What’s the cost of a flight from Ontario to Seattle?

Prices vary based on date, airline, and availability. Compare several options if you're flying between Ontario and Seattle.

Choose a date to explore the best fares now.

If possible, avoid holiday periods: ticket prices tend to rise quickly and availability drops, especially on busy routes. Morning and evening flights are often in high demand too — book early to get a good fare.

Flying between Ontario and Seattle? Consider these airports

Depending on your destination and where you’re starting from, it might make sense to look beyond the main hubs.

• Airports in Ontario: Ontario has only one airport in service, Ontario.
• Airports in Seattle: Seattle has 2 airports - Boeing Field, Lake Union.

Check if your destination airport has a rail link — it can make getting around easier. Jetcost lets you view options from all Ontario airports in a single search.

Refine your flight search from Ontario to Seattle

With Jetcost, it’s easy to narrow down results to find flights that match your schedule and preferences. You can filter by airline, price, trip type, and more — including offers from the best airlines and travel agencies.

Other popular destinations

Also looking at United States? These cities are trending: Las Vegas, Los Angeles, Miami, New York City, Orlando.

Online agencies can show different offers for the same flight — it’s worth comparing. Filters let you narrow things down further, like selecting a specific time slot to find flights that suit you best.