$204 Find Cheap Flights from Seattle to Boston - Compare and Save

These are the earliest and latest flight times available from Seattle to Boston:

• Earliest: departs at 7:15 am and lands at 12:41 pm
• Latest: departs at 11:59 pm and lands at 5:25 am.

The flight takes about 5h 26m.

Four cabin classes are available on flights from Seattle to Boston:

• Economy Class
• Premium Economy Class
• Business Class
• First Class

Prices vary by airline.

A nonstop flight from Seattle to Boston takes 5h 26m, covering 2,487 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Round-trip flights from Seattle to Boston range from $353 to $568, with an average of $446 over the past 12 months. Anything below $353 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 38% above the $446 route average. Book 25 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $258 round-trip via Baltimore/Washington (BWI), compared to $449 for nonstop.

Delta is slightly above the route average for timely arrivals, while Alaska Airlines has a lower on-time arrival rate. On-time arrival rates on Seattle to Boston flights are:

• Delta: 88% on time
• Alaska Airlines: 85% on time
• JetBlue: 58% on time

Overall, flights on this route are punctual 83% of the time on average.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $35–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Airbus A321-100/200 family is used most often on this route, operated mainly by JetBlue and Delta. Other aircraft seen on the route include Airbus A321neo variants.

Morning is the busiest departure period on Seattle to Boston flights, with 43% of flights leaving in that window. Afternoon departures account for 29%, night flights for 28%, and evening flights for 0%.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $319 to $1,942. That means the highest observed fare was about 6x higher than the lowest one.

Three airlines offer in-flight Wi-Fi on Seattle to Boston flights:

• JetBlue
• Delta
• Alaska Airlines

Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

One-way fares from Seattle to Boston are currently lower than usual. Average one-way flight prices are about $208, which is 25% below the typical average for this route.

Boston Logan Intl Airport (BOS) hosts 5 major car rental companies, with daily rates starting from around $23 for economy cars. Top options include:

• Dollar
• Hertz
• Budget
• Thrifty
• Sixt

Flights from Seattle to Boston usually depart from Seattle/Tacoma Intl (SEA) and arrive at Boston Logan Intl (BOS).

Night flights have the fewest delays on this route, while morning departures tend to have the most.

A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the Seattle to Boston route, 17% of flights were delayed in the past 3 months, with delays averaging 2h 59m.

One-stop flights from Seattle to Boston most commonly connect through:

• Minneapolis St Paul (MSP) - 37% of one-stop connections
• Chicago O'Hare Intl (ORD) - 23% of one-stop connections
• Philadelphia (PHL) - 15% of one-stop connections
• Chicago Midway (MDW) - 8% of one-stop connections

Yes. Flexible dates can save you up to 22% on flights from Seattle to Boston. Tuesday is the cheapest departure day at $401 round-trip on average, while Sunday is the most expensive at $512, a difference of $111.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

3 airlines operate flights between Seattle and Boston. The airlines offering nonstop flights on this route include:

• Delta
• Alaska Airlines
• JetBlue

Flying via Chicago O'Hare Intl (ORD) gives the shortest average 1-stop total travel time at 8h 19m, compared with 8h 19m via Philadelphia (PHL) and 8h 20m via Denver Intl (DEN).

Boston is 3 hours ahead of Seattle (Eastern Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in Boston are TD Garden, Fenway Park and Boston Common. These are among the most viewed places in Boston on KAYAK.

Among airlines operating Seattle to Boston flights:

• JetBlue: offers extra legroom; offers free seat selection
• Delta: offers extra legroom; offers free seat selection
• Alaska Airlines: offers extra legroom; offers free seat selection
• American Airlines: offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• Delta: a cabin bag and a checked bag in Economy Class
• Alaska Airlines: a cabin bag and a checked bag in Economy Class
• American Airlines: a cabin bag and a checked bag in Business Class

Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.

BOS provides free bus services around the airport. The buses have low floors, which make boarding and luggage loading easier. They also have a wheelchair lift for travelers with disabilities.

Sound Transit’s Link Light Rail connects downtown Seattle with SEA in about 40 minutes. Taxis, rideshares and buses are also available and buses generally cost less.

Boston Logan International Airport operates its own off-site car rental center at 15 Transportation Way. The blue- and white-colored buses depart every 5-6min. Some agencies offer shuttle and pickup services at BOS.

Boston Logan International Airport (BOS) has four terminals. Terminal E is the primary international terminal, although international departures may leave from any of the four terminals and most international arrivals come through Terminal E. Walkways connect all terminals, which makes it possible to walk between them without heavy luggage. Regular shuttles also run between terminals every 5 to 15 minutes.

Yes, SEA and BOS both have pre- and post-security pet-relief areas for cats and dogs. Most flights on this route also allow cats and dogs in the cabin, though requirements such as health certificates and age vary by carrier.

SEA provides facilities and staff support to help travelers move around the airport. Wheelchair services are available at no cost for travelers with disabilities with advance reservation.

Yes, advance notice is generally not required to arrange a wheelchair or other guided assistance before departure on flights from SEA to BOS. At SEA, complimentary wheelchair assistance is available from baggage claim, the parking garage and the Link light-rail station to check-in. After security, wheelchair service is provided by the airline. At BOS, airline personnel are required to provide requested mobility assistance through the terminals. Restrooms at both SEA and BOS are accessible.