£131 Find Cheap Flights from Boston to Seattle – Compare and Save

Among airlines operating Boston to Seattle flights:

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

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

• Delta
• Alaska Airlines
• JetBlue

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

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

• Alaska Airlines: a cabin bag and a checked bag in Economy class
• Delta: a cabin bag and a checked bag in Economy class
• JetBlue: a cabin bag in Economy class class

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

Only Economy class is available on flights from Boston to Seattle.

On this route, stopover flights are cheaper than direct options on average. Stopover fares average £208 return via New York John F Kennedy Intl (JFK), compared with £325 for direct.

There is no standard. Checked bag policies vary by airline on this route. Most carriers charge £26–£74 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.

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

• Philadelphia (PHL) – 31% of one-stop connections
• Chicago O'Hare Intl (ORD) – 28% of one-stop connections
• Minneapolis St Paul (MSP) – 13% of one-stop connections
• Denver Intl (DEN) – 7% of one-stop connections

Philadelphia (PHL) handles the largest share of one-stop connections on this route.

Yes. Being flexible with your travel dates can save you up to 16% on the Boston to Seattle route. Wednesday is the cheapest departure day at £307 return on average, while Monday is the most expensive at £365, a difference of £58. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

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 Boston to Seattle route, 17% of flights were delayed in the past 3 months, with delays averaging 2 hours 53 minutes.

Morning is the busiest departure period on Boston to Seattle flights, with 58% leaving in that window. Evening departures account for 28%, Afternoon flights for 14%, and Night flights for 0%.

Some of the most popular sights in Seattle are Pier 66, The Westin Seattle, and Seattle Center. These are among the most viewed places in Seattle on KAYAK.

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

• Earliest: departs at 07:00 and lands at 13:21
• Latest: departs at 19:59 and lands at 02:20.

The flight takes about 6h 21m.

Last-minute fares on this route (booked within 2 weeks of departure) run 38% above the route average of £324. Book 14 weeks before departure for the lowest fares.

A direct flight from Boston to Seattle takes 6h 21m, 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.

Yes. Based on fares seen in the past 5 days, return flight prices on this route showed a wide range, from about £236 to £1,232. That means the highest observed fare was about 5x higher than the lowest one.

One-way fares from Boston to Seattle are currently lower than usual. Average one-way flight prices are about £142, which is 27% below the typical average for this route.

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

• Delta: 84% on time
• JetBlue: 83% on time
• Alaska Airlines: 82% on time

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

Morning flights have the fewest delays on this route. Delays tend to pile up throughout the day as one late flight pushes the next, so earlier departures are usually more reliable.

Flying via Chicago O'Hare Intl (ORD) gives the shortest average 1-stop total travel time of 8h 19m, compared to 8h 25m via Philadelphia (PHL) and 8h 25m via Chicago Midway (MDW).

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

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car hire companies, with daily rates starting from around £3 for economy cars. Top options include:
• Fox
• Europcar
• Thrifty
• Budget
• Dollar

Return flights from Boston to Seattle range from £259 to £407, with an average of £324 over the past 12 months. Anything below £259 counts as a good deal.

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

• • JetBlue
• • Alaska Airlines
• • Delta