
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $70 (Frontier) |
One-way from | $29 (Expedia) |
Popular in | December |
Cheapest in | January |
Average price | $269 |
Good round-trip deal | $171 or less |
Good one-way deal | $119 or less |
Fly from
Fly to
Route
Depart
Return
Price
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 1/7
5:11 pm-9:49 pm
2 stops29h 38m
Denver Intl
Sat 1/10
6:50 am-10:02 am
Nonstop2h 12m
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 1/7
7:43 pm-9:15 pm
Nonstop2h 32m
Denver Intl
Wed 1/14
10:40 am-12:40 pm
2 stops25h 00m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Sat 1/10
3:59 pm-5:57 pm
Nonstop2h 58m
Denver Intl
Sat 1/17
9:40 am-1:22 pm
Nonstop2h 42m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Thu 1/1
9:40 pm-11:38 pm
Nonstop2h 58m
Denver Intl
Wed 1/7
5:42 pm-9:15 pm
Nonstop2h 33m
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 1/7
7:43 pm-9:15 pm
Nonstop2h 32m
Denver Intl
Wed 1/14
9:20 pm-10:34 pm
3 stops24h 14m
ChicagoDenver
MDW - DEN
MDWDEN
Chicago Midway
Wed 1/7
5:35 pm-7:20 pm
Nonstop2h 45m
Denver Intl
Wed 1/14
9:45 am-1:10 pm
Nonstop2h 25m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Sat 1/24
12:53 pm-2:51 pm
Nonstop2h 58m
Denver Intl
Tue 1/27
5:42 pm-9:15 pm
Nonstop2h 33m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Wed 1/7
8:02 pm-9:59 pm
Nonstop2h 57m
Denver Intl
Tue 1/13
5:42 pm-9:15 pm
Nonstop2h 33m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Sat 1/31
3:59 pm-5:57 pm
Nonstop2h 58m
Denver Intl
Tue 2/3
8:25 pm-11:59 pm
Nonstop2h 34m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Tue 2/17
12:50 pm-2:48 pm
Nonstop2h 58m
Denver Intl
Sat 2/21
5:54 pm-9:29 pm
Nonstop2h 35m
Currently, September is the cheapest month in which you can book a flight from Illinois to Denver (average of $49). Flying from Illinois to Denver in July is currently the most expensive (average of $115). 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.
A simple way to save on the total cost of your ticket is to fly from Illinois to Denver in the evening. If you’re flexible enough to do this you can expect to save up to 46% on your trip compared to booking a flight at noon.
Travelers seeking maximum savings on their Illinois to Denver flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from USIL to DEN are scheduled on a Thursday (46 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 on average).
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$161 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$74 | Average$147 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$153 | Average$358 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$156 | Average$353 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$157 | Average$256 | FlexibilityNo cancel fee | On-time63% |