Cheap Flights from Seattle (SEA) to St. Catharines (YCM)

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Frequently asked questions

Is it cheaper to buy a plane ticket from Sea-Tac Airport to YCM last minute?
When it comes to booking your flights, it pays to be prepared. While you may be able to score a deal on a Sea-Tac Airport to YCM flight at the last minute, tickets usually don't get cheaper as the departure date nears. Based on flight pricing and demand studies in 2022, we have found that the sweet spot to lock in a domestic flight is between 28 – 35 days in advance. For international travel it's between three and four months.
What airports do you fly into for Niagara-on-the-Lake from Seattle?
St. Catharines, ON (YCM-Niagara District) is the main terminal where Seattle to Niagara-on-the-Lake flights come in to land. It's located around 11 kilometers southwest of the center of Niagara-on-the-Lake. You'll land spectacular deals on flights, car rentals, hotels and more when arranging your Niagara-on-the-Lake break with Expedia.
Can I change the date of my flight from SEA to YCM?
Plans can get upended, so Expedia is here to help make things easy. To start, access your Sea-Tac Airport to YCM itinerary through the Expedia Trips portal and read the ticket rules about what changes are allowed. If you purchased your airfare in the last 24 hours, some carriers will let you cancel at no cost and organize new flights. If you bought your ticket more than 24 hours ago, contact us via our Customer Service portal to find out your options.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Niagara District
Distance
3341 km

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