About Ontario International Airport
Ontario International Airport (ONT) serves the Inland Empire in Southern California.
In our search over 29 November to 6 December 2026, Frontier flies direct from San Francisco, Denver and Las Vegas, and one stop is available from Oakland, Dallas and Minneapolis. The fares below are dated.
Taxis, ride-hailing and shuttles connect the airport with the Inland Empire.
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Cheap Flights to Ontario International Airport
Lowest one-way fares to Ontario from popular departure cities
*All above fares are one way/round trip. Fares incl. all fuel surcharges, taxes & fees and our service fees. Displayed fares are subject to change and cannot be guaranteed at the time of booking. See all booking terms and conditions.
Cheapest Routes to Ontario International Airport
Lowest one-way fares we found for 29 November to 6 December 2026 on direct and one-stop itineraries booked on a single ticket. Fares change often, so check your own dates.
| From | Airline | Stops | Duration | Date | Fare from |
|---|---|---|---|---|---|
| San Francisco (SFO) | Frontier | Direct | 1h 23m | 2 Dec | $19 |
| Denver (DEN) | Frontier | Direct | 2h 22m | 5 Dec | $20 |
| Las Vegas (LAS) | Frontier | Direct | 1h 6m | 5 Dec | $21 |
| Oakland (OAK) | Frontier | 1 stop | 5h 43m | 2 Dec | $57 |
| Dallas (DFW) | Frontier | 1 stop | 16h 49m | 5 Dec | $63 |
| Minneapolis (MSP) | Frontier | 1 stop | 10h 7m | 5 Dec | $64 |
Airlines Flying to Ontario International Airport
Carriers that showed up in our search for this airport
Frontier
Frontier flights to Ontario International Airport appeared in our search from 6 cities, with one-way fares starting at $19 for 29 November to 6 December 2026.
Routes: San Francisco (SFO), Denver (DEN), Las Vegas (LAS), Oakland (OAK), Dallas (DFW), Minneapolis (MSP)
Things to Do Near Ontario International Airport
Highlights around Ontario
Big Bear Lake
About 1.5 hours away.
Mount Baldy
Mountain trails.
Rancho Cucamonga
Historic wineries.
Los Angeles
About 1 hour away.
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Frequently Asked Questions
Everything you need to know about flying to Ontario International Airport
Which airport serves Ontario?
Ontario International Airport (ONT) serves Ontario, United States. It is about 6 km east of downtown Ontario, California.
Are there direct flights to Ontario?
Yes. In our search over 29 November to 6 December 2026 we found direct flights from San Francisco (Frontier), Denver (Frontier), Las Vegas (Frontier). Availability varies by date.
What is the cheapest way to fly to Ontario?
The lowest fare we found was US$19 one-way, direct from San Francisco on Frontier, on 2 Dec 2026. Fares change often, so compare dates.
Do I need a visa to visit United States?
Citizens of many countries can enter the United States visa-free through the Visa Waiver Program with an approved ESTA; others need a visa. Check the rules for your passport before you travel.
What currency is used in Ontario?
The United States uses the US dollar (USD).
