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Cheap flights Ontario to Denver

1 passenger, economy

Cheap flights Ontario to Denver

Compare prices, duration and stops

Frontier Airlines
F9 2908
18:45
Ontario (ONT)
Wed, 9 sep
2h 22min
Direct
21:07
Denver (DEN)
Wed, 9 sep
158 NZ$
Frontier Airlines
F9 2232
15:00
Ontario (ONT)
Thu, 10 sep
6h
1 stop
21:00
Denver (DEN)
Thu, 10 sep
214 NZ$
Frontier Airlines
F9 1500 🔥 Hot deal
13:15
Ontario (ONT)
Fri, 11 sep
2h 20min
Direct
15:35
Denver (DEN)
Fri, 11 sep
108 NZ$
Frontier Airlines
F9 2908 Best price
18:45
Ontario (ONT)
Fri, 11 sep
2h 22min
Direct
21:07
Denver (DEN)
Fri, 11 sep
56 NZ$
Frontier Airlines
F9 2232
17:04
Ontario (ONT)
Sat, 12 sep
7h 7min
1 stop
00:11
Denver (DEN)
Sun, 13 sep +1
262 NZ$
Frontier Airlines
F9 1159
19:07
Ontario (ONT)
Sun, 13 sep
9h 19min
1 stop
04:26
Denver (DEN)
Mon, 14 sep +1
261 NZ$
Frontier Airlines
F9 2232 🔥 Hot deal
15:00
Ontario (ONT)
Thu, 17 sep
3h 51min
1 stop
18:51
Denver (DEN)
Thu, 17 sep
187 NZ$
Frontier Airlines
F9 3132
01:45
Ontario (ONT)
Mon, 28 sep
12h 20min
1 stop
14:05
Denver (DEN)
Mon, 28 sep
228 NZ$
Frontier Airlines
F9 4206 🔥 Hot deal
03:24
Ontario (ONT)
Mon, 28 sep
26h 20min
1 stop
05:44
Denver (DEN)
Tue, 29 sep +1
168 NZ$
Frontier Airlines
F9 1500 🔥 Hot deal
13:15
Ontario (ONT)
Thu, 1 oct
2h 20min
Direct
15:35
Denver (DEN)
Thu, 1 oct
60 NZ$

Low price calendar

September 2026
Price chart (September 2026)
min: 56 NZ$ · max: 262 NZ$
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56 NZ$
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262 NZ$
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247 NZ$
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Cheap flights Ontario to Denver

Frontier Airlines
Frontier Airlines
Mon, Wed, Thu, Fri, Sat, Sun
Price from
NZ$158

Popular destinations from Ontario

All →
ONT
Ontario — San Francisco
United States → United States
SFO
from
NZ$32
ONT
Ontario — Las Vegas
United States → United States
LAS
from
NZ$32
ONT
Ontario — Seattle
United States → United States
SEA
from
NZ$54
ONT
Ontario — Oakland
United States → United States
OAK
from
NZ$58
ONT
Ontario — Houston
United States → United States
HOU
from
NZ$63
ONT
Ontario — San Jose
United States → United States
SJC
from
NZ$68
ONT
Ontario — Dallas
United States → United States
DFW
from
NZ$91
ONT
Ontario — Sacramento
United States → United States
SAC
from
NZ$114

Popular destinations to Denver

All →
PHX
Phoenix — Denver
United States → United States
DEN
from
NZ$37
CHI
Chicago — Denver
United States → United States
DEN
from
NZ$40
SLC
Salt Lake City — Denver
United States → United States
DEN
from
NZ$42
SEA
Seattle — Denver
United States → United States
DEN
from
NZ$43
ATL
Atlanta — Denver
United States → United States
DEN
from
NZ$43
DFW
Dallas — Denver
United States → United States
DEN
from
NZ$43
AUS
Austin — Denver
United States → United States
DEN
from
NZ$43
LAX
Los Angeles — Denver
United States → United States
DEN
from
NZ$44
MSP
Minneapolis — Denver
United States → United States
DEN
from
NZ$50

Cheap flights Ontario to Denver

Interesting facts about the route

Flight time

5h 1min

Distance

1 314 km

Average price

NZ$187

Most frequent flight

F9 2232

Passenger reviews

No reviews for this route yet

Internet abroad

eSIM · United States

All plans

change

3 GB

data

30

days

NZ$15

Buy

change

2 GB

data

15

days

NZ$21

Buy

change

5 GB

data

30

days

NZ$24

Buy

change

3 GB

data

30

days

NZ$27

Buy

change

5 GB

data

30

days

NZ$38

Buy

Frequently Asked Questions

The average ticket price Ontario Denver is NZ$187. The cheapest ticket costs NZ$56, operated by Frontier Airlines, flight 2908, departing Ontario on 11 September at 18:45, arriving Denver on 11 September at 21:07.
The average flight time is 6 hours. The fastest flight takes 2 hours 22 minutes, flight 2908 operated by Frontier Airlines, departing Ontario on 9 September at 18:45, arriving Denver on 9 September at 21:07.
Flights on the Ontario - Denver route are operated by the following airlines: Frontier Airlines.
The distance from Ontario to Denver is 1314 km.