Beginning of main content
Trip Type
Flight 1
Flight 2
Flight 3
Flight 4
Flight 5
Due to coronavirus (COVID-19) travel advisories, some destinations may be unavailable for certain dates. Find out more.

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Amazing United SEA to BOS Flight Deals

The cheapest flights to Logan Intl. found within the past 7 days were round trip and $106 one way. Prices and availability subject to change. Additional terms may apply.

FAQs about United Airlines Flights from SEA to BOS

What terminal is United Airlines at Sea-Tac Airport?

Check your boarding pass to find out which Seattle, WA Airport (SEA-Seattle - Tacoma Intl.) terminal you'll be departing from on your way to Boston, MA Airport (BOS-Logan Intl.) with United Airlines. If you can't spot the details on there, get in touch with your airline.

Are there United Airlines non-stop flights from SEA to BOS?

If you're traveling with United Airlines from Seattle, WA Airport (SEA-Seattle - Tacoma Intl.) to Boston, MA Airport (BOS-Logan Intl.), you'll have to make at least one stop. While you're waiting for your connection, take the opportunity to grab a bite to eat or go for a wander.

How long is an United Airlines flight from SEA to BOS?

As it'll take an average of 8 hours and 36 minutes for your United Airlines flight to jet from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Boston, MA (BOS-Logan Intl.), consider sticking some entertaining travel games in your carry-on bag. You never know — the passenger next to you might welcome a challenge to break up the journey.

How many direct and indirect flights does United Airlines fly from SEA to BOS?

If you're planning a trip from SEA to BOS, you can select from around 5 United Airlines flights each day.

Flying Tips & Tricks How do I find my flight number?
  • The number can be found in your travel itinerary, which will be emailed to you upon confirmation of your booking. If you're unsure what to look out for, browse the document for a code consisting of letters and numbers. The first couple of letters and single digit are the IATA airline code, which indicates the name of your airline. This is followed by one, two, three or four digits — your flight number.
How early can you check bags for a flight?
  • If you're eager to arrive at the airport well ahead of time, you'll be thrilled to hear that you can check your luggage in three hours before an international flight and two hours prior to a domestic one. Not sure what the check-in closing times are? For international flights, it's one hour prior to departure. For domestic flights, it's usually 45 minutes.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.