$144 Cheap Flights from Boston (BOS) to Seattle (SEA)

You can find cheap one-way flights from $144 and cheap return flights from $237 Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) with Expedia. One-way flights generally range between $153 and $1005, and roundtrip flights usually range from $266 to $1913. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.

September is the cheapest month to fly from Boston (BOS) to Seattle (SEA), with average return fares around $330. This price is about 16% lower than the average throughout the year, as September marks the end of the summer travel rush. Other affordable months to consider are January and February.*Averages based on flights available on Expedia in the last year.

4 airlines operate nonstop service from BOS to SEA:

• Delta operates around 21 direct flights from BOS to SEA every week
• JetBlue Airways operates around 10 direct flights from BOS to SEA every week
• Hawaiian Airlines operates around 19 direct flights from BOS to SEA every week
• Japan Airlines operates around 7 direct flights from BOS to SEA every week

JetBlue Airways is one of the cheapest airlines offering nonstop flights from Boston, MA (BOS) to Seattle, WA (SEA) with round-trip tickets starting from around $243. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.

When flying from Boston, MA (BOS) to Seattle, WA (SEA), the best months to travel are September and January. Average return flight prices are around $330, providing a budget-friendly option while allowing you to experience Seattle's vibrant culture and beautiful scenery.*Prices based on flights available on Expedia in the last year.

Business class seats are offered on the BOS to SEA route with JetBlue Airways.First class cabins are available on:

• United Airlines
• American Airlines
• Delta Air Lines

A direct, return business class ticket from Boston, MA (BOS) to Seattle, WA (SEA) typically costs between $1,777 - $2,495. A non-stop, one-way business class flight is usually around $716 - $1,181. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.

It's easy to earn miles on a Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.