How does KAYAK find such low prices on flights from Illinois to Phoenix?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Phoenix.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Phoenix?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Phoenix from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to Phoenix?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Phoenix with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Phoenix?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Phoenix from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$82 CHEAP FLIGHTS from Illinois to Phoenix (PHX)

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Flight Deals

Cheap Flights from Illinois to Phoenix

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Phoenix

Wed, Sep 30 - Wed, Oct 7

8:10 pm - 11:43 pmSTL Lambert-St Louis-PHX Phoenix Sky Harbor Intl

5h 33m1 stop Denver Intl

9:15 am - 7:17 pmPHX Phoenix Sky Harbor Intl-STL Lambert-St Louis

8h 02m1 stop Denver Intl

$165Frontier

Sat, Oct 3 - Wed, Oct 7

8:10 pm - 11:43 pmSTL Lambert-St Louis-PHX Phoenix Sky Harbor Intl

5h 33m1 stop Denver Intl

6:25 am - 7:17 pmPHX Phoenix Sky Harbor Intl-STL Lambert-St Louis

10h 52m1 stop Denver Intl

$165Frontier

Wed, Feb 24 - Sat, Feb 27

2:54 pm - 11:16 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

9h 22m1 stop San Diego

7:01 am - 1:54 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

5h 53m1 stop San Diego

$247Alaska Airlines

Wed, Feb 10 - Tue, Feb 16

2:13 pm - 10:37 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

9h 24m1 stop San Diego

10:35 am - 6:55 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

7h 20m1 stop San Diego

$247Alaska Airlines

Thu, Dec 3 - Tue, Dec 8

9:42 pm - 12:47 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 05mnonstop

3:15 pm - 11:59 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

7h 44m1 stop San Diego

$247Multiple Airlines

Fri, Nov 6 - Mon, Nov 9

5:15 pm - 11:09 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

6h 54m1 stop Las Vegas Harry Reid Intl

8:22 pm - 1:17 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

15h 55m1 stop San Diego

$251Multiple Airlines

Thu, Oct 1 - Mon, Oct 5

8:30 pm - 10:24 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 54mnonstop

9:00 am - 2:44 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 44mnonstop

$267United Airlines

Tue, Sep 29 - Tue, Sep 29

4:45 pm - 6:38 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 53mnonstop

11:52 pm - 5:20 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 28mnonstop

$267United Airlines

Wed, Feb 10 - Tue, Feb 16

9:29 pm - 12:32 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 03mnonstop

7:04 pm - 11:35 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 31mnonstop

$267American Airlines

Sat, Nov 14 - Sat, Nov 21

9:30 pm - 12:32 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 02mnonstop

5:00 am - 9:37 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 37mnonstop

$267American Airlines

Recent last minute flight deals from Illinois to Phoenix

Wed, Sep 9 - Fri, Sep 11

6:30 am - 7:51 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

15h 21m1 stop Denver Intl

9:15 am - 12:23 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

13h 08m1 stop Denver Intl

$246Frontier

Wed, Sep 9 - Thu, Sep 24

6:30 am - 12:35 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

8h 05m1 stop Denver Intl

3:21 pm - 12:23 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

7h 02m1 stop Denver Intl

$249Frontier

Wed, Sep 9 - Tue, Sep 22

11:00 am - 12:56 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 56mnonstop

7:10 am - 12:49 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 39mnonstop

$286United Airlines

Wed, Sep 9 - Wed, Oct 7

1:45 pm - 3:35 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 50mnonstop

11:33 pm - 5:00 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 27mnonstop

$286American Airlines

Wed, Sep 9 - Tue, Sep 22

1:55 pm - 3:30 pmMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

3h 35mnonstop

10:35 am - 5:10 pmPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

4h 35m1 stop Tulsa

$292Southwest

Wed, Sep 9 - Tue, Sep 22

1:30 pm - 5:08 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

5h 38m1 stop Denver Intl

9:45 am - 3:30 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 45mnonstop

$296United Airlines

Wed, Sep 9 - Tue, Oct 6

9:40 am - 2:10 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

6h 30m1 stop Dallas/Fort Worth

12:36 am - 5:59 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 23mnonstop

$296American Airlines

Wed, Sep 9 - Wed, Oct 7

6:40 am - 9:55 amMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

5h 15m1 stop Denver Intl

4:35 pm - 9:50 pmPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

3h 15mnonstop

$296Southwest

Wed, Sep 9 - Tue, Oct 6

6:05 am - 12:23 pmMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

8h 18m1 stop Atlanta Hartsfield-Jackson

12:50 am - 8:44 amPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

5h 54m1 stop Minneapolis St Paul

$306Delta

Sun, Sep 6 - Fri, Sep 11

6:59 am - 1:50 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

8h 51m1 stop Detroit Metropolitan Wayne County

6:20 am - 4:13 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

7h 53m1 stop Detroit Metropolitan Wayne County

$325Delta

Recent direct flight deals from Illinois to Phoenix

Fri, Oct 9 - Sun, Oct 11

4:20 pm - 6:27 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 07mnonstop

7:32 pm - 12:59 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 27mnonstop

$246Frontier

Thu, Oct 8 - Mon, Oct 12

4:20 pm - 6:27 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 07mnonstop

7:32 pm - 12:59 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 27mnonstop

$247Frontier

Sun, Oct 11 - Mon, Oct 12

4:20 pm - 6:27 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 07mnonstop

7:32 pm - 12:59 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 27mnonstop

$247Frontier

Sat, Sep 26 - Sat, Oct 3

8:30 pm - 10:24 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 54mnonstop

11:52 pm - 5:20 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 28mnonstop

$267United Airlines

Tue, Sep 29 - Tue, Oct 6

10:06 am - 12:03 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 57mnonstop

11:52 pm - 5:20 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 28mnonstop

$267United Airlines

Thu, Oct 22 - Mon, Oct 26

8:40 pm - 10:38 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 58mnonstop

11:33 pm - 5:00 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 27mnonstop

$267American Airlines

Wed, Nov 4 - Mon, Nov 9

9:30 pm - 12:24 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 54mnonstop

5:00 am - 9:31 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 31mnonstop

$267American Airlines

Sat, Sep 26 - Sun, Sep 27

5:40 am - 7:15 amMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

3h 35mnonstop

12:35 am - 5:50 amPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

3h 15mnonstop

$267Southwest

Wed, Nov 11 - Fri, Nov 13

5:20 am - 8:10 amMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

3h 50mnonstop

1:35 am - 5:45 amPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

3h 10mnonstop

$267Southwest

Mon, Oct 26 - Sat, Nov 7

8:30 pm - 10:33 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 03mnonstop

3:37 pm - 8:14 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 37mnonstop

$267United Airlines

Useful Info

Low season	July
High season	March
Cheapest flight	$82

Best time to beat the crowds but there is an average 11% increase in price.

Most popular time to fly with an average 8% increase in price.

Flight from St. Louis to Phoenix Sky Harbor Airport

JanieFlew with SWISS-Feb 2025

I think you should prebook food or bring your own food.

Verified travelerFlew with United Airlines-Apr 2024

Use the find my gate feature on the flights phone app if available as the airport is a bit confusing

How does KAYAK find such low prices on flights from Illinois to Phoenix?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Phoenix.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Phoenix?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Phoenix from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to Phoenix?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Phoenix with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Phoenix?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Phoenix from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.