Beginning of main content
Trip Type
Flight 1
Flight 2
Flight 3
Flight 4
Flight 5

Search over 321,000 hotels worldwide and 400 airlines worldwide.

Secure incredible value with Expedia's Price Guarantee.

No Expedia cancellation fee to change or cancel almost any hotel reservation.

Cheap BOS to SEA Flights

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Providence

$267.60

Worcester

$650.50

Provincetown

$392.18

New Bedford

$1,445.60

Cheap BOS to SEA Flights

Question : Do travelers from Boston typically stay in Seattle for very long?
Answer : The average time spent in Seattle by passengers from Boston is about one week.

Question : Do some days of the week have more flight times than others?
Answer : When you’re flying from BOS to SEA, the day with the most flight times is Thursday, with 12 different options. However, with only nine flight times, Saturday doesn't offer quite as many options when finding that perfect departure time.

Question : What day in the next four weeks has the best fares?
Answer : Dec 5th has seen bookings (as of Nov 20th) as cheap as $226. That comes in 50% below the average price for this route. Saving on booking fees means you'll have more cash in your pocket for the trip.

Question : Is there a preferred airline for getting to Seattle-Tacoma International Airport (SEA) on time?
Answer : The current leader is Alaska Airlines with an 80% on-time rate. Spend as little time in an airport as necessary by flying with Alaska Airlines. If they are delayed for some reason though, the average delay is about half an hour.

Question : In terms of overall promptness, how does BOS to SEA rank compared to the rest of the world?
Answer : BOS to SEA currently scores 3 out of a possible 5 stars in promptness. This score combines both the number of delayed flights and total delay minutes. With 3 stars, you should feel slightly worried about getting to Seattle on time.

Question : What are the chances this flight will be delayed?
Answer : This particular route gets passengers to Seattle-Tacoma International Airport on time 74% of the time, which puts it in the 59th percentile worldwide. If a flight is late, though, expect an average of 36 minutes added to your flight time.

Question : Who's offering the cheapest round-trip flight to Seattle-Tacoma International Airport (SEA) over the coming months?
Answer : Delta Air Lines is your best bet for finding that coveted low fare. They're offering fares as low as $226, while prices for other flights are as high as $7,893.

Boston to Seattle Flights

Sometimes you just need to get out of town or maybe you’re looking for a change of scenery. Regardless of the reason, a flight from Boston to Seattle will do just the trick! Go on, plan to see all the famous landmarks and eat your weight in the local cuisine. Your trip is beckoning, so answer the call by packing your suitcase and filling your travel itinerary with exploring Seattle.

Whether you’re flying for business or jet-setting on your personal time, you’ve come to the right place. Here at Expedia.com, we’ll pair you up with BOS to SEA flights that won’t make your bank account wince. Ready to temporarily leave behind Boston for new horizons? Browse through our cheap airfare, and filter by flight times and dates until you find just what you had in mind. From flights without layovers to ones that arrive early in the morning, you’ll come across plane tickets that suit your travel preferences. You can even bundle your flight to SEA with hotels and car rentals to score even bigger savings.

All set to hit the clouds? Book your travel arrangements with us today and have left-over money to put toward your travel outings and adventures.