
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $78 (Frontier) |
One-way from | $48 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $218 |
Good round-trip deal | $219 or less |
Good one-way deal | $136 or less |
Fly from
Fly to
Route
Depart
Return
Price
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Fri 1/16
6:10 am-9:30 am
Nonstop2h 20m
Denver Intl
Tue 1/20
1:34 pm-3:07 pm
Nonstop2h 33m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Thu 1/22
6:20 am-9:40 am
Nonstop2h 20m
Denver Intl
Sun 1/25
10:01 am-7:32 pm
1 stop10h 31m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Fri 2/6
2:28 pm-8:20 pm
1 stop4h 52m
Denver Intl
Mon 2/9
7:10 am-12:10 pm
1 stop6h 00m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Fri 1/23
6:20 am-9:40 am
Nonstop2h 20m
Denver Intl
Mon 1/26
6:20 am-12:43 pm
1 stop7h 23m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Thu 1/29
4:03 pm-11:35 pm
1 stop6h 32m
Denver Intl
Tue 2/3
7:00 am-3:08 pm
1 stop9h 08m
OntarioDurango
ONT - DRO
ONTDRO
Ontario
Tue 1/27
6:22 am-11:17 am
1 stop3h 55m
Durango La Plata County
Tue 2/3
4:48 pm-10:48 pm
1 stop7h 00m
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Fri 1/23
2:28 pm-8:20 pm
1 stop4h 52m
Denver Intl
Sun 1/25
10:01 am-7:32 pm
1 stop10h 31m
OntarioColorado Springs
ONT - COS
ONTCOS
Ontario
Wed 3/4
6:00 am-11:15 am
1 stop4h 15m
Colorado Springs
Tue 3/10
12:10 pm-4:28 pm
1 stop5h 18m
OntarioColorado Springs
ONT - COS
ONTCOS
Ontario
Tue 3/3
6:00 am-11:15 am
1 stop4h 15m
Colorado Springs
Wed 3/11
7:55 am-12:23 pm
1 stop5h 28m
OntarioGrand Junction
ONT - GJT
ONTGJT
Ontario
Fri 1/16
5:05 am-10:54 am
1 stop4h 49m
Grand Junction Regnl
Sun 1/18
7:00 am-5:43 pm
2 stops11h 43m
Currently, March is the cheapest month in which you can book a flight from Ontario to Colorado (average of $36). Flying from Ontario to Colorado in September is currently the most expensive (average of $76). 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 Colorado 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 Colorado flight should consider departing on Tuesday evenings 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 USCO are scheduled on a Monday (11 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).
Entertainment
Crew
Overall
Food
Comfort
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Crew
Overall
Food
Comfort
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Crew
Overall
Food
Comfort
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Crew
Overall
Food
Comfort
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Crew
Overall
Food
Comfort
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Crew
Overall
Food
Comfort
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$59 | Average$148 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$109 | Average$265 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$117 | Average$315 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$138 | Average$349 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$268 | Average$386 | FlexibilityNo cancel fee | On-time71% |