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.

$83 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

Mon, Nov 9 - Fri, Nov 13

7:59 pm - 12:42 amSTL Lambert-St Louis-PHX Phoenix Sky Harbor Intl

5h 43m1 stop Denver Intl

10:09 am - 7:14 pmPHX Phoenix Sky Harbor Intl-STL Lambert-St Louis

8h 05m1 stop Denver Intl

$210Frontier

Sat, Oct 31 - Mon, Nov 2

7:59 pm - 11:42 pmSTL Lambert-St Louis-PHX Phoenix Sky Harbor Intl

5h 43m1 stop Denver Intl

5:01 am - 11:19 amPHX Phoenix Sky Harbor Intl-STL Lambert-St Louis

5h 18m1 stop Dallas/Fort Worth

$235Frontier

Mon, Oct 12 - Thu, Oct 29

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

4h 07mnonstop

3:42 pm - 11:59 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

6h 17m1 stop San Diego

$253Multiple Airlines

Sun, Dec 6 - Thu, Dec 10

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

4h 05mnonstop

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

5h 53m1 stop San Diego

$255Multiple Airlines

Fri, Dec 11 - Sat, Dec 12

9:20 am - 4:00 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

7h 40m1 stop San Diego

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

5h 53m1 stop San Diego

$263Alaska Airlines

Mon, Dec 7 - Fri, Dec 11

6:00 am - 1:49 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

8h 49m1 stop Seattle/Tacoma Intl

9:00 am - 7:55 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

9h 55m1 stop Seattle/Tacoma Intl

$263Alaska Airlines

Mon, Oct 5 - Wed, Oct 7

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

3h 58mnonstop

5:57 pm - 11:30 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 33mnonstop

$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

Wed, Nov 11 - Mon, Nov 16

11:08 am - 2:14 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 06mnonstop

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

3h 37mnonstop

$267United Airlines

Tue, Dec 22 - Tue, Dec 29

6:01 am - 9:04 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 03mnonstop

6:28 pm - 10:59 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 31mnonstop

$267United Airlines

Recent last minute flight deals from Illinois to Phoenix

Sun, Sep 13 - Sat, Oct 17

8:55 pm - 10:47 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

27h 52m1 stop Las Vegas Harry Reid Intl

6:30 pm - 6:34 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

10h 04m1 stop Los Angeles

$273Frontier

Tue, Sep 15 - Sat, Sep 26

6:30 am - 8:00 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

27h 30m1 stop Denver Intl

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

13h 08m1 stop Denver Intl

$288Frontier

Tue, Sep 15 - Tue, Sep 22

1:03 pm - 7:48 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

8h 45m1 stop Seattle/Tacoma Intl

8:39 pm - 5:38 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

6h 59m1 stop Las Vegas Harry Reid Intl

$366Multiple Airlines

Thu, Sep 10 - Sat, Sep 12

6:00 am - 1:06 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

9h 06m1 stop Dallas/Fort Worth

6:38 pm - 6:20 amPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

9h 42m1 stop Seattle/Tacoma Intl

$390Multiple Airlines

Tue, Sep 15 - Sat, Sep 26

6:59 am - 8:54 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 55mnonstop

12:15 pm - 6:03 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 48mnonstop

$392American Airlines

Tue, Sep 15 - Tue, Sep 29

5:05 pm - 6:58 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

3h 53mnonstop

6:50 am - 12:35 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 45mnonstop

$392American Airlines

Sun, Sep 13 - Fri, Oct 16

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

3h 35mnonstop

12:35 am - 5:45 amPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

3h 10mnonstop

$413Southwest

Thu, Sep 10 - Thu, Oct 15

8:10 pm - 9:50 pmMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

3h 40mnonstop

7:55 pm - 1:15 amPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

3h 20mnonstop

$413Southwest

Sun, Sep 13 - Sat, Oct 17

7:00 am - 10:37 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

5h 37m1 stop Denver Intl

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

3h 39mnonstop

$423United Airlines

Tue, Sep 15 - Mon, Sep 21

2:05 pm - 6:33 pmMLI Moline Quad-City-PHX Phoenix Sky Harbor Intl

6h 28m1 stop Chicago O'Hare Intl

2:21 pm - 10:35 pmPHX Phoenix Sky Harbor Intl-MLI Moline Quad-City

6h 14m1 stop Chicago O'Hare Intl

$434United Airlines

Recent direct flight deals from Illinois to Phoenix

Thu, Oct 15 - Sun, Oct 18

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

Fri, Oct 16 - Thu, Oct 22

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

$248Frontier

Thu, Oct 15 - Sun, Oct 18

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

$249Frontier

Mon, Oct 5 - Wed, Oct 7

7:15 pm - 9:00 pmMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

3h 45mnonstop

5:25 pm - 10:45 pmPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

3h 20mnonstop

$267Southwest

Tue, Oct 6 - Tue, Oct 27

5:45 am - 7:30 amMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

3h 45mnonstop

7:00 am - 12:15 pmPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

3h 15mnonstop

$267Southwest

Mon, Oct 5 - Wed, Oct 7

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

3h 58mnonstop

5:57 pm - 11:30 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 33mnonstop

$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

Wed, Nov 11 - Mon, Nov 16

11:08 am - 2:14 pmORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 06mnonstop

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

3h 37mnonstop

$267United Airlines

Tue, Dec 22 - Tue, Dec 29

6:01 am - 9:04 amORD Chicago O'Hare Intl-PHX Phoenix Sky Harbor Intl

4h 03mnonstop

6:28 pm - 10:59 pmPHX Phoenix Sky Harbor Intl-ORD Chicago O'Hare Intl

3h 31mnonstop

$267United Airlines

Tue, Oct 27 - Tue, Oct 27

5:45 am - 7:30 amMDW Chicago Midway-PHX Phoenix Sky Harbor Intl

3h 45mnonstop

12:35 am - 5:45 amPHX Phoenix Sky Harbor Intl-MDW Chicago Midway

3h 10mnonstop

$267Southwest

Useful Info

Low season	July
High season	March
Cheapest flight	$83

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.