Flights from Ontario (ONT) starting at $ 155*
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1 Passenger, Economy
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today
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Fly from Ontario and get United's best fares
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Ontario (ONT)to
San Francisco (SFO)05/13/26 - 05/20/26from$ 155Viewed: 11 hours agoRoundtripEconomy
Ontario (ONT)to
Denver (DEN)05/26/26 - 05/30/26from$ 197Viewed: 11 hours agoRoundtripEconomy
Ontario (ONT)to
Chicago (ORD)05/19/26 - 05/19/26from$ 329Viewed: 10 hours agoRoundtripEconomy
Ontario (ONT)to
Houston (IAH)04/29/26 - 05/02/26from$ 215Viewed: 11 hours agoRoundtripEconomy
Ontario (ONT)to
Newark/New York (EWR)04/21/26 - 04/28/26from$ 384Viewed: 11 hours agoRoundtripEconomy
Ontario (ONT)to
Orlando (MCO)05/20/26 - 06/03/26from$ 305Viewed: 22 hours agoRoundtripEconomy
Ontario (ONT)to
Miami (MIA)05/05/26 - 05/12/26from$ 245Viewed: 11 hours agoRoundtripEconomy
Ontario (ONT)to
Seattle (SEA)04/15/26 - 04/18/26from$ 217Viewed: 11 hours agoRoundtripEconomy
Ontario (ONT)to
Boston (BOS)05/20/26 - 06/02/26from$ 243Viewed: 18 hours agoRoundtripEconomy
Ontario (ONT)to
Nashville (BNA)08/19/26 - 08/31/26from$ 237Viewed: 11 hours agoRoundtripEconomyOntario (ONT)to
Newark/New York (LGA)04/28/26 - 05/02/26from$ 257Viewed: 19 hours agoRoundtripEconomy
Ontario (ONT)to
Las Vegas (LAS)04/22/26 - 04/29/26from$ 183Viewed: 10 hours agoRoundtripEconomy
Ontario (ONT)to
Toronto (YYZ)04/16/26 - 04/19/26from$ 450Viewed: 1 day agoRoundtripEconomy
Ontario (ONT)to
Honolulu (HNL)04/16/26 - 04/19/26from$ 386Viewed: 19 hours agoRoundtripEconomy
Ontario (ONT)to
Atlanta (ATL)06/02/26 - 06/06/26from$ 421Viewed: 11 hours agoRoundtripEconomy
Ontario (ONT)to
Baltimore (BWI)05/05/26 - 05/07/26from$ 344Viewed: 1 day agoRoundtripEconomy
Ontario (ONT)to
Agana, Guam (GUM)05/28/26 - 06/04/26from$ 1,919Viewed: 22 hours agoRoundtripEconomy
Ontario (ONT)to
London (LHR)04/14/26 - 04/21/26from$ 905Viewed: 4 hours agoRoundtripEconomy
Ontario (ONT)to
San Salvador (SAL)05/10/26 - 05/24/26from$ 325Viewed: 19 hours agoRoundtripEconomy
Ontario (ONT)to
Detroit (DTW)04/21/26 - 04/28/26from$ 341Viewed: 11 hours agoRoundtripEconomy
*Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply. Schedules are subject to change without notice.
United popular flights from Ontario (ONT)
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From | To | Fare Type | Dates | Price |
|---|---|---|---|---|
| Ontario (ONT) | San Francisco (SFO) | Roundtrip | Economy | 05/27/26 - 06/03/26 | from $ 155 Viewed: 11 hours ago |
| Ontario (ONT) | Denver (DEN) | Roundtrip | Economy | 06/06/26 - 06/10/26 | from $ 197 Viewed: 11 hours ago |
| Ontario (ONT) | Chicago (ORD) | Roundtrip | Economy | 05/19/26 - 05/19/26 | from $ 329 Viewed: 10 hours ago |
| Ontario (ONT) | Houston (IAH) | Roundtrip | Economy | 04/28/26 - 05/02/26 | from $ 215 Viewed: 11 hours ago |
| Ontario (ONT) | Newark/New York (EWR) | Roundtrip | Economy | 04/21/26 - 04/25/26 | from $ 384 Viewed: 11 hours ago |
| Ontario (ONT) | Orlando (MCO) | Roundtrip | Economy | 05/20/26 - 06/03/26 | from $ 305 Viewed: 22 hours ago |
| Ontario (ONT) | Miami (MIA) | Roundtrip | Economy | 04/21/26 - 04/28/26 | from $ 245 Viewed: 11 hours ago |
| Ontario (ONT) | Seattle (SEA) | Roundtrip | Economy | 04/25/26 - 04/29/26 | from $ 217 Viewed: 11 hours ago |
*Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply. Schedules are subject to change without notice.