Cheap flights from Massachusetts to Seattle from $174

In general, March is the cheapest month to fly from Massachusetts to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $355. If you don’t want to visit Seattle in March, then you should wait until January to fly from Massachusetts, when ticket prices are also cheap, with an average price of $376.

On average, the least expensive day to fly to Seattle from Massachusetts is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $455. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from Massachusetts because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $583.

Flying to Seattle from Massachusetts in the evening is the least expensive time of day to depart. momondo users have found prices as low as $431 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $527. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Boston Logan Intl to Seattle/Tacoma Intl for the best Massachusetts - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from Massachusetts when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $426 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Massachusetts for as low as $390 on momondo.

There are 4 cabin classes available to choose from on Massachusetts to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Southwest, Alaska Airlines, and Delta are the most popular carriers operating from Massachusetts to Seattle/Tacoma Intl

Delta, Alaska Airlines and JetBlue are the top three most popular airlines that fly to Seattle from Massachusetts according to our data. Delta is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 8 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

The number of flights available between Massachusetts and Seattle is 20 per day as of September 2026. The most frequent departure time is 7:00PM, with 47% of daily flights leaving at noon.

The number of flights available between Massachusetts and Seattle is 145 per week as of September 2026. The most frequent departure day is Mon, with 23% of weekly flights leaving on this day.