Fare Guide

Estimated lowest fares found within 7 days

Cheapest Airline Frontier Airlines

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

  • Frontier Airlines Frontier Airlines
  • United Airlines United Airlines
  • American Airlines American Airlines
  • Southwest Airlines Southwest Airlines
  • Alaska Airlines Alaska Airlines
  • Hahn Air Lines Hahn Air Lines
Cheapest Month January

Travel Period: December 2024 - November 2025

The cheapest month(s) to fly from Washington to Ontario is January.

  • Dec 2024
  • Jan 2025
  • Feb 2025
  • Mar 2025
  • Apr 2025
  • May 2025
  • Jun 2025
  • Jul 2025
  • Aug 2025
  • Sep 2025
  • Oct 2025
  • Nov 2025
Cheapest Day of the Week Thursday

The cheapest day(s) of the week to fly from Washington to Ontario is Thursday.

  • Sun Sunday
  • Mon Monday
  • Tue Tuesday
  • Wed Wednesday
  • Thu Thursday
  • Fri Friday
  • Sat Saturday
How far is Ontario from Washington?

The flight distance between Washington and Ontario is 3640km. Check all available flights on Wego.