We noticed that you're using an unsupported browser. The TripAdvisor website may not display properly.We support the following browsers:
Windows: Internet Explorer, Mozilla Firefox, Google Chrome. Mac: Safari.

Find the best flight from Ontario

Find flights

Great deals from Ontario

We’ve searched 100s of deals recently found by travellers.*
Ontario, CA (ONT) Seattle, WA (SEA)
Wed 07/08 - Sun 11/08
Alaska Airlines - Roundtrip, Economy
US$195
Get Price Alerts
Ontario, CA (ONT) San Francisco, CA (SFO)
Fri 30/08 - Mon 02/09
United Airlines - Roundtrip, Economy
US$204
Get Price Alerts
Ontario, CA (ONT) Las Vegas, NV (LAS)
Tue 03/09 - Thu 05/09
American Airlines - Roundtrip, Economy
US$242
Get Price Alerts
Ontario, CA (ONT) Phoenix, AZ (PHX)
Tue 20/08 - Thu 22/08
American Airlines - Roundtrip, Economy
US$250
Get Price Alerts
Ontario, CA (ONT) Denver, CO (DEN)
Fri 02/08 - Sun 04/08
Frontier Airlines - Roundtrip, Economy
US$254
Get Price Alerts
Ontario, CA (ONT) San Jose, CA (SJC)
Sat 24/08 - Sun 25/08
American Airlines - Roundtrip, Economy
US$299
Get Price Alerts
Ontario, CA (ONT) San Antonio, TX (SAT)
Thu 12/09 - Tue 17/09
American Airlines - Roundtrip, Economy
US$300
Get Price Alerts
Ontario, CA (ONT) New York City, NY (NYC)
Sat 17/08 - Sat 24/08
United Airlines - Roundtrip, Economy
US$321
Get Price Alerts
Want more deals?
Yes! Send me great deals to cool places from: Ontario (ONT)
*Prices are based on round trip travel with returns between 1-21 days after departure. These are the best fares found by travellers who searched TripAdvisor and a select group of our fare search partners in the past 72 hours. Ticket prices and seat availability change rapidly and cannot be guaranteed.