
Round-trip from | $99 (CheapOair) |
|---|---|
One-way from | $49 (Frontier) |
Popular in | December |
Cheapest in | February |
Average price | $315 |
Good round-trip deal | $245 or less |
Good one-way deal | $128 or less |
Fly from
Fly to
Route
Depart
Return
Price
PhoenixChicago
PHX - ORD
PHXORD
Phoenix Sky Harbor Intl
Fri 1/23
5:15 pm-9:45 pm
Nonstop3h 30m
Chicago O'Hare Intl
Sun 1/25
7:00 am-2:57 pm
1 stop8h 57m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 1/20
1:00 pm-2:46 pm
1 stop24h 46m
Lambert-St Louis
Sun 2/8
9:32 pm-1:24 pm
1 stop16h 52m
PhoenixChicago
PHX - ORD
PHXORD
Phoenix Sky Harbor Intl
Fri 1/9
3:57 pm-2:17 pm
1 stop21h 20m
Chicago O'Hare Intl
Fri 1/16
3:22 pm-11:36 pm
1 stop9h 14m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 1/6
7:39 pm-10:33 pm
2 stops25h 54m
Lambert-St Louis
Fri 1/9
7:43 pm-1:06 pm
1 stop18h 23m
PhoenixChicago
PHX - ORD
PHXORD
Phoenix Sky Harbor Intl
Thu 4/9
10:03 am-12:12 am
1 stop12h 09m
Chicago O'Hare Intl
Mon 4/13
3:40 pm-9:18 pm
1 stop7h 38m
PhoenixChicago
PHX - ORD
PHXORD
Phoenix Sky Harbor Intl
Wed 3/25
10:24 am-3:59 pm
Nonstop3h 35m
Chicago O'Hare Intl
Sun 3/29
4:13 pm-6:33 pm
Nonstop4h 20m
PhoenixChicago
PHX - ORD
PHXORD
Phoenix Sky Harbor Intl
Tue 2/24
4:27 pm-11:59 pm
1 stop6h 32m
Chicago O'Hare Intl
Sat 2/28
3:07 pm-11:42 pm
1 stop9h 35m
PhoenixChicago
PHX - MDW
PHXMDW
Phoenix Sky Harbor Intl
Tue 1/6
12:10 pm-6:45 pm
1 stop5h 35m
Chicago Midway
Sat 1/10
7:00 am-10:10 am
Nonstop4h 10m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Fri 1/2
10:31 pm-10:02 am
1 stop10h 31m
Lambert-St Louis
Sun 1/4
10:10 pm-8:48 am
1 stop11h 38m
PhoenixChicago
PHX - ORD
PHXORD
Phoenix Sky Harbor Intl
Tue 1/20
11:53 pm-10:05 am
1 stop9h 12m
Chicago O'Hare Intl
Wed 1/21
6:45 pm-12:11 am
1 stop6h 26m
Currently, December is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Illinois (average of $62). Flying from Phoenix Sky Harbor Intl Airport to Illinois in July is currently the most expensive (average of $191). 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 Phoenix Sky Harbor Intl Airport to Illinois in the afternoon. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight at noon.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to Illinois flight should consider departing on Wednesday mornings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from PHX to USIL are scheduled on a Wednesday (45 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (28 on average).
Comfort
Boarding
Food
Crew
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Boarding
Food
Crew
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Boarding
Food
Crew
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Boarding
Food
Crew
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Boarding
Food
Crew
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Boarding
Food
Crew
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$79 | Average$208 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$84 | Average$211 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$149 | Average$335 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$162 | Average$355 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$198 | Average$443 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$200 | Average$338 | FlexibilityNo cancel fee | On-time63% |