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Cheap flights Ontario — Denver

Ontario (ONT, US) Denver (DEN, US)
from $37 1 289 km ~2h 1m 7 flights found 1 airlines cheapest on Thursday
Reverse route
How many travellers?
Adults
12+ years
1
Children
2–11 years
0
Infants
under 2
0
Choose your departure date
Cheapest: $37 on 31.12.2026
Prices shown are from searches by other travellers over the last 24 hours. Missing a date? Click any day — we'll find tickets anyway.
November 2026
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December 2026
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January 2027
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Prices found for 2 of 90 days. Prices update as more travellers search. Click any date to search live.
Depart
—
Return
—
Cheapest flights found
31 Dec 2026, Thu
Frontier Airlines F9 1500
17:20
ONT Ontario International Airport
19:44
DEN Denver International Airport
2h 24m Direct
Trip.com
$37
View this ticket
22 Nov 2026, Sun
Frontier Airlines F9 2908
22:40
ONT Ontario International Airport
01:01
DEN Denver International Airport
2h 21m Direct
Farera
$69
View this ticket
Route characteristics
Distance
1 289 km
Flight time
2h 1m
Time difference
+1h
Minimum price
from $37 (31.12.2026)
Average price
$53
Maximum price
$69
Departures per week
1
Cheapest day
Thursday
Departure airports (1)
ONT Ontario International Airport
Arrival airports (1)
DEN Denver International Airport
Airlines (1)
F9 Frontier Airlines
Agencies (2)
Farera Trip.com
Prices by day of week
Thursday
$37
avg $37
Cheapest
Sunday
$69
avg $69
Price trend by month
November 2026
from $69
avg $69
1 flights
December 2026
from $37
avg $37
1 flights
Airlines — cheapest prices 1
Frontier Airlines
Frontier Airlines
Low-cost 7 flights · 6 days
$32
Where to buy tickets 2
Farera
6 tickets · 5 days
from $32
Trip.com
1 tickets · 1 days
from $37
Airports

From — Ontario (1)

  • ONT Ontario International Airport

To — Denver (1)

  • DEN Denver International Airport
Other destinations from Ontario
Albuquerque
US
Accra
GH
Nantucket
US
Adelaide
AU
San Andres Island
CO
Malaga
ES · Hub
Auckland
NZ
Almaty
KZ
Alicante
ES
Ahmedabad
IN
Amsterdam
NL · Hub
Anchorage
US
Frequently asked questions about the route Ontario — Denver
How long is the flight from Ontario to Denver?
Approximate flight time — 2h 1m. This is an average for a direct flight. With connections, the time may be longer.
What is the distance from Ontario to Denver?
The straight-line distance — 1 289 km.
How much do flights from Ontario to Denver cost?
The minimum price over 3 months — from $37 on 31.12.2026.
What is the average ticket price?
The average price — $53. Range: $37 — $69.
What is the time difference between Ontario and Denver?
The difference — +1h.
From which airports does Ontario operate flights?
From Ontario: ONT (Ontario International Airport).
To which airports in Denver do flights arrive?
To Denver: DEN (Denver International Airport).
Which airlines fly this route?
This route is served by 1 airline: Frontier Airlines.
Are there direct flights?
Yes, there are direct flights. Minimum direct price — from $37. Total direct flights found: 2.
Which day of the week is cheapest?
The cheapest day of the week — Thursday.
When is the best time to buy tickets?
Optimal — 1–3 months before departure. Check the calendar above — it shows the best dates.
How do I book flights?
Click "View this ticket" on any flight card — you'll be redirected to the booking page with this specific ticket pre-selected.
About the route Ontario — Denver

Flights Ontario — Denver is a popular route. The straight-line distance is 1 289 km. Flight time 2h 1m. Time difference +1h.

From Ontario (ONT) flights depart from 1 airport: ONT. To Denver (DEN) — 1 arrival airport: DEN.

1 airline operate on this route: Frontier Airlines.

The minimum price for the next 3 months — from $37 (31.12.2026). The cheapest dates are highlighted in the calendar above.

The average ticket price — $53, ranging from $37 to $69. Book 1–3 months in advance to get the best deals.

Cheapest day to fly — Thursday.

Other destinations in United States from Ontario
Phoenix
US
Omaha
US
Orlando
US
Everett
US
West Palm Beach
US
Portland
US
Philadelphia
US
Providence
US

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