Fare Guide

Estimated lowest fares found within 7 days

Cheapest Airline Frontier Airlines
Cheapest Month June
Cheapest Day of the Week Saturday
Cheapest Airline Frontier Airlines

The cheapest airline(s) flying from Ontario to Seattle is Frontier Airlines.

  • Frontier Airlines Frontier Airlines
  • Hawaiian Airlines Hawaiian Airlines
  • Southwest Airlines Southwest Airlines
  • United Airlines United Airlines
  • Alaska Airlines Alaska Airlines
  • American Airlines American Airlines
  • JetBlue Airways JetBlue Airways
Cheapest Month June

Travel Period: June 2025 - May 2026

The cheapest month(s) to fly from Ontario to Seattle is June.

  • Jun 2025
  • Jul 2025
  • Aug 2025
  • Sep 2025
  • Oct 2025
  • Nov 2025
  • Dec 2025
  • Jan 2026
  • Feb 2026
  • Mar 2026
  • Apr 2026
  • May 2026
Cheapest Day of the Week Saturday

The cheapest day(s) of the week to fly from Ontario to Seattle is Saturday.

  • Sun Sunday
  • Mon Monday
  • Tue Tuesday
  • Wed Wednesday
  • Thu Thursday
  • Fri Friday
  • Sat Saturday
What’s the most popular airline flying from Ontario to Seattle?

The most popular airline flying from Ontario to Seattle is Alaska Airlines. Find the latest flight deals on Wego.

How far is Seattle from Ontario?

The flight distance between Ontario and Seattle is 1556km. Check all available flights on Wego.

All Airports in Ontario

Ontario LA/Ontario International Airport ONT

Popular Airlines Flying From Ontario to Seattle

Alaska Airlines ‏()
Frontier Airlines ‏()

Popular Destinations From Seattle

Popular Destinations From Ontario

Popular Hotels in Seattle

Hotels In Popular Destinations