Cheap flight from Ontario to Denver from $28
We've found these cheap flights for you. You can book one-way or round-trip flight tickets.
Swipe up to view more
>
>
>
>
>
Flights from Ontario to Denver
Cheap flight deals from Ontario to Denver
We've found these cheap flights for you. You can book one-way or round-trip flight tickets.
-
Round-trip
-
One way
-
-
Cheapest nonstop
ONT 12:16 PM2h 19mNonstopDEN 3:35 PMOntario - Denver | Tue, May 6 | Frontier Airlines
DEN 10:38 PM2h 21mNonstopSIN 11:59 PMDenver - Ontario | Sat, May 10 | Frontier Airlines$41 $32587% OFF87% OFF$325 $41 -
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Thu, May 8 | Frontier Airlines
DEN 10:00 AM2h 26mNonstopSIN 11:26 AMDenver - Ontario | Tue, May 13 | Frontier Airlines$44 $32586% OFF86% OFF$325 $44
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Wed, May 7 | Frontier Airlines
DEN 10:37 PM2h 22mNonstopSIN 11:59 PMDenver - Ontario | Fri, May 9 | Frontier Airlines$49 $32585% OFF85% OFF$325 $49
-
ONT 12:16 PM2h 19mNonstopDEN 3:35 PMOntario - Denver | Fri, May 9 | Frontier Airlines
DEN 10:37 PM2h 22mNonstopSIN 11:59 PMDenver - Ontario | Sat, May 10 | Frontier Airlines$6082% OFF$325 $60
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Tue, May 13 | Frontier Airlines
DEN 9:43 PM2h 25mNonstopSIN 11:08 PMDenver - Ontario | Wed, May 14 | Frontier Airlines$6181% OFF$325 $61
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Tue, May 20 | Frontier Airlines
DEN 10:55 PM2h 37mNonstopSIN 12:32 AMDenver - Ontario | Tue, May 27 | Frontier Airlines$12960% OFF$325 $129
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Sat, May 10 | Frontier Airlines
DEN 8:15 AM2h 37mNonstopSIN 9:52 AMDenver - Ontario | Tue, May 13 | Frontier Airlines$21933% OFF$325 $219
-
ONT 12:16 PM2h 19mNonstopDEN 3:35 PMOntario - Denver | Sun, May 11 | Frontier Airlines
DEN 9:43 PM2h 25mNonstopSIN 11:08 PMDenver - Ontario | Wed, May 14 | Frontier Airlines$23328% OFF$325 $233
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Mon, May 12 | Frontier Airlines
DEN 10:38 PM2h 21mNonstopSIN 11:59 PMDenver - Ontario | Fri, May 16 | Frontier Airlines$26319% OFF$325 $263
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Mon, May 5 | Frontier Airlines
DEN 10:38 PM2h 21mNonstopSIN 11:59 PMDenver - Ontario | Thu, May 8 | Frontier Airlines$3056% OFF$325 $305
-
ONT 1:00 PM17h 25m1 stopsDEN Invalid DateOntario - Denver | Tue, May 6 | Normal Airline
DEN 3:00 PM6hNonstopONT 4:00 PMDenver - Ontario | Thu, May 8 | Normal AirlineFind More FlightsFind More Flights
-
Cheapest nonstop
ONT 12:16 PM2h 19mNonstopDEN 3:35 PMOntario - Denver | Tue, May 6 | Frontier Airlines$28 $16283% OFF83% OFF$162 $28
-
ONT 12:59 AM2h 19mNonstopDEN 4:18 AMOntario - Denver | Tue, Jun 3 | Frontier Airlines$59 $16263% OFF63% OFF$162 $59
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Sun, May 18 | Frontier Airlines$65 $16260% OFF60% OFF$162 $65
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Mon, May 19 | Frontier Airlines$6560% OFF$162 $65
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Tue, May 13 | Frontier Airlines$10038% OFF$162 $100
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Sun, May 11 | Frontier Airlines$13020% OFF$162 $130
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Mon, May 12 | Frontier Airlines$13119% OFF$162 $131
-
ONT 12:59 AM2h 18mNonstopDEN 4:17 AMOntario - Denver | Wed, May 7 | Frontier Airlines$1507% OFF$162 $150
-
ONT 12:16 PM2h 19mNonstopDEN 3:35 PMOntario - Denver | Fri, May 9 | Frontier Airlines$1516% OFF$162 $151
-
ONT 12:08 AM2h 18mNonstopDEN 3:26 AMOntario - Denver | Thu, May 8 | Frontier Airlines$1526% OFF$162 $152
-
ONT 1:00 PM17h 25m1 stopsDEN Invalid DateOntario - Denver | Tue, May 6 | Normal AirlineFind More FlightsFind More Flights
-
Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
When is the cheapest time to fly from Ontario to Denver?
We monitor flight fares to help you find the best deals effortlessly
Cheapest flights
From price
Search
Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Frequently Asked Questions
-
When are flight tickets from Ontario (ONT) to Denver (DEN) the cheapest?
Airlines adjust prices for flights from Ontario to Denver 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 Ontario (ONT) to Denver (DEN) cost?
According to Trip.com's data, the lowest price is around $179.
How to find a cheap flight from Ontario to Denver
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 Ontario to Denver. Book your flights at the right time and save more.
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
Compare Flight Prices
Compare prices on travel agency and airline websites.
Look Out for Deals
Check airline and travel agency websites for latest flight deals
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com
Flight Info | Ontario to Denver
| Cheapest one-way flight price | $27 |
|---|---|
| Cheapest round-trip ticket price | $41 |
| Off-season for travel | February |
| Peak season for travel | September |
| Flight distance | 11,253.64 km |
| Popular airline | Frontier Airlines |