$84 Cheap Frontier Airlines flights Ontario (ONT) to Denver (DEN)

View $84 flight on Wed, Jul 16, 2025Opens in a new window

$84 Cheap Frontier Airlines flights Ontario (ONT) to Denver (DEN)

Prices were available within the past 7 days and start at $84 for one-way flights and $149 for roundtrip, for the period specified. Prices and availability are subject to change. Additional terms apply.
Frontier Airlines
Sat, Jul 19 - Sat, Jul 26
ONT
Ontario
DEN
Denver
$149
Roundtrip
Found 6 days ago
Select Frontier Airlines flight, departing Sat, Jul 19 from Ontario to Denver, returning Sat, Jul 26, priced at $149 Found 6 days ago
Frontier Airlines
Sat, Jul 12 - Sat, Jul 12
ONT
Ontario
DEN
Denver
$163
Roundtrip
Found 1 day ago
Select Frontier Airlines flight, departing Sat, Jul 12 from Ontario to Denver, returning Sat, Jul 12, priced at $163 Found 1 day ago
Frontier Airlines
Sat, Jul 19 - Sat, Jul 26
ONT
Ontario
DEN
Denver
$166
Roundtrip
Found 6 days ago
Select Frontier Airlines flight, departing Sat, Jul 19 from Ontario to Denver, returning Sat, Jul 26, priced at $166 Found 6 days ago
Frontier Airlines
Tue, Jul 8 - Sat, Jul 12
ONT
Ontario
DEN
Denver
$168
Roundtrip
Found 1 day ago
Select Frontier Airlines flight, departing Tue, Jul 8 from Ontario to Denver, returning Sat, Jul 12, priced at $168 Found 1 day ago
Frontier Airlines
Wed, Jul 16 - Sun, Jul 27
ONT
Ontario
DEN
Denver
$176
Roundtrip
Found 1 day ago
Select Frontier Airlines flight, departing Wed, Jul 16 from Ontario to Denver, returning Sun, Jul 27, priced at $176 Found 1 day ago
Frontier Airlines
Sat, Jun 21 - Wed, Jun 25
ONT
Ontario
DEN
Denver
$188
Roundtrip
Found 3 days ago
Select Frontier Airlines flight, departing Sat, Jun 21 from Ontario to Denver, returning Wed, Jun 25, priced at $188 Found 3 days ago
Flights from Ontario (ONT) to Denver (DEN)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, United
Popular airline
Frontier Airlines
Distance
1306 km
Average flight time
3 hours 14 mins