Cheap flights from Boston to Seattle from $99
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Seattle departing on 9/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Sun Country Air flights from Boston to Seattle
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Delta flights from Boston to Seattle
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How to get the cheapest flight ticket from Boston to Seattle
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
What is the typical price of a round-trip flight between Boston and Seattle?
What is the cheapest month to fly to Seattle?
In general, January is the cheapest month to fly from Boston to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $236. If you don’t want to visit Seattle in January, then you should wait until March to fly from Boston, when ticket prices are also cheap, with an average price of $279.
What is the cheapest day to depart on your flight to Seattle?
On average, the least expensive day to fly to Seattle from Boston is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $416. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Boston because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $550.
What is the cheapest time of day to depart on your flight to Seattle?
Flying to Seattle from Boston in the evening is the least expensive time of day to depart. momondo users have found prices as low as $348 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $487. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.
What is the cheapest Boston Logan Intl to Seattle/Tacoma Intl flight route?
Fly from Boston Logan Intl to Seattle/Tacoma Intl for the best Boston Logan Intl - Seattle/Tacoma Intl flight prices
How far in advance should I book a flight to Seattle?
You are more likely to see cheaper flights to Seattle from Boston when booking 7 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $353 when searching 7 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Boston for as low as $324 on momondo.
What cabin class options are available on Boston Logan Intl to Seattle/Tacoma Intl flights?
There are 4 cabin classes available to choose from on Boston Logan Intl to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Boston Logan Intl to Seattle/Tacoma Intl?
Delta, United Airlines, and Alaska Airlines are the most popular carriers operating from Boston Logan Intl to Seattle/Tacoma Intl
What airlines fly to Seattle?
Delta, JetBlue and Alaska Airlines are the top three most popular airlines that fly to Seattle from Boston 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 9 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.
How many flights depart from Boston to Seattle on average per day?
As of June 2025, there are 30 flights per day flying from Boston to Seattle. The most common time of day flights depart is 7:00AM, with 59% of flights taking off at noon.
How many flights depart from Boston to Seattle on average per week?
The number of flights available between Boston and Seattle is 214 per week as of June 2025. The most frequent departure day is Thu, with 21% of weekly flights leaving on this day.
When to book flights from Boston to Seattle
Cheap Boston to Seattle (BOS to SEA) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Boston to Seattle
How far is Boston Logan Intl to Seattle/Tacoma Intl by plane?
The straight-line distance from Boston Logan Intl to Seattle/Tacoma Intl is 2484.0 mi. Flights usually cover this in 6h 10m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport are updated daily.
How many operators does momondo search for flights from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport?
As of June 2025, there are 9 operators available to choose from for flights from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Boston to Seattle?
Based on momondo bookings for flights between Boston and Seattle, the leading plane model is Boeing 737-900 Passenger/BBJ3 (winglets), making up 21.88% of the total bookings. Other popular models include Boeing 737 MAX 9 with 19.48%, Airbus A321neo with 19.09%, and Boeing 737 with 17.41%.
What is the most popular airline from Boston to Seattle?
Based on momondo bookings for flights between Boston and Seattle, the leading airline is Delta, making up 37% of the total bookings. Other popular airlines include JetBlue with 30%, Alaska Airlines with 23%, and American Airlines with 4%.
Best airlines flying from Boston to Seattle
Compare and see reviews for airlines that fly from Boston to Seattle with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $143 | Free Cancellation | Rating 7.3 2,925 reviews | |||
| PriceFrom $153 | Free Cancellation | Rating 7.8 2,494 reviews | |||
| PriceFrom $170 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $177 | Free Cancellation | Rating 6.9 345 reviews | |||
| PriceFrom $192 | Free Cancellation | Rating 6.3 8,052 reviews | |||
| PriceFrom $219 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $226 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $228 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $351 | Free Cancellation | Rating 8.0 4,287 reviews |
Delta Flights From Boston to Seattle
Delta flies from Boston to Seattle around 18 times per week, with 7,950 momondo users rating the airline 8.0/10. The cheapest Delta deal from Boston to Seattle in the last 72 hours was $170 (round-trip), much lower than the average airfare cost of $377 for Delta flights on this route.
Alaska Airlines Flights From Boston to Seattle
The best Alaska Airlines deal for Boston to Seattle flight tickets found on momondo in the last 72 hours was $226, round-trip. It should be noted that an average Alaska Airlines flight deal for this route in this time was higher, at $439 round-trip. Alaska Airlines operates 4 flights out of Boston into Seattle in an average week, so prices vary by time and availability. 10,000 Alaska Airlines reviews by users on momondo have scored the airline at 8.0/10.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Boston to Seattle?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Boston to Seattle. momondo saves you time and could save you money on your trip.
Can I find flights from Boston to Seattle with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Boston to Seattle flights to just show those with flexible booking policies.
How can momondo help me find flights from Boston to Seattle?
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 Seattle from Boston.
I’m not ready to book a flight from Boston to Seattle right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Boston and alert you when they change.