Frontier offers extra comfort seats with 32” separation for a fee, enhancing travel comfort.
Frontier's Zone 1 boarding is available with a carry-on purchase or special fare bundle.

Most accurate provider | CheapOair 3 stars  | 
|---|---|
Most trusted provider | CheapOair 3 stars  | 
Round-trip from | $94 (Cheapflightsfares)  | 
One-way from | $71 (Cheapflightsfares)  | 
Popular in | December | 
Cheapest in | November | 
Average price | $179 | 
Good round-trip deal | $178 or less | 
Good one-way deal | $133 or less | 
Fly from
Fly to
Route
Depart
Return
Price
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Wed 1/21
6:15 pm-8:13 pm
Nonstop2h 58m
Denver Intl
Sun 1/25
6:00 am-9:44 am
Nonstop2h 44m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Sat 12/13
10:45 am-5:27 pm
1 stop7h 42m
Denver Intl
Tue 12/16
1:16 pm-10:43 pm
1 stop8h 27m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Sat 12/13
2:15 pm-7:30 pm
1 stop6h 15m
Denver Intl
Tue 12/16
7:30 am-3:25 pm
1 stop6h 55m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Tue 12/2
6:00 am-10:07 am
1 stop5h 07m
Denver Intl
Tue 12/2
4:15 pm-9:40 pm
1 stop4h 25m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Wed 12/3
6:00 am-12:53 pm
1 stop7h 53m
Denver Intl
Sat 12/6
5:45 am-3:20 pm
1 stop8h 35m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Mon 11/24
5:42 pm-11:14 pm
1 stop6h 32m
Denver Intl
Thu 11/27
11:08 am-4:52 pm
1 stop4h 44m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Wed 12/24
1:22 pm-7:30 pm
1 stop7h 08m
Denver Intl
Wed 12/31
3:02 pm-9:34 pm
1 stop5h 32m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Fri 1/23
6:50 am-1:35 pm
1 stop7h 45m
Denver Intl
Mon 1/26
7:10 am-3:19 pm
1 stop7h 09m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Tue 12/2
6:00 am-10:07 am
1 stop5h 07m
Denver Intl
Tue 12/9
1:59 pm-9:40 pm
1 stop6h 41m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Thu 1/8
1:45 pm-9:05 pm
2 stops8h 20m
Denver Intl
Mon 1/12
6:00 am-1:30 pm
1 stop6h 30m
| Provider | Price Accuracy | Trust Score* | 
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | 
The best time to book flights from Chicago O'Hare Intl Airport to Denver is 90 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, March is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Denver (average of $52). Flying from Chicago O'Hare Intl Airport to Denver in June is currently the most expensive (average of $116). 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 optimal to fly from Chicago O'Hare Intl Airport to Denver in the morning. By choosing this option you can save up to 21% on the cost of your flight, compared to a flight at noon.
Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to Denver flight should consider departing on Wednesday mornings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
About 19% of weekly flights between Chicago and Denver have experienced delays in the past year, with the average delay time being 152 minutes.
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
Monday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Volaris have had the lowest number of delays on this route, with just 12% of flights being delayed.
Entertainment
Food
Crew
Overall
Boarding
Comfort
Reviews
Gina,Jul 2025
LAS - DEN
Entertainment
Food
Crew
Overall
Boarding
Comfort
Reviews
Gina,Jul 2025
LAS - DEN
Entertainment
Food
Crew
Overall
Boarding
Comfort
Reviews
Gina,Jul 2025
LAS - DEN
Entertainment
Food
Crew
Overall
Boarding
Comfort
Reviews
Gina,Jul 2025
LAS - DEN
Entertainment
Food
Crew
Overall
Boarding
Comfort
Reviews
Gina,Jul 2025
LAS - DEN
| Airline | Cheapest | Average | Flexibility | On-time | 
|---|---|---|---|---|
| Cheapest$58 | Average$149 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$153 | Average$231 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$157 | Average$248 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$160 | Average$283 | FlexibilityNo cancel fee | On-time69% |