Question 1

How far in advance should I book a flight to Seattle?

Accepted Answer

You are more likely to see cheaper flights to Seattle from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $365 when searching 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 $311 on momondo.

Question 2

What cabin class options are available on Boston Logan Intl to Seattle/Tacoma Intl flights?

Accepted Answer

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.

Question 3

What is the cheapest time of day to depart on your flight to Seattle?

Accepted Answer

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 $306 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $460. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Question 4

What airlines fly to Seattle?

Accepted Answer

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 37% 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.

Question 5

What day of the week experiences the fewest flight delays on this route?

Accepted Answer

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Question 6

What is the cheapest airline that flies from Boston Logan Intl to Seattle/Tacoma Intl?

Accepted Answer

United Airlines and Alaska Airlines are the most popular carriers operating from Boston Logan Intl to Seattle/Tacoma Intl

Question 7

How often are flights from Boston to Seattle delayed?

Accepted Answer

Historically, on average around 12% of flights between Boston and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 184 minutes.

Question 8

How many flights depart from Boston to Seattle on average per day?

Accepted Answer

As of January 2026, there are 14 flights per day flying from Boston to Seattle. The most common time of day flights depart is 6:00PM, with 53% of flights taking off at noon.

Question 9

How many flights depart from Boston to Seattle on average per week?

Accepted Answer

The number of flights available between Boston and Seattle is 99 per week as of January 2026. The most frequent departure day is Sun, with 28% of weekly flights leaving on this day.

Question 10

What is the cheapest Boston Logan Intl to Seattle/Tacoma Intl flight route?

Accepted Answer

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

Question 11

How have Boston to Seattle flight prices changed over time?

Accepted Answer

As of January 2026, prices for Boston to Seattle flights are approximately 26% more expensive when compared to flights at the same time last year.

Question 12

Which airline has the best punctuality record on Boston to Seattle flights?

Accepted Answer

According to our data, Delta have had the least number of delays on this route over the last 12 months; with about 11% of their flights experiencing any sort of delay.

Question 13

What is the cheapest month to fly to Seattle?

Accepted Answer

In general, March 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 $278. If you don’t want to visit Seattle in March, then you should wait until January to fly from Boston, when ticket prices are also cheap, with an average price of $317.

Question 14

What is the most punctual flight time for Boston to Seattle flights?

Accepted Answer

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

Question 15

What is the cheapest day to depart on your flight to Seattle?

Accepted Answer

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 $399. 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 $503.

Question 16

Which airlines fly direct from Boston to Seattle?

Accepted Answer

Several airlines offer direct flights from Boston to Seattle. Some of them include Delta, Jet Blue, United Airlines, Spirit Airlines, and American Airlines. The fastest flight from Boston to Seattle takes 6h 05min with the departure airport being Boston Logan International Airport (BOS) and the arrival airport being Seattle Tacoma International Airport (SEA). If you would like to arrive at Paine Field (PAE) instead, Alaska Airlines flights have that option. You can also consider taking a single-stop flight to Seattle from Boston as American Airlines, United Airlines, and Alaska Airlines all have this option. The layover for American Airlines is at Philadelphia Airport (PHL) or Chicago O'Hare International Airport (ORD) while United Airlines have the layover at Washington Dulles Airport (IAD) or Newark Airport (EWR). The layover time is usually between 1-3 hours long.

What is the best way to get in and out of airports in Boston and Seattle?

There are various public options to get to and from Boston Logan International Airport (BOS). MBTA Silver Line Bus is a rapid transit bus service that runs between South Station and the airport or you can opt to head to the MBTA Subway and take the Blue Line subway to the airport station, which is a short walk from all terminals. Amtrak offers train service to and from Boston's South Station which is a 20-minute ride on the Silver Line bus to the airport. There are several other bus companies that provide transportation to Boston Logan International Airport, including Greyhound, Peter Pan, and Megabus. You can also opt for a private shuttle, taxi or car rental. To get to and from Paine Field Airport (PAE), you can take the Swift Green Line that runs between Everett Station and Seaway Transit Center, which is near the airport. Seattle-Tacoma International Airport (SEA) is served by the Sound Transit Link Light Rail and travelers can opt to hail a taxi or rent a car from near the airport.

What are the benefits of the different airports in Boston and Seattle?

Boston Logan International Airport (BOS) is the main airport in Boston and it offers a wide range of domestic and international flights, as well as a variety of amenities and services for travelers. On the other hand, Manchester-Boston Regional Airport (MHT) is smaller and is located about an hour's drive north of Boston which offers convenient access to New Hampshire's coast and mountains. Seattle-Tacoma International Airport (SEA) is the largest airport in the Pacific Northwest and offers easy access to Seattle's downtown area, as well as a variety of international and domestic flights. Paine Field Airport (PAE) is a smaller airport located about 23 miles north of Seattle that offers a more convenient option for travelers heading to the northern suburbs of Seattle or the nearby cities of Mukilteo and Everett. It is likely to have shorter queues at security checkpoints.

Which cities can you get to from Seattle Tacoma International Airport (SEA)?

The city of Seattle is easily accessible from SEA via the Link light rail train, which takes about 30 minutes. Tacoma is located about 30 miles south of SEA and can be reached via bus or car. Pierce Transit operates several bus routes from SEA to Tacoma, and many rental car companies offer car rentals at SEA that can be used to get to Tacoma. Bellevue is located east of Seattle and can be reached via the Link light rail train or rental car. Everett is located about 30 miles north of Seattle and can be reached via bus or car. Community Transit operates several bus routes from SEA to Everett, and rental cars are available at the airport.

Question 17

When did momondo last update prices for flights from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport?

Accepted Answer

Prices for flights from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport are updated daily.

Question 18

How many operators does momondo search for flights from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport?

Accepted Answer

As of January 2026, there are 8 operators available to choose from for flights from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport.

Question 19

How old do you have to be to fly from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport?

Accepted Answer

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.

Question 20

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

Accepted Answer

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.

Best Price Found	$202
Fastest flight time	6h 17m
Direct flights	Every day
Airports in Seattle	1 airport

Airline	Rating	Free Cancellation	Price
Hawaiian Airlines	PriceFrom $139	Free Cancellation	Rating 7.8 2,823 reviews	Search Hawaiian Airlines flights
JetBlue	PriceFrom $144	Free Cancellation	Rating 7.2 2,900 reviews	Search JetBlue flights
Delta	PriceFrom $166	Free Cancellation	Rating 7.9 8,017 reviews	Search Delta flights
Sun Country Air	PriceFrom $167	Free Cancellation	Rating 6.8 340 reviews	Search Sun Country Air flights
Alaska Airlines	PriceFrom $235	Free Cancellation	Rating 8.0 11,637 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $241	Free Cancellation	Rating 7.2 11,080 reviews	Search American Airlines flights
United Airlines	PriceFrom $250	Free Cancellation	Rating 7.4 9,138 reviews	Search United Airlines flights
Southwest	PriceFrom $256	Free Cancellation	Rating 8.0 4,247 reviews	Search Southwest flights

Cheap flights from Boston to Seattle from $155

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 2/27. 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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How to get the cheapest flight ticket from Boston to Seattle

What is the cheapest month to fly to Seattle?

What is the cheapest day to depart on your flight to Seattle?

What is the cheapest time of day to depart on your flight to Seattle?

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?

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.

How have Boston to Seattle flight prices changed over time?

As of January 2026, prices for Boston to Seattle flights are approximately 26% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Boston Logan Intl to Seattle/Tacoma Intl?

United Airlines and Alaska Airlines are the most popular carriers operating from Boston Logan Intl to Seattle/Tacoma Intl

What airlines fly to Seattle?

How often are flights from Boston to Seattle delayed?

Historically, on average around 12% of flights between Boston and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 184 minutes.

What is the most punctual flight time for Boston to Seattle flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Boston to Seattle flights?

According to our data, Delta have had the least number of delays on this route over the last 12 months; with about 11% of their flights experiencing any sort of delay.

How many flights depart from Boston to Seattle on average per day?

As of January 2026, there are 14 flights per day flying from Boston to Seattle. The most common time of day flights depart is 6:00PM, with 53% 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 99 per week as of January 2026. The most frequent departure day is Sun, with 28% 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

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How many operators does momondo search 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?

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

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What is the most popular airline from Boston to Seattle?

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