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$81+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — ORD
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap 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 July 29, 2025.

Round-trip from

$172
(Frontier)

One-way from

$81
(Southwest)

Popular in

December

Cheapest in

September

Average price

$282

Good round-trip deal

$203 or less

Good one-way deal

$151 or less
From Phoenix Sky Harbor Intl to Illinois
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One-way flight from Phoenix Sky Harbor Intl to Illinois
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Highest demand for flights based on searches. 3% potential increase in price ($9 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Phoenix Sky Harbor Intl to Illinois.
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Price to beat on a one-way flight from Phoenix Sky Harbor Intl to Illinois.
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Find flight deals from Sky Harbor Intl to Illinois

Cheapest flights from Sky Harbor Intl to Illinois
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 July 29, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/28. 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 8/281:35 pmPHX - MDW
Nonstop3h 27mFrontier
Sun 8/314:41 pmMDW - PHX
Nonstop3h 40mFrontier
Deal found 7/28$180
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Thu 10/2312:14 pmPHX - ORD
1 stop9h 31mMultiple Airlines
Sun 10/262:54 pmORD - PHX
Nonstop4h 00mMultiple Airlines
Deal found 7/28$181
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/3012:31 pmPHX - ORD
1 stop20h 06mFrontier
Mon 9/17:35 amORD - PHX
Nonstop3h 50mFrontier
Deal found 7/28$182
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/236:40 amPHX - ORD
Nonstop3h 42mAmerican Airlines
Sat 8/302:30 pmORD - PHX
Nonstop3h 39mAmerican Airlines
Deal found 7/29$188
This Southwest deal was found by Cheapflights users on 7/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/105:40 pmPHX - MDW
Nonstop3h 20mSouthwest
Tue 9/1612:45 pmMDW - PHX
Nonstop3h 40mSouthwest
Deal found 7/27$197
This Southwest deal was found by Cheapflights users on 7/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/272:15 pmPHX - ORD
1 stop7h 25mSouthwest
Sat 8/304:20 pmORD - PHX
Nonstop3h 55mSouthwest
Deal found 7/27$198
This United Airlines deal was found by Cheapflights users on 7/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2112:40 pmPHX - ORD
Nonstop3h 37mUnited Airlines
Tue 8/267:50 pmORD - PHX
Nonstop3h 57mUnited Airlines
Deal found 7/26$207
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/34:30 pmPHX - ORD
1 stop20h 20mAlaska Airlines
Sun 10/58:20 amORD - PHX
1 stop8h 57mAlaska Airlines
Deal found 7/29$228
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Mon 8/186:00 amPHX - STL
1 stop5h 42mMultiple Airlines
Thu 8/212:30 pmSTL - PHX
1 stop9h 07mMultiple Airlines
Deal found 7/28$230
This Cheapflightsfares deal was found by Cheapflights users on 7/27. 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.
Thu 8/2810:42 pmPHX - STL
1 stop12h 50mSpirit Airlines
Sun 8/312:30 pmSTL - PHX
1 stop9h 07mSpirit Airlines
Deal found 7/27$236
This Delta deal was found by Cheapflights users on 7/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/410:19 amPHX - MDW
1 stop9h 07mDelta
Mon 9/84:25 pmMDW - PHX
1 stop8h 24mDelta
Deal found 7/29$237
This American Airlines deal was found by Cheapflights users on 7/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/277:11 pmPHX - STL
Nonstop3h 05mAmerican Airlines
Fri 9/53:59 pmSTL - PHX
1 stop5h 31mAmerican Airlines
Deal found 7/28$246

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 July 29, 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 - MDW

PHXMDW

Phoenix Sky Harbor Intl

Thu 9/25

4:35 pm-9:58 pm

Nonstop3h 23m

Chicago Midway

Sun 9/28

1:53 pm-3:40 pm

Nonstop3h 47m

$172

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Thu 10/23

12:14 pm-11:45 pm

1 stop9h 31m

Chicago O'Hare Intl

Sun 10/26

2:54 pm-4:54 pm

Nonstop4h 00m

$181

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Sat 8/30

12:31 pm-10:37 am

1 stop20h 06m

Chicago O'Hare Intl

Mon 9/1

7:35 am-9:25 am

Nonstop3h 50m

$182

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Sat 8/23

6:40 am-12:22 pm

Nonstop3h 42m

Chicago O'Hare Intl

Sat 8/30

2:30 pm-4:09 pm

Nonstop3h 39m

$188

PhoenixChicago

PHX - MDW

PHXMDW

Phoenix Sky Harbor Intl

Fri 8/29

6:20 pm-11:40 pm

Nonstop3h 20m

Chicago Midway

Sun 8/31

6:20 am-8:00 am

Nonstop3h 40m

$196

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Wed 8/27

2:15 pm-11:40 pm

1 stop7h 25m

Chicago O'Hare Intl

Sat 8/30

4:20 pm-6:15 pm

Nonstop3h 55m

$198

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Thu 8/21

12:40 pm-6:17 pm

Nonstop3h 37m

Chicago O'Hare Intl

Tue 8/26

7:50 pm-9:47 pm

Nonstop3h 57m

$207

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Fri 10/3

4:30 pm-2:50 pm

1 stop20h 20m

Chicago O'Hare Intl

Sun 10/5

8:20 am-3:17 pm

1 stop8h 57m

$228

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 8/18

6:00 am-1:42 pm

1 stop5h 42m

Lambert-St Louis

Thu 8/21

2:30 pm-9:37 pm

1 stop9h 07m

$230

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 8/28

10:42 pm-1:32 pm

1 stop12h 50m

Lambert-St Louis

Sun 8/31

2:30 pm-9:37 pm

1 stop9h 07m

$236

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 58 results
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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, August is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Illinois (average of $245). Flying from Phoenix Sky Harbor Intl Airport to Illinois in March is currently the most expensive (average of $321). 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 July 29, 2025.

When flying from Phoenix Sky Harbor Intl Airport to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 July 29, 2025.

The most flights from PHX to USIL are scheduled on a Monday (54 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (32 on average).

How much does it cost to fly round-trip from Phoenix Sky Harbor Intl Airport to Illinois?

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 July 29, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,977 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Breeze Airways
8.0
Very good
190 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,899 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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.

  • What are the cheapest airlines to fly from Phoenix Sky Harbor Intl Airport to Illinois one-way?

    One-way options have recently been found by users for as low as $81 on Southwest. Other airlines that offer cheap prices include Frontier from $93 and United Airlines from $99 one-way.

  • What are the most popular routes from Phoenix Sky Harbor Intl Airport to Illinois?

    While some choose either Phoenix Sky Harbor Intl - Chicago Midway or Phoenix Sky Harbor Intl - Lambert-St Louis, Phoenix Sky Harbor Intl - Chicago O'Hare Intl is the most popular route from Phoenix Sky Harbor Intl Airport to Illinois.

  • What are the most reliable airlines from Phoenix Sky Harbor Intl Airport to Illinois?

    The top 3 most reliable airlines when flying from Phoenix Sky Harbor Intl Airport to Illinois are Cathay Pacific (90%), SWISS (88%) and Brussels Airlines (87%).

  • What are the cheapest flights from Phoenix Sky Harbor Intl Airport to Illinois?

    Looking at all options, your cheapest flight can be booked for $99. While the most popular route (Phoenix Sky Harbor Intl - Chicago O'Hare Intl) can be booked for $141 on average our data indicates $1,405 when flying from Phoenix Sky Harbor Intl Airport to Illinois.

  • Can I find deals for flights from Sky Harbor Intl to Illinois that include hotel bookings?

    Yes. In addition to deals on Sky Harbor Intl to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Sky Harbor Intl to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sky Harbor Intl to Illinois.

  • Can I find deals for business class flights from Sky Harbor Intl to Illinois?

    Yes. Cheapflights offers flight deals from Sky Harbor Intl to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Phoenix Sky Harbor Intl Airport to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Illinois (average of $245). Flying from Phoenix Sky Harbor Intl Airport to Illinois in March is currently the most expensive (average of $321). 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.

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Alternative routes for Sky Harbor Intl to Illinois

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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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$79Average$200FlexibilityNo cancel feeOn-time65%
FrontierCheapest$87Average$210FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$149Average$328FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$173Average$478FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$199Average$349FlexibilityNo cancel feeOn-time63%
DeltaCheapest$240Average$293FlexibilityNo cancel feeOn-timeN/A

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