Cheap flights from Ontario ONT

Ontario CA to Las Vegas or Vice Versa $38 RT Nonstop Airfares on Frontier Airlines (Travel November - December 2022)

Las Vegas to Hamilton Ontario Canada $139 RT Nonstop Airfares on Swoop Airlines (Limited Travel September - November 2022) $130

Ontario CA to Las Vegas or Vice Versa $48 RT Nonstop Airfares on Frontier Airlines (Travel August - October 2022)

Ontario CA to Madrid Spain $516 RT Airfares on American Airlines / Iberia / British Airways Discount Economy (Travel January - February 2023)

Ontario California to San Juan Puerto Rico or Vice Versa $238 RT Airfares on Frontier Airlines (Travel August - November 2022)

Ontario Calfiornia to Reno / Lake Tahoe or Vice Versa $98 RT Nonstop Airfares on Aha! Airlines (Travel September - January 2023)

Ontario CA to Las Vegas or Vice Versa $48 RT Nonstop Airfares on Frontier Airlines (Travel August - September 2022)

Denver to ONT Ontario CA or Vice Versa $108 RT Nonstop Airfares on Frontier Airlines (Scattered Summer Dates 2022)

Ontario, California to Houston, Texas (& vice versa) for only $96 roundtrip

Ontario, California to Denver, Colorado (& vice versa) for only $96 roundtrip

Ontario CA to Denver or Vice Versa $108 RT Nonstop Airfares on Frontier Airlines (Limited Summer Travel June - August 2022)

Ontario CA to Las Vegas or Vice Versa $48 RT Nonstop Airfares on Frontier Airlines (Travel May - June 2022)