Cheap flights from Seattle to Boston from C$ 172
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Boston departing on 2/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names, great deals
Big names, great deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Early arrival? Instantly customize your resultsTrusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from Seattle to Boston
Cheap round-trip flights
Cheap one-way flights
Cheap last-minute flights
Cheap direct flights
Alaska Airlines flights from Seattle to Boston
Our best Alaska Airlines deals on Seattle to Boston flight tickets
JetBlue flights from Seattle to Boston
Our best JetBlue deals on Seattle to Boston flight tickets
See travel insights to Boston from
How to get the cheapest flight ticket from Seattle to Boston
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 cheapest month to fly to Boston?
The cheapest month to fly to Boston from Seattle is in January. Flight prices, which tend to average around C$ 302, are often lower during this time because this is during the off-season. If you are unable to visit Boston during the month of January, then departing from Seattle during the month March is also very affordable. Most momondo users find prices during this month for around C$ 371.
What is the cheapest day to depart on your flight to Boston?
On average, the least expensive day to fly to Boston from Seattle is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as C$ 463. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from Seattle to Boston on a Monday will generally be more expensive and average around C$ 1,409. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Boston?
Flying to Boston from Seattle at noon is the least expensive time of day to depart. momondo users have found prices as low as C$ 0 when looking at flights departing at noon. Flights in the morning are often more expensive with an average ticket price of C$ 737.
What is the cheapest Seattle/Tacoma Intl to Boston Logan Intl flight route?
Fly from Seattle/Tacoma Intl to Boston Logan Intl for the best Seattle/Tacoma Intl - Boston Logan Intl flight prices
How far in advance should I book a flight to Boston?
You are more likely to see cheaper flights to Boston from Seattle when booking 14 weeks ahead of your departure date. In general, you can expect to find flights to Boston for around C$ 523 when searching 14 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boston from Seattle for as low as C$ 489 on momondo.
What cabin class options are available on Seattle/Tacoma Intl to Boston Logan Intl flights?
There are 2 cabin classes available to choose from on Seattle/Tacoma Intl to Boston Logan 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 Seattle/Tacoma Intl to Boston Logan Intl?
Delta, Alaska Airlines, and JetBlue are the most popular carriers operating from Seattle/Tacoma Intl to Boston Logan Intl
Which airlines fly to Boston?
Alaska Airlines, Delta and JetBlue are the top three most popular airlines that fly to Boston from Seattle according to our data. Alaska Airlines is the first choice among our users, with 47% of people opting to fly with this airline when travelling to Boston. Keep in mind that there are 3 different airlines that fly to Boston on a routine basis, so you have a few additional options to choose from.
How many flights depart from Seattle to Boston on average per day?
As of April 2025, there are 23 flights per day flying from Seattle to Boston. The most common time of day flights depart is 3:00p.m., with 37% of flights taking off in the evening.
How many flights depart from Seattle to Boston on average per week?
The number of flights available between Seattle and Boston is 162 per week as of April 2025. The most frequent departure day is Thu, with 20% of weekly flights leaving on this day.
When to book flights from Seattle to Boston
Cheap Seattle to Boston (SEA to BOS) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Boston
How far is Seattle/Tacoma Intl to Boston Logan Intl by plane?
A flight from Seattle/Tacoma Intl to Boston Logan Intl will travel around 3997.7 km. Typically, this will take 5h 16m by plane in normal conditions.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport were last updated today.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport?
As of April 2025, there are 3 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport.
What documentation or ID do you need to fly to Boston Logan Intl Airport?
The required travel and health documents for your Boston Logan Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Boston Logan Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Seattle to Boston?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Seattle to Boston is Airbus A321neo (23.77% of total bookings). The next most popular plane models are Boeing 737 (20.86%), Airbus A318/A319/A320/A321 (13.69%), and Boeing 737-900 Passenger/BBJ3 (winglets) (12.39%).
What is the most popular airline from Seattle to Boston?
Based on momondo bookings for flights between Seattle and Boston, the leading airline is Alaska Airlines, making up 47% of the total bookings. Other popular airlines include Delta with 31% and JetBlue with 22%.
Best airlines flying from Seattle to Boston
Compare and see reviews for airlines that fly from Seattle to Boston with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom C$ 164 | Free Cancellation | Rating 8.0 7,916 reviews | |||
| PriceFrom C$ 179 | Free Cancellation | Rating 7.3 2,926 reviews | |||
| PriceFrom C$ 198 | Free Cancellation | Rating 8.0 9,887 reviews |
Delta Flights From Seattle to Boston
Delta flies from Seattle to Boston around 16 times per week, with 7,917 momondo users rating the airline 8.0/10. The cheapest Delta deal from Seattle to Boston in the last 72 hours was C$ 118 (round-trip), much lower than the average airfare cost of C$ 283 for Delta flights on this route.
Alaska Airlines Flights From Seattle to Boston
Alaska Airlines is also a popular choice for this route. Alaska Airlines flight deals for Seattle to Boston start from as low as C$ 142 round-trip, depending on your selected dates, with average Alaska Airlines deals seen on momondo around C$ 397. Alaska Airlines operates 10 flights to Boston from Seattle in an average week. Users have rated it 8.0/10 across 9,882 reviews.
Travelling to a place near Boston?
Book flights to Boston if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Seattle to Boston?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Boston for you.
Can I find flights from Seattle to Boston with flexible booking policies on momondo?
Yes. All flights to Boston from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Seattle to Boston?
Once all potential Seattle to Boston flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Seattle to Boston right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of Seattle to Boston flights. All you need is a valid email address and we will do the rest; it is that quick and easy.