Our cheapest offers for flights from United States a Ontario

Here you can compare cheap flights from United States to Ontario (ONT) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to Ontario. Prices and availability may change at any time.

Flights from San Francisco (SFO) to Ontario (ONT)

	Outbound	Return	Airlines	Baggage	Price
Best option San Francisco Ontario	Outbound 04/26/25 direct UA0794 01h 26min	Return 05/23/25 direct UA0277 01h 41min	United Airlines	?	$267
San Francisco Ontario	Outbound 04/26/25 direct UA5553 01h 30min	Return 05/23/25 direct UA0277 01h 41min	United Airlines	?	$275
San Francisco Ontario	Outbound 04/26/25 direct UA5740 01h 35min	Return 05/23/25 direct UA0277 01h 41min	United Airlines	?	$278

Flights from Seattle-Tacoma (SEA) to Ontario (ONT)

	Outbound	Return	Airlines	Baggage	Price
Best option Seattle-Tacoma Ontario	Outbound 04/26/25 direct AS1040 02h 32min	Return 05/23/25 direct AS1087 02h 49min	Alaska Airlines	?	$193
Seattle-Tacoma Ontario	Outbound 04/26/25 direct AS1040 02h 32min	Return 05/23/25 direct AS1087 02h 49min	Alaska Airlines		$205
Seattle-Tacoma Ontario	Outbound 04/26/25 direct AS1254 02h 34min	Return 05/23/25 direct AS1087 02h 49min	Alaska Airlines	?	$206

Flights from Baltimore (BWI) to Ontario (ONT)

	Outbound	Return	Airlines	Baggage	Price
Baltimore Ontario	Outbound 04/12/25 1 Stopover (DFW) F94397, F91405 14h 05min	Return 04/27/25 2 Stopovers (DEN, ATL) F91500, F93294, F92634 37h 47min	Frontier Airlines	?	$293 found 3 days ago
Best option Baltimore Ontario	Outbound 04/21/25 1 Stopover (DEN) F92705, F91261 26h 03min	Return 05/19/25 1 Stopover (DEN) F91500, F92706 13h 23min	Frontier Airlines		$302
Baltimore Ontario	Outbound 04/21/25 2 Stopovers (ATL, LAS) F91079, F91115, F91283 48h 50min	Return 05/19/25 2 Stopovers (DEN, ATL) F91500, F93600, F91080 29h 11min	Frontier Airlines	?	$305

Flights from Dallas (DFW) to Ontario (ONT)

	Outbound	Return	Airlines	Price
Dallas Ontario	Outbound 04/21/25 direct F91405 03h 26min	Return 05/19/25 1 Stopover (DEN) F91500, F91324 05h 35min	Frontier Airlines	$97
Best option Dallas Ontario	Outbound 04/12/25 direct F91405 03h 24min	Return 04/27/25 direct F91406 03h 14min	Frontier Airlines	$115 found 3 days ago
Dallas Ontario	Outbound 04/21/25 direct F91405 03h 26min	Return 05/19/25 1 Stopover (DEN) F91500, F91324 05h 35min	Frontier Airlines	$101

Flights from San Jose (SJC) to Ontario (ONT)

	Outbound	Return	Airlines	Baggage	Price
San Jose Ontario	Outbound 04/26/25 1 Stopover (SEA) AS1311, AS1040 12h 32min	Return 05/23/25 1 Stopover (SEA) AS1087, AS1226 14h 17min	Alaska Airlines	?	$360
Best option San Jose Ontario	Outbound 04/26/25 1 Stopover (PHX) AA1059, AA2661 05h 29min	Return 05/23/25 1 Stopover (SEA) AS1087, AS1080 17h 13min	American Airlines	?	$377
San Jose Ontario	Outbound 04/26/25 1 Stopover (DEN) UA1505, UA5219 07h 01min	Return 05/23/25 1 Stopover (DEN) UA1575, UA0535 07h 41min	United Airlines	?	$878

Flights from Sacramento (SMF) to Ontario (ONT)

	Outbound	Return	Airlines	Baggage	Price
Best option Sacramento Ontario	Outbound 04/26/25 1 Stopover (SFO) UA5655, UA5553 06h 03min	Return 05/23/25 1 Stopover (SFO) UA0277, UA5220 03h 25min	United Airlines	?	$278
Sacramento Ontario	Outbound 04/26/25 1 Stopover (SFO) UA5655, UA5553 06h 03min	Return 05/23/25 1 Stopover (SFO) UA0277, UA5220 03h 25min	United Airlines	?	$295
Sacramento Ontario	Outbound 04/26/25 1 Stopover (SFO) UA5655, UA5553 06h 03min	Return 05/23/25 1 Stopover (SFO) UA0277, UA5220 03h 25min	United Airlines	?	$311

Departure country

United States

Destination airport

United States

Ontario-CA

Stops

Direct flight

Departure airport

Airline

United Airlines
Alaska Airlines
American Airlines
Frontier Airlines
Delta Air Lines

Flight type

Return

Outbound departure month

April 2025
June 2025

Return departure month

April 2025
May 2025
July 2025

Our cheapest offers for flights from United States a Ontario

United States

Ontario-CA