£151 Find Cheap Flights from Boston to Seattle – Compare and Save

The cheapest month for flights from Boston to Seattle is March, where tickets cost £267 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is £397 and £367 respectively.

To get a below average price on the flight from Boston to Seattle, you should book around 4 weeks before departure, which saves you about 44% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

Weekly flights between Boston and Seattle historically see delays in approximately 18% of cases, with the average delay over the past year being 159 minutes.

Typically, flights leaving in the morning tend to face fewer delays, whereas flights in the evening have historically encountered delays more often.

Statistically, Wednesday is the day of the week with the fewest delays on this flight route, while Thursday has typically experienced more delays than other days.

Based on our data, Delta have experienced the fewest delays on this route in the past 12 months, with only about 16% of their flights encountering any delays.

There is only one cabin class option available for the route, which is Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Each day, there are between 6 and 7 direct flights that take off from Boston and land in Seattle, with an average flight time of 6h 24m. The most common departure time is 07:00 and most flights take off in the morning. Each week, there are 43 flights. The most frequent day of departure is Sunday, when 16% of all weekly flights depart. The fewest flights depart on a Monday.