$49+ Cheap flights from Sky Harbor Intl (PHX) 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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ORD
Jan 11 — Jan 181
1 adult, Economy
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Cheapest flights from Sky Harbor Intl to IllinoisExplore the most affordable flight options available from Sky Harbor Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.
Explore the most affordable flight options available from Sky Harbor Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.
This Cheapflightsfares deal was found by Cheapflights users on 12/11. 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 12/253:40 pmPHX - ORD
Nonstop3h 43mFrontier
Thu 1/19:33 pmORD - PHX
Nonstop3h 54mFrontier
Deal found 12/11![Frontier logo]()
$127
This CheapOair deal was found by Cheapflights users on 12/10. 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.
Mon 12/2910:31 pmPHX - ORD
1 stop24h 41mFrontier
Fri 1/308:15 amORD - PHX
1 stop9h 41mFrontier
Deal found 12/10![Frontier logo]()
$156
This CheapOair deal was found by Cheapflights users on 12/10. 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.
Mon 12/2910:31 pmPHX - ORD
1 stop24h 41mFrontier
Sat 1/318:00 amORD - PHX
Nonstop4h 11mFrontier
Deal found 12/10![Frontier logo]()
$161
This Super.com deal was found by Cheapflights users on 12/9. 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.
Wed 12/243:43 pmPHX - ORD
1 stop7h 29mFrontier
Mon 1/51:32 pmORD - PHX
Nonstop4h 08mFrontier
Deal found 12/9![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 12/11. 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.
Wed 12/243:43 pmPHX - ORD
1 stop7h 29mFrontier
Thu 1/17:00 amORD - PHX
1 stop8h 33mFrontier
Deal found 12/11![Frontier logo]()
$174
This Expedia deal was found by Cheapflights users on 12/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2910:31 pmPHX - MDW
1 stop20h 24mFrontier
Fri 1/306:20 amMDW - PHX
1 stop10h 02mFrontier
Deal found 12/10![Frontier logo]()
$176
This Expedia deal was found by Cheapflights users on 12/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2910:31 pmPHX - ORD
1 stop24h 41mFrontier
Mon 1/51:32 pmORD - PHX
Nonstop4h 08mFrontier
Deal found 12/11![Frontier logo]()
$177
This Cheapflightsfares deal was found by Cheapflights users on 12/11. 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.
Mon 12/2910:31 pmPHX - ORD
1 stop24h 41mFrontier
Thu 1/19:33 pmORD - PHX
Nonstop3h 54mFrontier
Deal found 12/11![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
Wed 12/319:31 amPHX - ORD
1 stop13h 41mFrontier
Sun 1/410:49 pmORD - PHX
1 stop10h 59mFrontier
Deal found 12/9![Frontier logo]()
$182
This Expedia deal was found by Cheapflights users on 12/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:31 amPHX - STL
1 stop23h 31mFrontier
Sat 1/37:43 pmSTL - PHX
1 stop6h 01mFrontier
Deal found 12/10![Frontier logo]()
$183
This Super.com deal was found by Cheapflights users on 12/10. 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 12/263:50 pmPHX - STL
Nonstop2h 57mFrontier
Fri 1/28:42 pmSTL - PHX
Nonstop3h 31mFrontier
Deal found 12/10![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
Sun 12/286:05 amPHX - MDW
1 stop6h 54mFrontier
Wed 12/312:16 pmMDW - PHX
1 stop11h 19mFrontier
Deal found 12/9![Frontier logo]()
$191
Find flight deals from Sky Harbor Intl to Illinois
Keep the following information in mind while searching for Sky Harbor Intl to Illinois flight deals. Data was last updated December 12, 2025.
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 |
Cheapflights Fare Finder
Customize your flight search to find flights from Sky Harbor Intl 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 December 12, 2025.
Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to Illinois that are best for you.
Fly from
Sky Harbor Intl
Fly to
Illinois
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
$108
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
$177
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
$179
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
$181
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
$182
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
$188
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
$197
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
$197
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
$208
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
$217
Showing 1-10 of 60 results
Best time to book a flight from Sky Harbor Intl to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Sky Harbor Intl 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 Sky Harbor Intl Airport to Illinois
What is the cheapest month to book a flight from Phoenix Sky Harbor Intl Airport to Illinois?
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.
What is the cheapest time of day to fly from PHX to IL?
Find hourly flight availability from Sky Harbor Intl 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 December 12, 2025.
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.
What is the cheapest day to fly from Phoenix Sky Harbor Intl Airport to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Sky Harbor Intl to Illinois. Price data was last updated on December 16, 2024.
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.
Weekly flight availability from Phoenix Sky Harbor Intl Airport to Illinois
Explore weekly flight availability from Sky Harbor Intl 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 December 12, 2025.
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).
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 December 12, 2025.
Read reviews from past customers who have flown Southwest, United Airlines, and American Airlines from Phoenix Sky Harbor Intl Airport to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Sky Harbor Intl 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 Sky Harbor Intl to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from Sky Harbor Intl to Illinois
Discover the top 6 airlines that operate flights from Sky Harbor Intl 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 December 12, 2025.
| 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% |