$99 Cheap Delta flights Denver (DEN) to Ontario (ONT)

View $99 flight on Tue, Jan 13, 2026Opens in a new window

$99 Cheap Delta flights Denver (DEN) to Ontario (ONT)

Prices were available within the past 7 days and start at $99 for one-way flights and $133 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Jan 13 - Tue, Jan 20
DEN
Denver
ONT
Ontario
$133 Roundtrip, found 5 days ago
$133
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Jan 13 from Denver to Ontario, returning Tue, Jan 20, priced at $133 found 5 days ago
Delta
Tue, Jan 13 - Tue, Jan 20
DEN
Denver
ONT
Ontario
$197 Roundtrip, found 5 days ago
$197
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Jan 13 from Denver to Ontario, returning Tue, Jan 20, priced at $197 found 5 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 $159
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city center8 min
Flights from $159
Flights from Denver (DEN) to Ontario (ONT)
Origin airport
Denver Intl.
Destination airport
Los Angeles - Ontario Intl.
Distance
1306 km
Average flight time
1 hour 21 mins