$114 Cheap United flights Denver (DEN) to Ontario (ONT)

View $114 flight on Tue, Jan 13, 2026Opens in a new window

$114 Cheap United flights Denver (DEN) to Ontario (ONT)

Prices were available within the past 7 days and start at $114 for one-way flights and $157 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Jan 13 - Tue, Jan 20
DEN
Denver
ONT
Ontario
$157 Roundtrip, found 2 days ago
$157
Roundtrip
found 2 days ago
Select United flight, departing Tue, Jan 13 from Denver to Ontario, returning Tue, Jan 20, priced at $157 found 2 days ago

Find the cheapest month to fly from Denver (DEN) to Ontario (ONT)

February is typically the cheapest month to fly

From $48 - $102 per traveler.

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Los Angeles - Ontario Intl. ONT. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $93
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city center8 min
Flights from $93
Flights from Denver (DEN) to Ontario (ONT)
Origin airport
Denver Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Popular airline
American Airlines
Distance
1306 km
Average flight time
1 hour 21 mins