FareCare & Support Included
FareCare & Support funds our human support team and proactive flight monitoring—clearly shown in your fare breakdown.
Proactive Disruption Support
We monitor your flights for disruptions and present rebooking options, subject to airline availability.
Tips for Finding Cheap Flights
Flying mid-week (Tuesday-Thursday) often offers lower fares than weekend travel.
For domestic flights, booking 1-3 months ahead typically yields the best prices.
Consider APA, BJC for potentially lower fares.
Our all-in pricing includes taxes and fees, so you can compare true costs.
Best Time to Book
Consider traveling during shoulder seasons (spring/fall) for the best balance of prices and weather.
Check Nearby Airports
Flying from a nearby airport could save you money
Consider these alternatives for potentially lower fares
Frequently Asked Questions
Direct flights from Denver (DEN) to Ontario (ONT) take approximately 2h 8m to 3h 8m. Connecting flights may take longer depending on layover duration.
Airlines operating flights between Denver and Ontario include United Airlines, Frontier Airlines, American Airlines, Delta Air Lines. Availability varies by season and day of week.
Consider traveling during shoulder seasons (spring/fall) for the best balance of prices and weather. For domestic US flights, booking 1-3 months in advance typically yields the best prices.
Yes, nonstop flights are available from Denver International Airport (DEN) to Ontario International Airport (ONT). Flight time is approximately 2h 8m.
FareCare & Support is included with every AIFareFinder booking. It provides real-time fare verification before payment, secure checkout, and priority assistance if your flight is disrupted. We proactively monitor your booking and alert you with rebooking options if anything changes.