$167 Cheap Flights from Boston (BOS) to Seattle (SEA)

Boston (BOS) to Seattle (SEA) at a glance

Explore a range of options for flights from Boston (BOS) to Seattle (SEA) on this domestic long-haul route. Whether you prefer full-service airlines or budget-friendly carriers, you can compare choices to find the itinerary that suits your budget and schedule. Discover the vibrant sights and neighborhoods of Seattle as you plan your journey, and find essential details for your trip from Logan International Airport to Seattle-Tacoma International Airport.

• Fastest flight duration: around 6h 30m non-stop
• Route distance: roughly 2,500 miles (4,020 km)
• Flights per week: around 55+ flights with multiple daily departures on average
• Typical fares (one-way): economy tickets often range from $100–$420, depending on seasonality and how far ahead you book

Flights from Logan International Airport (BOS) to Seattle - Tacoma International Airport (SEA)

According to recent traveler bookings, here are the top airlines favored for flights from Boston to Seattle, featuring both non-stop and one-stop options. Many travelers opt for layovers at O'Hare International Airport (ORD) with an average layover of about 1 hour and 30 minutes, Denver International Airport (DEN) at approximately 1 hour and 15 minutes, and Philadelphia International Airport (PHL), also around 1 hour and 15 minutes. This variety allows you to tailor your journey based on price, total travel time, and cabin class for the ideal itinerary.

• Alaska Airlines: This full-service airline provides both non-stop and one-stop options, with one-way fares generally between $110 and $500. It represents around 34% of the departures on this route, and a direct flight typically lasts about 6 hours and 30 minutes.
• Delta: Another full-service option, Delta also offers non-stop and one-stop flights, with one-way prices ranging from $100 to $490. It accounts for approximately 32% of departures on this route, with a standard non-stop travel time of 6 hours and 30 minutes.
• JetBlue Airways: As a low-cost carrier, JetBlue provides non-stop and one-stop services, with fares usually falling between $100 and $340. This airline makes up about 10% of the departures for this route, with a typical non-stop flight taking around 6 hours and 30 minutes.
• American Airlines: Offering full-service options, American Airlines provides non-stop and one-stop services, with one-way fares ranging from $105 to $565. It accounts for roughly 10% of departures on this route, with a one-stop journey averaging 7 hours and 45 minutes in the air and a total travel time of about 9 hours.
• United: This full-service airline offers both non-stop and one-stop service, with one-way fares typically ranging from $125 to $430. United represents around 8% of departures on this route, featuring a standard one-stop flight of 7 hours and 45 minutes and a total journey time of approximately 9 hours.

Travelers flying from Boston to Seattle can enhance their experience by upgrading to premium cabins. Delta features first class and premium economy service, while Alaska Airlines provides first class and business class options. American Airlines also offers first class and business class for a more luxurious journey.

Best time to fly from Boston (BOS) to Seattle (SEA)

The most popular months for travelers flying from Boston to Seattle are April, July, and August, when peak temperatures in Seattle reach up to 67.5°F in August. If you prefer quieter travel, consider February, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 40.5°F. For better deals, March usually offers the lowest average one-way fare around $199. Flight availability peaks in August, with approximately 82 flights per week, making it easier to find convenient departure times.

• Cheapest time to fly: March usually offers good deals with average one-way fare around $199, roughly 17% cheaper than the yearly average.
• More budget-friendly months to fly: September, January, and October typically offer average one-way fares roughly ranging from $205 to $218.
• Most flight options: August has the highest number of flights from Boston to Seattle, with approximately 82 flights per week, giving you more flexibility in scheduling your trip.

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from Boston (BOS) to Seattle (SEA)

• Boston to Renton (BOS-RNT): Renton Municipal Airport (RNT) lies approximately 5 miles from Seattle - Tacoma International Airport (SEA), providing convenient access to the Seattle area.
• Boston to Seattle (BOS-BFI): Boeing Field Airport (BFI) is located around 6 miles from Seattle - Tacoma International Airport (SEA), making it a close option for travelers heading into Seattle.
• Boston to Seattle (BOS-LKE): Lake Union Seaplane Base Airport (LKE) is situated about 13 miles from Seattle - Tacoma International Airport (SEA), offering unique travel experiences over the water.

How to find the best prices for flights from Boston (BOS) to Seattle (SEA)

Getting some of the best deals on flights from Boston to Seattle is all about timing and flexibility. Here are some key tips to help you save:

1. Best times to book and fly: cheaper fares are usually found when booking 2 to 8 weeks in advance, which is also when most travelers make their reservations. Morning departures between 5 a.m. and 12 p.m. tend to be the least expensive and are the most popular flight times, while flying on Friday offers both lower prices and high demand among travelers.
2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Seattle - Tacoma International Airport from Logan International Airport

Seattle welcomes travelers from Boston with a range of transport options based on price, convenience, and proximity. Seattle city center is approximately a 20-minute drive (covering about 14 miles) from Seattle - Tacoma International Airport, depending on traffic. Here's how to reach Seattle efficiently:

• Hotel transfer: Transfers offer a convenient way to reach your hotel in Seattle, with private rides that can be arranged in advance.
• Car rental: Renting a car from Seattle - Tacoma International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Seattle - Tacoma International Airport on Expedia.
• Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
• Public transportation: From Seattle - Tacoma International Airport, SeaTac/Airport Station, a metro station, is conveniently located just 0.3 miles away on foot, while Tukwila Station, a train station, is situated approximately 4.3 miles from the airport and typically reached by car.

Boston to Seattle Flights

The cheapest times to fly from Boston to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Boston to Seattle are during the month of October. You can find some of the cheapest flights from Boston to Seattle with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Boston to Seattle

Sunday is one of the best days to book for cheap flights from Boston to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Boston to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Boston to Seattle in 2026. You can also book with separate airlines for your outbound and return journeys, from $167 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Boston to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Boston to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.