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Cheap flights from Phoenix Sky Harbor Intl Airport to Illinois from $50

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Phoenix Sky Harbor Intl Airport to Illinois departing on 10/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Phoenix Sky Harbor Intl Airport to Illinois

Cheap round-trip flights

Frontier Logo
3:30 pm - 9:10 pmPHX-ORD
3h 40mnonstop
Frontier Logo
1:53 pm - 3:49 pmORD-PHX
3h 56mnonstop
$137Frontier
Find Deal
Thu, Oct 23 - Mon, Oct 27
Frontier Logo
10:39 am - 4:05 pmPHX-MDW
3h 26mnonstop
Frontier Logo
10:56 pm - 12:47 amMDW-PHX
3h 51mnonstop
$137Frontier
Find Deal
Thu, Oct 16 - Mon, Oct 20
Multiple Airlines Logo
12:01 pm - 10:48 pmPHX-ORD
8h 47m1 stop
Multiple Airlines Logo
10:32 am - 5:13 pmORD-PHX
8h 41m1 stop
$165Multiple Airlines
Find Deal
Fri, Oct 3 - Mon, Oct 6
Multiple Airlines Logo
4:14 pm - 11:53 pmPHX-ORD
5h 39m1 stop
Multiple Airlines Logo
6:40 am - 12:06 pmORD-PHX
7h 26m1 stop
$166Multiple Airlines
Find Deal
Tue, Oct 7 - Tue, Oct 14
American Airlines Logo
6:50 pm - 11:57 pmPHX-STL
3h 07mnonstop
American Airlines Logo
6:21 pm - 7:42 pmSTL-PHX
3h 21mnonstop
$219American Airlines
Find Deal
Mon, Oct 13 - Mon, Oct 20
American Airlines Logo
12:18 am - 8:09 amPHX-STL
5h 51m1 stop
American Airlines Logo
7:31 am - 9:05 amSTL-PHX
3h 34mnonstop
$228American Airlines
Find Deal
Fri, Oct 17 - Sat, Oct 25
Delta Logo
3:20 pm - 11:28 pmPHX-STL
7h 08m1 stop
Delta Logo
2:20 pm - 6:53 pmSTL-PHX
5h 33m1 stop
$237Delta
Find Deal
Sat, Dec 13 - Mon, Dec 15
Delta Logo
6:22 pm - 12:46 amPHX-STL
5h 24m1 stop
Delta Logo
7:56 pm - 12:44 amSTL-PHX
5h 48m1 stop
$277Delta
Find Deal
Mon, Nov 24 - Wed, Dec 3
United Airlines Logo
12:35 pm - 9:05 pmPHX-MLI
6h 30m1 stop
United Airlines Logo
5:29 pm - 12:15 amMLI-PHX
8h 46m2 stops
$281United Airlines
Find Deal
Thu, Oct 23 - Sat, Oct 25
United Airlines Logo
7:00 am - 4:54 pmPHX-MLI
7h 54m1 stop
United Airlines Logo
3:40 pm - 10:00 pmMLI-PHX
8h 20m1 stop
$341United Airlines
Find Deal
Wed, Oct 15 - Wed, Oct 22

Frontier flights from Phoenix Sky Harbor Intl Airport to Illinois

Our best Frontier deals on Phoenix Sky Harbor Intl Airport to Illinois flight tickets
Frontier
Oct 23
PHX3:30 pmPhoenix Sky Harbor Intl
3h 40m
ORD9:10 pmChicago O'Hare Intl
Oct 27
ORD1:53 pmChicago O'Hare Intl
3h 56m
PHX3:49 pmPhoenix Sky Harbor Intl
$137
Find similar
Frontier
Nov 6
PHX8:08 pmPhoenix Sky Harbor Intl
3h 35m
ORD12:43 amChicago O'Hare Intl
Nov 10
ORD3:30 pmChicago O'Hare Intl
4h 04m
PHX6:34 pmPhoenix Sky Harbor Intl
$138
Find similar
Frontier
Oct 30
PHX11:28 amPhoenix Sky Harbor Intl
3h 25m
MDW4:53 pmChicago Midway
Nov 2
MDW9:00 amChicago Midway
3h 54m
PHX11:54 amPhoenix Sky Harbor Intl
$139
Find similar

American Airlines flights from Phoenix Sky Harbor Intl Airport to Illinois

Our best American Airlines deals on Phoenix Sky Harbor Intl Airport to Illinois flight tickets
American Airlines
Oct 13
PHX6:50 pmPhoenix Sky Harbor Intl
3h 07m
STL11:57 pmLambert-St Louis
Oct 20
STL6:21 pmLambert-St Louis
3h 21m
PHX7:42 pmPhoenix Sky Harbor Intl
$219
Find similar
American Airlines
Oct 17
PHX12:18 amPhoenix Sky Harbor Intl
5h 51m
1 stop
STL8:09 amLambert-St Louis
Oct 25
STL7:31 amLambert-St Louis
3h 34m
PHX9:05 amPhoenix Sky Harbor Intl
$228
Find similar
American Airlines
Oct 15
PHX3:25 pmPhoenix Sky Harbor Intl
3h 02m
STL8:27 pmLambert-St Louis
Oct 22
STL7:00 amLambert-St Louis
5h 51m
1 stop
PHX10:51 amPhoenix Sky Harbor Intl
$238
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Phoenix Sky Harbor Intl Airport 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, momondo users made 832,500 searches. Data last updated September 17, 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

Fly to

Route

Depart

Return

Price

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Thu 10/23

3:30 pm-9:10 pm

Nonstop3h 40m

Chicago O'Hare Intl

Mon 10/27

1:53 pm-3:49 pm

Nonstop3h 56m

$137

PhoenixChicago

PHX - MDW

PHXMDW

Phoenix Sky Harbor Intl

Thu 10/16

10:39 am-4:05 pm

Nonstop3h 26m

Chicago Midway

Mon 10/20

10:56 pm-12:47 am

Nonstop3h 51m

$137

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Fri 10/3

12:01 pm-10:48 pm

1 stop8h 47m

Chicago O'Hare Intl

Mon 10/6

10:32 am-5:13 pm

1 stop8h 41m

$165

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Tue 10/7

4:14 pm-11:53 pm

1 stop5h 39m

Chicago O'Hare Intl

Tue 10/14

6:40 am-12:06 pm

1 stop7h 26m

$166

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 10/13

6:50 pm-11:57 pm

Nonstop3h 07m

Lambert-St Louis

Mon 10/20

6:21 pm-7:42 pm

Nonstop3h 21m

$219

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 10/17

12:18 am-8:09 am

1 stop5h 51m

Lambert-St Louis

Sat 10/25

7:31 am-9:05 am

Nonstop3h 34m

$228

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 12/13

3:20 pm-11:28 pm

1 stop7h 08m

Lambert-St Louis

Mon 12/15

2:20 pm-6:53 pm

1 stop5h 33m

$237

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 11/24

6:22 pm-12:46 am

1 stop5h 24m

Lambert-St Louis

Wed 12/3

7:56 pm-12:44 am

1 stop5h 48m

$277

PhoenixMoline

PHX - MLI

PHXMLI

Phoenix Sky Harbor Intl

Thu 10/23

12:35 pm-9:05 pm

1 stop6h 30m

Moline Quad-City

Sat 10/25

5:29 pm-12:15 am

2 stops8h 46m

$281

PhoenixMoline

PHX - MLI

PHXMLI

Phoenix Sky Harbor Intl

Wed 10/15

7:00 am-4:54 pm

1 stop7h 54m

Moline Quad-City

Wed 10/22

3:40 pm-10:00 pm

1 stop8h 20m

$341

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from Phoenix Sky Harbor Intl Airport to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Phoenix Sky Harbor Intl Airport is in January. Flight prices, which tend to average around $217, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $217.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Phoenix Sky Harbor Intl Airport to Illinois is on a Thursday when prices can be found for as low as $350. Flights from Phoenix Sky Harbor Intl Airport to Illinois on a Sunday will generally be more expensive and average around $556. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Phoenix Sky Harbor Intl Airport to Illinois during this time can be as low as $300. Flights at noon are often more expensive with an average ticket price of $515.

What is the cheapest Phoenix Sky Harbor Intl to Illinois flight route?

Fly from Phoenix Sky Harbor Intl to Chicago Midway for the best Phoenix Sky Harbor Intl - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from Phoenix Sky Harbor Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $283 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Phoenix Sky Harbor Intl Airport for as low as $255 on momondo.

What cabin class options are available on Phoenix Sky Harbor Intl to Illinois flights?

There are 4 cabin classes available to choose from on Phoenix Sky Harbor Intl to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Phoenix Sky Harbor Intl Airport to Illinois flights?

You could potentially save up to 3% on your flight if you consider stops on a Phoenix Sky Harbor Intl Airport to Illinois flight.

Cheap Phoenix Sky Harbor Intl Airport to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Phoenix Sky Harbor Intl Airport to Illinois

Best Price Found

$141

Fastest flight time

2h 49m

Direct flights

Every day

Airports in Illinois

1 airport
The best one-way flight to Illinois from Phoenix Sky Harbor Intl Airport in the past 72 hours is $141. The best round-trip flight deal from Phoenix Sky Harbor Intl Airport to Illinois found on momondo in the last 72 hours is $184.
The fastest flight from Phoenix Sky Harbor Intl Airport to Illinois takes 2h 49m
Direct flights go from Phoenix Sky Harbor Intl Airport to Illinois every day.
There is 1 airport near Illinois: Lambert-St Louis (STL)
Search flight deals

  • When did momondo last update prices for flights from Phoenix Sky Harbor Intl Airport to Illinois?

    Prices for flights from Phoenix Sky Harbor Intl Airport to Illinois refresh daily.

  • How many operators does momondo search for flights from Phoenix Sky Harbor Intl Airport to Illinois?

  • How old do you have to be to fly from Phoenix Sky Harbor Intl Airport to Illinois?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix Sky Harbor Intl Airport to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Phoenix Sky Harbor Intl Airport to Illinois?

Best airlines flying from Phoenix Sky Harbor Intl Airport to Illinois

Compare and see reviews for airlines that fly from Phoenix Sky Harbor Intl Airport to Illinois with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $78Free CancellationRating
6.3
8,023 reviews
Search Spirit Airlines flights
FrontierPriceFrom $99Free CancellationRating
5.8
3,173 reviews
Search Frontier flights
United AirlinesPriceFrom $149Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
American AirlinesPriceFrom $189Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $202Free CancellationRating
8.0
4,242 reviews
Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from Phoenix to Illinois?

It is quick and easy to find Phoenix to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

Can I find flights from Phoenix to Illinois with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Illinois from Phoenix with this policy.

How can momondo help me find flights from Phoenix to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Phoenix.

I’m not ready to book a flight from Phoenix to Illinois right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Phoenix to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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