$55+ Cheap flights from Phoenix to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ORD
Feb 28 — Mar 71
1 adult, Economy
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Cheapest flights from Phoenix to IllinoisExplore the most affordable flight options available from Phoenix to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.
Explore the most affordable flight options available from Phoenix to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:19 am
PHX
- ORD
Nonstop3h 35m
Frontier
Mon 3/26:00 am
ORD
- PHX
Nonstop4h 09m
Frontier
Deal found 1/28![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1910:19 am
PHX
- ORD
Nonstop3h 35m
Frontier
Mon 2/236:00 am
ORD
- PHX
Nonstop4h 09m
Frontier
Deal found 1/28![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/203:43 pm
PHX
- MDW
Nonstop3h 17m
Frontier
Mon 2/237:25 pm
MDW
- PHX
Nonstop4h 07m
Frontier
Deal found 1/27![Frontier logo]()
$87
This Cheapflightsfares deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/203:42 pm
PHX
- ORD
Nonstop3h 35m
Frontier
Mon 2/236:00 am
ORD
- PHX
Nonstop4h 09m
Frontier
Deal found 1/27![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1812:31 pm
PHX
- ORD
Nonstop3h 32m
Frontier
Mon 2/236:00 am
ORD
- PHX
Nonstop4h 09m
Frontier
Deal found 1/28![Frontier logo]()
$90
This CheapOair deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1812:31 pm
PHX
- ORD
Nonstop3h 32m
Frontier
Sat 2/218:05 am
ORD
- PHX
1 stop16h 39m
Frontier
Deal found 1/28![Frontier logo]()
$92
This Super.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:24 pm
PHX
- MDW
Nonstop3h 17m
Frontier
Sun 3/82:16 pm
MDW
- PHX
Nonstop4h 08m
Frontier
Deal found 1/28![Frontier logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:30 am
PHX
- ORD
1 stop6h 54m
Frontier
Sat 2/287:55 am
ORD
- PHX
Nonstop4h 14m
Frontier
Deal found 1/27![Frontier logo]()
$97
This Cheapflightsfares deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/285:42 pm
PHX
- ORD
1 stop12h 52m
Frontier
Mon 3/97:00 am
ORD
- PHX
Nonstop4h 14m
Frontier
Deal found 1/28![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/285:10 pm
PHX
- ORD
1 stop13h 44m
Multiple Airlines
Tue 3/39:15 am
ORD
- PHX
Nonstop4h 14m
Multiple Airlines
Deal found 1/28![Multiple Airlines logo]()
$102
This Frontier deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2611:59 pm
PHX
- MDW
1 stop13h 27m
Frontier
Mon 3/23:29 pm
MDW
- PHX
Nonstop4h 07m
Frontier
Deal found 1/28![Frontier logo]()
$102
This Super.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/149:22 am
PHX
- MDW
Nonstop3h 27m
Frontier
Mon 5/186:15 am
MDW
- PHX
Nonstop3h 57m
Frontier
Deal found 1/28![Frontier logo]()
$106
Find flight deals from Phoenix to Illinois
Keep the following information in mind while searching for Phoenix to Illinois flight deals. Data was last updated January 29, 2026.
Round-trip from | $78 (Cheapflightsfares) |
|---|---|
One-way from | $55 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $220 |
Cheapflights Fare Finder
Customize your flight search to find flights from Phoenix to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Phoenix to Illinois that are best for you.
Fly from
Phoenix
Fly to
Illinois
Route
Depart
Return
Price
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 2/19
1:22 pm-1:09 pm
1 stop22h 47m
Lambert-St Louis
Mon 2/23
8:47 pm-11:28 pm
Nonstop3h 41m
$125
PhoenixChicago
AZA - RFD
AZARFD
Phoenix-Mesa Gateway
Sat 2/21
7:10 am-11:10 am
Nonstop3h 00m
Chicago Greater Rockford
Mon 2/23
7:51 pm-10:39 pm
Nonstop3h 48m
$147
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Sat 2/28
5:10 pm-6:51 am
2 stops36h 41m
Lambert-St Louis
Wed 3/4
5:18 pm-11:59 pm
1 stop7h 41m
$151
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Mon 2/23
9:39 pm-3:53 pm
2 stops41h 14m
Lambert-St Louis
Mon 3/2
10:11 pm-1:55 pm
1 stop16h 44m
$173
PhoenixChicago
PHX - MDW
PHXMDW
Phoenix Sky Harbor Intl
Thu 3/5
5:10 pm-4:13 pm
1 stop22h 03m
Chicago Midway
Sun 3/8
2:16 pm-4:24 pm
Nonstop4h 08m
$174
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 2/24
8:00 pm-3:53 pm
2 stops18h 53m
Lambert-St Louis
Tue 3/3
3:49 pm-10:12 pm
1 stop31h 23m
$174
PhoenixChicago
AZA - RFD
AZARFD
Phoenix-Mesa Gateway
Sat 2/28
7:10 am-11:10 am
Nonstop3h 00m
Chicago Greater Rockford
Mon 3/9
9:41 pm-11:21 pm
Nonstop3h 40m
$181
PhoenixChicago
AZA - RFD
AZARFD
Phoenix-Mesa Gateway
Wed 2/18
9:00 am-1:00 pm
Nonstop3h 00m
Chicago Greater Rockford
Mon 2/23
7:51 pm-10:39 pm
Nonstop3h 48m
$196
PhoenixChicago
PHX - ORD
PHXORD
Phoenix Sky Harbor Intl
Wed 2/25
6:00 am-4:33 pm
1 stop9h 33m
Chicago O'Hare Intl
Sat 2/28
8:20 am-3:45 pm
1 stop8h 25m
$197
PhoenixChicago
PHX - MDW
PHXMDW
Phoenix Sky Harbor Intl
Fri 3/6
5:50 pm-10:00 pm
Nonstop3h 10m
Chicago Midway
Wed 3/11
5:55 am-7:50 am
Nonstop3h 55m
$197
Showing 1-10 of 60 results
Best time to book a flight from Phoenix to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Phoenix with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Phoenix to Illinois
What is the cheapest month to book a flight from Phoenix to Illinois?
Currently, February is the cheapest month in which you can book a flight from Phoenix to Illinois (average of $62). Flying from Phoenix to Illinois in June is currently the most expensive (average of $178). 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.
What is the cheapest time of day to fly from PHX to IL?
Find hourly flight availability from Phoenix to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 29, 2026.
A simple way to save on the total cost of your ticket is to fly from Phoenix to Illinois in the morning. If you’re flexible enough to do this you can expect to save up to 8% on your trip compared to booking a flight at noon.
What is the cheapest day to fly from Phoenix to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Phoenix to Illinois. Price data was last updated on January 24, 2026.
Travelers seeking maximum savings on their Phoenix to Illinois flight should consider departing on Monday mornings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Phoenix to Illinois
Explore weekly flight availability from Phoenix to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 29, 2026.
The most flights from PH1 to USIL are scheduled on a Monday (43 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (28 on average).
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated January 29, 2026.
See what other customers who have flown with Southwest, United Airlines, and American Airlines from Phoenix to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Phoenix to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Phoenix to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from Phoenix to Illinois
Discover the top 7 airlines that operate flights from Phoenix to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$66 | Average$204 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$79 | Average$166 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$93 | Average$212 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$118 | Average$322 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$149 | Average$335 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$187 | Average$321 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$198 | Average$450 | FlexibilityNo cancel fee | On-time71% |