Cheapest one-way flights from Ontario to Denver in January from $29

AirHint found the following cheapest one-way flights from Ontario (ONT) to Denver (DEN) in January 2026 (see full year).

One-Way flights

18 Jan Frontier Airlines direct
11 Jan Frontier Airlines direct
15 Jan Frontier Airlines direct
23 Jan Frontier Airlines direct
31 Jan Frontier Airlines direct
25 Jan Frontier Airlines direct
04 Jan Frontier Airlines direct
01 Jan Frontier Airlines direct
28 Jan Southwest Airlines direct
30 Jan Frontier Airlines direct

Also check the deals for return flights from Ontario to Denver in January.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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