Detour Flights

Cheap flights to Ontario CA

We are tracking 173 fares into Ontario CA (ONT) from 26 departure airports.

Cheapest tracked fare $27  ·  about $71 below the typical price for that distance

Cheapest fares we're tracking

FromDepartsStopsPrice
San Francisco (SFO)2026-09-24Direct$27
Denver (DEN)2026-09-15Direct$35
Seattle (SEA)2026-10-09Direct$49
San Francisco (SFO)2026-10-22Direct$49
Denver (DEN)2026-09-28Direct$52
Seattle (SEA)2026-09-14Direct$53
Las Vegas (LAS)2026-09-20Direct$57
Phoenix (PHX)2026-09-08Direct$58
Seattle (SEA)2026-09-13Direct$61
San Francisco (SFO)2026-09-07Direct$61
Las Vegas (LAS)2026-09-13Direct$62
Las Vegas (LAS)2026-10-26Direct$62
Houston Intercontinental (IAH)2026-09-05Direct$72
San Jose (SJC)2026-10-15Direct$72
San Jose (SJC)2026-10-06Direct$74
Phoenix (PHX)2026-09-12Direct$74
Houston Intercontinental (IAH)2026-10-30Direct$79
Dallas-Fort Worth (DFW)2026-09-08Direct$79
Dallas-Fort Worth (DFW)2026-10-07Direct$80
Dallas-Fort Worth (DFW)2026-10-13Direct$80

Popular departure airports

Flights from San FranciscoFlights from DenverFlights from SeattleFlights from Las VegasFlights from PhoenixFlights from Houston IntercontinentalFlights from San JoseFlights from Dallas-Fort WorthFlights from Chicago O'HareFlights from Chicago MidwayFlights from NewarkFlights from New York LaGuardiaFlights from BaltimoreFlights from Washington ReaganFlights from Everett/SeattleFlights from Kansas CityFlights from CharlotteFlights from Dallas Love FieldFlights from AtlantaFlights from Nashville

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

Which airports have cheap flights to Ontario CA?
We are currently tracking 173 fares into Ontario CA from 26 departure airports, 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.