons: "need more legroom, tray table was minimal"

Pros: "Big comfy seat was worth the upgrade."

Pros: "Inexpensive"
Cons: "Very cramped. No reclining. This is the city bus of airlines."

Pros: "Good rate"
Cons: "Like all"

Cons: "If you're eager for an entirely dehumanizing, infuriating travel experience, try Spirit!"

Pros: "Got where I was going in a timely fashion and at a great price point"
Cons: "Couldn't bring as much with me as I'd like, but everyone could do with a bit of simplification!"

Cons: "Spirit airlines"

Pros: "Arrived in one piece."
Cons: "Seat space nonexistent and they can't move back."

Cons: "LONG delays!"

Pros: "No hassles"
Cons: "Advertising and limited space"

Cons: "Charging $55 for a carry-on in order to make your tickets appear cheaper on sites like Kayak.com is a total scam."

Pros: "Nothing"
Cons: "Extra carry on costs Delay"

Cons: "Spirit charges 50.00 fee for checked AND carry on"

Read more about Frontier
COVID-19 information

Safety measures for airlines flying from Seattle to Boston

Airlines flying from Seattle to Boston have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from Seattle to Boston

Mandatory masks

Masks required on board, masks provided on flights from Seattle to Boston

Social distancing seating

Middle seats unavailable to book on flights from Seattle to Boston

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from Seattle to Boston

Book cheap flights from Seattle to Boston

Recent round-trip flight & train deals

5/19
Wed
1 stop
Multiple Airlines
9h 30m
SEA - BOS
5/25
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11h 34m
BOS - SEA
4/29
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9h 30m
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24h 52m
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29h 33m
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25h 27m
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24h 52m
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9h 30m
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27h 02m
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Multiple Airlines
20h 21m
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21h 18m
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15h 11m
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78h 28m
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Recent one-way flight & train deals

4/17
Sat
1 stop
Spirit Airlines
9h 30m
SEA - BOS
4/29
Thu
1 stop
Spirit Airlines
15h 11m
SEA - BOS
4/20
Tue
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Spirit Airlines
15h 11m
SEA - BOS
4/29
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12h 14m
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12h 14m
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Spirit Airlines
12h 14m
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Multiple Airlines
34h 53m
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4/8
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Multiple Airlines
29h 33m
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4/29
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Multiple Airlines
21h 40m
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Frontier
44h 36m
SEA - BOS
3/20
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Amtrak
72h 12m
EA9 - ZTY
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Amtrak
72h 20m
EA9 - ZTO
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72h 20m
EA9 - ZTO
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72h 12m
EA9 - ZTY
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Amtrak
72h 20m
EA9 - ZTO
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72h 20m
EA9 - ZTO
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72h 20m
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72h 20m
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Amtrak
72h 20m
EA9 - ZTO
3/23
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Amtrak
72h 20m
EA9 - ZTO
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Compare transportation modes for Seattle to Boston

Average price
Flights $621
Trains $426
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