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Cheapest flights for Ontario – Seattle (ONT – SEA)

Aviasales.ge will find you the cheapest airfare for Ontario – Seattle by comparing the ticket prices to Seattle using 45 agencies, five booking systems, and 728 airlines. Where exactly you buy your tickets for Ontario – Seattle is up to you.

Direct flight for from Ontario to Seattle

The easiest way to to get to your destination is a direct flight. Direct flights for from Ontario to Seattle are offered by:

  • Delta Air Lines (daily DL4031)
  • Hawaiian Airlines (daily HA6289)
  • Alaska Airlines (3 days per week, flight AS1111)
  • Southwest Airlines (3 days per week, flight WN3765)
  • Frontier Airlines (2 days per week, flight F93164)

Seattle is served by 2 airports: Boeing Field International Airport and Seattle-Tacoma International Airport. Direct flights for Ontario – Seattle are operated by:
  • United Airlines, Frontier Airlines, Southwest Airlines, Alaska Airlines from Ontario International Airport to Seattle-Tacoma International Airport
Flight with layover for the route from Ontario to Seattle

A flight with a layover on the route Ontario – Seattle will allow you to make your trip more interesting. The layover could be in:

  • San Jose (flight WN1698 Southwest Airlines)
  • Las Vegas (flight WN3245 Southwest Airlines)
  • Phoenix (flight AA1194 American Airlines)

This is a great chance to get to know these cities. Layovers are usually at least six hours.

Please keep in mind that depending on the number of days remaining until your departure, ticket prices for Ontario – Seattle could change by more than 62%.

Aviasales.ge suggests buying tickets for Ontario – Seattle in advance in order to choose the conditions for your flight that best suit your preferences and budget.

General information on flight Ontario – Seattle (ONT – SEA)
1,557 km
Distance
92
Number of flights per week
₾116
Lowest price
Average ticket price
05:45
Earliest flight out
19:24
Latest flight out

Ticket prices for Ontario – Seattle by month *

Month One-way Round-trip
May 2025 01.05.2025
23.05 - 26.05.2025

* Prices found by users over the last 48 hours (they do not represent an offer).

Cheapest flight for from Ontario to Seattle found by our users over the last 48 hours: ticket with SkyWest Airlines with a departure on 23.05.2025 and a price of 673 GEL.
Airlines flying from Ontario to Seattle
Airports serving Ontario – Seattle

Ontario airports serving flights to Seattle:

  • Ontario International Airport (ONT)

Seattle airports accepting flights from Ontario:

  • Seattle-Tacoma International Airport (SEA)