Select journey type

Enter to select travel class and passengers

Ultra Low Fare Flights from Boston (BOS) to Seattle (SEA) with Spirit

Fly Boston to Seattle and Save Big

*Fares presented below are available at the beginning of each day, but may sell out. Additional baggage fees and fees for other services may apply. Other terms and conditions may apply.

  1. BOS-SEA

    Boston to Seattle

    Departing 04/09/2019

    Fares From
    $110*

    One Way

Ultra Low Fare Flights from Boston (BOS) to Seattle (SEA) with Spirit

Boston to Seattle Flight Deals

*Fares presented below are available at the beginning of each day, but may sell out. Additional baggage fees and fees for other services may apply. Other terms and conditions may apply.

  1. Boston (BOS) to Seattle (SEA)

    One Way

    Departing 09/19/2019

    Fares From
    $213*

Weather in Seattle

Wednesday ,scattered clouds
5°C 02/20/2019
Thursday ,sky is clear
6°C 02/21/2019
Friday ,light snow
3°C 02/22/2019
Saturday ,light rain
3°C 02/23/2019
Sunday ,moderate rain
1°C 02/24/2019
Monday ,sky is clear
2°C 02/25/2019
Tuesday ,light rain
3°C 02/26/2019
Powered by: OpenWeatherMap.org