Frontier's UpFront Plus guarantees an empty middle seat in the front two rows.
Early check-in helps secure your place onboard due to frequent overbooking.
Round-trip from | $100 (CheapOair) |
---|---|
One-way from | $61 (Priceline) |
Popular in | June |
Cheapest in | January |
Average price | $198 |
Good round-trip deal | $220 or less |
Good one-way deal | $124 or less |
Fly from
Fly to
Route
Depart
Return
Price
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Fri 7/18
5:21 pm-8:44 pm
Nonstop2h 23m
Denver Intl
Tue 7/22
10:29 pm-11:50 pm
Nonstop2h 21m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Wed 7/30
7:00 am-3:18 pm
1 stop7h 18m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Tue 8/19
5:10 am-8:27 am
Nonstop2h 17m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Tue 11/4
4:09 pm-11:59 pm
1 stop6h 50m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Tue 10/21
11:00 am-6:05 pm
2 stops6h 05m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Sun 8/17
6:05 am-11:51 am
1 stop4h 46m
The price you pay for your flight from Ontario to Denver may vary depending on when you book. For the best chance of a lower fare, look to book 55 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Currently, October is the cheapest month in which you can book a flight from Ontario to Denver (average of $197). Flying from Ontario to Denver in March is currently the most expensive (average of $278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
It’s typically best to fly out from Ontario to Denver in the evening. Doing so could potentially save you 55% on the flight price compared to flying at noon, which is usually more expensive.
Travelers seeking maximum savings on their Ontario to Denver flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from ONT to DEN are scheduled on a Monday (13 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 on average).
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
James,Apr 2025
LAX - SFO
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
James,Apr 2025
LAX - SFO
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
James,Apr 2025
LAX - SFO
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
James,Apr 2025
LAX - SFO
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
James,Apr 2025
LAX - SFO
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
James,Apr 2025
LAX - SFO
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$54 | Average$131 | FlexibilityNo cancel fee | On-time62% | |
Cheapest$111 | Average$261 | FlexibilityNo cancel fee | On-time63% | |
Cheapest$135 | Average$272 | FlexibilityNo cancel fee | On-time69% | |
Cheapest$159 | Average$257 | FlexibilityNo cancel fee | On-timeN/A |