Frontier's UpFront Plus seats offer a guaranteed empty middle seat for added comfort.
Frontier offers Zone 1 boarding for carry-on bag purchasers and Elite members.

Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $99 (CheapOair) |
One-way from | $64 (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
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
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
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
PhoenixChicago
PHX - ORD
PHXORD
Phoenix Sky Harbor Intl
Fri 1/23
12:59 am-10:25 am
1 stop8h 26m
Chicago O'Hare Intl
Sat 1/24
3:24 pm-11:46 pm
1 stop9h 22m
PhoenixChicago
PHX - MDW
PHXMDW
Phoenix Sky Harbor Intl
Wed 1/7
11:55 am-10:07 pm
1 stop9h 12m
Chicago Midway
Wed 1/14
11:21 am-7:13 pm
1 stop8h 52m
PhoenixChicago
PHX - MDW
PHXMDW
Phoenix Sky Harbor Intl
Tue 2/24
1:55 pm-10:44 pm
1 stop7h 49m
Chicago Midway
Sat 2/28
1:28 pm-7:38 pm
1 stop7h 10m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars |
Booking 22 days in advance of your planned departure date is, on average, the best time to get cheap flights from Phoenix Sky Harbor Intl Airport to Chicago. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, December is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Chicago (average of $62). Flying from Phoenix Sky Harbor Intl Airport to Chicago 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.
One of the essential ways to save on airfare from Phoenix Sky Harbor Intl Airport to Chicago is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 32% on airfare.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to Chicago flight should consider departing on Wednesday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from PHX to CHI are scheduled on a Wednesday (53 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (28 on average).
Las Vegas (LAS) – chosen by Cheapflights users on 40% of 1-stop itineraries from Phoenix Sky Harbor Intl Airport to Chicago on Cheapflights.
Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $128.
Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 5h 10m.
Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 0h 53m.
About 9% of weekly flights between Phoenix and Chicago have experienced delays in the past year, with the average delay time being 159 minutes.
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
Friday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
Over the last year, United Airlines have had the lowest number of delays on this route, with just 6% of flights being delayed.
Overall
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Comfort
Food
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Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Boarding
Comfort
Food
Crew
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Thomas,Dec 2025
SEA - DEN
Overall
Boarding
Comfort
Food
Crew
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Boarding
Comfort
Food
Crew
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Boarding
Comfort
Food
Crew
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Boarding
Comfort
Food
Crew
Entertainment
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$298 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$162 | Average$355 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$198 | Average$309 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$200 | Average$338 | FlexibilityNo cancel fee | On-time63% |