Detour Flights

Cheap flights from Ontario CA

We are tracking 211 fares out of Ontario CA (ONT) to 47 destinations.

Cheapest tracked fare $28  ·  about $70 below the typical price for that distance

Cheapest fares we're tracking

ToDepartsStopsPrice
San Francisco (SFO)2026-09-17Direct$28
San Francisco (SFO)2026-09-21Direct$28
San Francisco (SFO)2026-09-24Direct$28
San Francisco (SFO)2026-09-28Direct$28
San Francisco (SFO)2026-10-22Direct$28
Denver (DEN)2026-09-06Direct$31
Denver (DEN)2026-09-14Direct$31
San Francisco (SFO)2026-10-19Direct$31
Denver (DEN)2026-09-11Direct$35
Seattle (SEA)2026-09-08Direct$46
San Francisco (SFO)2026-10-12Direct$46
San Francisco (SFO)2026-10-30Direct$46
Seattle (SEA)2026-09-25Direct$47
Phoenix (PHX)2026-12-01Direct$52
Seattle (SEA)2026-10-05Direct$53
Phoenix (PHX)2026-10-31Direct$57
Seattle (SEA)2026-09-26Direct$58
Seattle (SEA)2026-10-03Direct$58
Las Vegas (LAS)2026-10-26Direct$58
San Francisco (SFO)2026-09-151 stop$59

Popular destinations

Flights to San FranciscoFlights to DenverFlights to SeattleFlights to PhoenixFlights to Las VegasFlights to Houston IntercontinentalFlights to Salt Lake CityFlights to Dallas-Fort WorthFlights to MinneapolisFlights to Chicago O'HareFlights to New York LaGuardiaFlights to NewarkFlights to Washington ReaganFlights to Houston HobbyFlights to MiamiFlights to OrlandoFlights to AustinFlights to NashvilleFlights to New York JFKFlights to Guadalajara

Compare every airport, not just this one

Pin one end of your trip and let a whole region compete for the other. The cheapest airport is often not the one you were going to use.

Find my cheapest airport

Common questions

Where can I fly cheaply from Ontario CA?
We are currently tracking 211 fares out of Ontario CA across 47 destinations, listed cheapest first above.
Is Ontario CA the cheapest airport for this trip?
Not always. Cached fare feeds cover big hubs densely and secondary airports sparsely, so a cheaper nearby airport is often simply missing from a normal search rather than more expensive. Our reverse search prices a whole region's airports against each other to surface it.