For a quick departure, use the A Line train to reach DEN from Union Station in 37 minutes, avoiding traffic hassles.
Round-trip from | $115 (CheapOair) |
---|---|
One-way from | $59 (Frontier) |
Popular in | June |
Cheapest in | January |
Average price | $193 |
Good round-trip deal | $163 or less |
Good one-way deal | $117 or less |
Fly from
Fly to
Route
Depart
Return
Price
DenverOntario
DEN - ONT
DENONT
Denver Intl
Fri 7/11
10:29 pm-4:20 pm
1 stop18h 51m
Ontario
Mon 7/14
9:41 pm-10:17 am
1 stop11h 36m
DenverOntario
DEN - ONT
DENONT
Denver Intl
Sat 8/9
10:29 pm-11:50 pm
Nonstop2h 21m
DenverOntario
DEN - ONT
DENONT
Denver Intl
Thu 9/4
6:17 pm-11:54 pm
1 stop6h 37m
DenverOntario
DEN - ONT
DENONT
Denver Intl
Mon 9/1
5:25 am-10:15 am
1 stop5h 50m
DenverOntario
DEN - ONT
DENONT
Denver Intl
Wed 7/30
6:00 am-1:26 pm
1 stop8h 26m
DenverOntario
DEN - ONT
DENONT
Denver Intl
Tue 7/22
7:10 am-12:14 pm
1 stop6h 04m
The price you pay for your flight from Denver to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 40 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Currently, August is the cheapest month in which you can book a flight from Denver to Ontario (average of $246). Flying from Denver to Ontario in March is currently the most expensive (average of $328). 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.
One of the essential ways to save on airfare from Denver to Ontario is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 26% on airfare.
Travelers seeking maximum savings on their Denver to Ontario flight should consider departing on Tuesday evenings when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from DEN to ONT are scheduled on a Thursday (12 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (8 on average).
Boarding
Entertainment
Overall
Comfort
Food
Crew
Reviews
James,Apr 2025
LAX - SFO
Boarding
Entertainment
Overall
Comfort
Food
Crew
Reviews
James,Apr 2025
LAX - SFO
Boarding
Entertainment
Overall
Comfort
Food
Crew
Reviews
James,Apr 2025
LAX - SFO
Boarding
Entertainment
Overall
Comfort
Food
Crew
Reviews
James,Apr 2025
LAX - SFO
Boarding
Entertainment
Overall
Comfort
Food
Crew
Reviews
James,Apr 2025
LAX - SFO
Boarding
Entertainment
Overall
Comfort
Food
Crew
Reviews
James,Apr 2025
LAX - SFO
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$56 | Average$138 | FlexibilityNo cancel fee | On-time62% | |
Cheapest$118 | Average$249 | FlexibilityNo cancel fee | On-time63% | |
Cheapest$140 | Average$287 | FlexibilityNo cancel fee | On-time69% |