Find Delta Air Lines(DL) flights from Montreal to Seattle

By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Montreal to Seattle is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

The cheapest months to fly from Montreal to Seattle is October, when demand for travel is lower.

After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Montreal to Seattle on December 11, 2025 with United Airlines, with prices starting at €246.

The time difference between Seattle and Montreal is 3h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.