Cheap flight from Denver to Ontario from $19
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Flights from Denver to Ontario
Cheap flight deals from Denver to Ontario
We've found these cheap flights for you. You can book one-way or round-trip flight tickets.
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Round-trip
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One way
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Cheapest nonstop
DEN 10:00 AM2h 26mNonstopONT 11:26 AMDenver - Ontario | Tue, May 6 | Frontier Airlines
SIN 6:15 AM2h 33mNonstopDEN 9:48 AMOntario - Denver | Sat, May 10 | Frontier Airlines$46 $36988% OFF88% OFF$369 $46 -
DEN 10:38 PM2h 21mNonstopONT 11:59 PMDenver - Ontario | Sat, May 10 | Frontier Airlines
SIN 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Sat, May 17 | Frontier Airlines$158 $36956% OFF56% OFF$369 $158
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DEN 10:37 PM2h 22mNonstopONT 11:59 PMDenver - Ontario | Tue, May 13 | Frontier Airlines
SIN 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Sat, May 17 | Frontier Airlines$158 $36956% OFF56% OFF$369 $158
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DEN 9:43 PM2h 25mNonstopONT 11:08 PMDenver - Ontario | Wed, May 14 | Frontier Airlines
SIN 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Mon, May 19 | Frontier Airlines$16456% OFF$369 $164
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DEN 10:37 PM2h 22mNonstopONT 11:59 PMDenver - Ontario | Fri, May 16 | Frontier Airlines
SIN 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Sun, May 18 | Frontier Airlines$16655% OFF$369 $166
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DEN 10:37 PM2h 22mNonstopONT 11:59 PMDenver - Ontario | Thu, May 15 | Frontier Airlines
SIN 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Mon, May 19 | Frontier Airlines$19547% OFF$369 $195
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DEN 10:37 PM2h 22mNonstopONT 11:59 PMDenver - Ontario | Fri, May 9 | Frontier Airlines
SIN 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Sun, May 11 | Frontier Airlines$26030% OFF$369 $260
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DEN 9:50 AM2h 25mNonstopONT 11:15 AMDenver - Ontario | Thu, May 8 | Frontier Airlines
SIN 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Mon, May 12 | Frontier Airlines$26428% OFF$369 $264
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DEN 10:00 AM2h 26mNonstopONT 11:26 AMDenver - Ontario | Mon, May 5 | Frontier Airlines
SIN 12:08 AM2h 18mNonstopDEN 3:26 AMOntario - Denver | Thu, May 8 | Frontier Airlines$28523% OFF$369 $285
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DEN 10:37 PM2h 22mNonstopONT 11:59 PMDenver - Ontario | Sat, May 3 | Frontier Airlines
SIN 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Tue, May 6 | Frontier Airlines$30717% OFF$369 $307
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DEN 1:00 PM17h 25m1 stopsONT Invalid DateDenver - Ontario | Mon, May 5 | Normal Airline
ONT 3:00 PM6hNonstopDEN 4:00 PMOntario - Denver | Wed, May 7 | Normal AirlineFind More FlightsFind More Flights
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Cheapest nonstop
DEN 10:29 PM2h 21mNonstopONT 11:50 PMDenver - Ontario | Tue, Jun 10 | Frontier Airlines$19 $18490% OFF90% OFF$184 $19
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DEN 10:00 AM2h 26mNonstopONT 11:26 AMDenver - Ontario | Tue, May 13 | Frontier Airlines$19 $18489% OFF89% OFF$184 $19
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DEN 10:00 AM2h 26mNonstopONT 11:26 AMDenver - Ontario | Sat, May 3 | Frontier Airlines$25 $18486% OFF86% OFF$184 $25
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DEN 10:29 PM2h 22mNonstopONT 11:51 PMDenver - Ontario | Sat, May 24 | Frontier Airlines$2984% OFF$184 $29
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DEN 10:00 AM2h 26mNonstopONT 11:26 AMDenver - Ontario | Mon, May 5 | Frontier Airlines$3083% OFF$184 $30
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DEN 10:29 PM2h 21mNonstopONT 11:50 PMDenver - Ontario | Tue, Jun 3 | Frontier Airlines$3183% OFF$184 $31
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DEN 9:50 AM2h 25mNonstopONT 11:15 AMDenver - Ontario | Mon, May 12 | Frontier Airlines$13128% OFF$184 $131
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DEN 10:37 PM2h 22mNonstopONT 11:59 PMDenver - Ontario | Fri, May 9 | Frontier Airlines$13128% OFF$184 $131
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DEN 10:37 PM2h 22mNonstopONT 11:59 PMDenver - Ontario | Tue, May 6 | Frontier Airlines$15217% OFF$184 $152
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DEN 10:37 PM2h 22mNonstopONT 11:59 PMDenver - Ontario | Wed, May 7 | Frontier Airlines$15317% OFF$184 $153
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DEN 1:00 PM17h 25m1 stopsONT Invalid DateDenver - Ontario | Mon, May 5 | Normal AirlineFind More FlightsFind More Flights
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Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
Flight Info | Denver to Ontario
| Cheapest one-way flight price | $19 |
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| Cheapest round-trip ticket price | $45 |
| Off-season for travel | February |
| Peak season for travel | February |
| Flight distance | 11,253.64 km |
| Popular airline | Frontier Airlines |
When is the cheapest time to fly from Denver to Ontario?
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Frequently Asked Questions
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When are flight tickets from Denver (DEN) to Ontario (ONT) the cheapest?
Airlines adjust prices for flights from Denver to Ontario based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays. -
How much do flights from Denver (DEN) to Ontario (ONT) cost?
According to Trip.com's data, the lowest price is around $184.
How to find a cheap flight from Denver to Ontario
Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Denver to Ontario. Book your flights at the right time and save more.
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