PHX

$37 Find Cheap Flights from Illinois to Phoenix

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Phoenix departing on 1/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Phoenix Sky Harbor Intl Airport

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Everything you should know

Cheapest round-trip
$159
Overall average: $328
Frontier
Sat 11/15Fri 11/21
STL - PHX • 1 stop
Cheapest non-stop
$160
Typical prices: $341-$481
Frontier
Sun 1/25Sun 2/1
STL - PHX • Non-stop
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We hope you love your trip to Phoenix!
Flight Deals
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Flight Deals

Cheap Flights from Illinois to Phoenix

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to Phoenix that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Illinois to Phoenix

Sat, Nov 15 - Fri, Nov 21
Frontier Logo
4:51 pm - 11:29 pmSTL-PHX
7h 38m1 stop
Frontier Logo
11:14 am - 3:08 pmPHX-STL
2h 54mnonstop
$159Frontier
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Sun, Jan 25 - Sun, Feb 1
Frontier Logo
8:36 pm - 11:07 pmSTL-PHX
3h 31mnonstop
Frontier Logo
3:44 pm - 7:41 pmPHX-STL
2h 57mnonstop
$160Frontier
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Mon, Jan 5 - Thu, Jan 8
Southwest Logo
9:50 pm - 12:35 amMDW-PHX
3h 45mnonstop
Southwest Logo
6:35 pm - 10:50 pmPHX-MDW
3h 15mnonstop
$165Southwest
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Wed, Dec 17 - Sun, Jan 4
American Airlines Logo
5:00 am - 7:50 amORD-PHX
3h 50mnonstop
American Airlines Logo
12:58 am - 5:34 amPHX-ORD
3h 36mnonstop
$165American Airlines
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Sat, Dec 13 - Wed, Dec 17
Southwest Logo
7:30 pm - 10:20 pmMDW-PHX
3h 50mnonstop
Southwest Logo
12:55 pm - 7:20 pmPHX-MDW
5h 25m1 stop
$171Southwest
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Sat, Feb 14 - Sat, Feb 21
United Airlines Logo
4:10 pm - 7:18 pmORD-PHX
4h 08mnonstop
United Airlines Logo
6:31 pm - 10:59 pmPHX-ORD
3h 28mnonstop
$177United Airlines
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Wed, Feb 25 - Mon, Mar 2
American Airlines Logo
5:00 am - 8:03 amORD-PHX
4h 03mnonstop
American Airlines Logo
12:59 am - 5:19 amPHX-ORD
3h 20mnonstop
$179American Airlines
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Sat, Dec 13 - Wed, Dec 17
United Airlines Logo
9:25 am - 12:32 pmORD-PHX
4h 07mnonstop
United Airlines Logo
3:38 pm - 8:07 pmPHX-ORD
3h 29mnonstop
$182United Airlines
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Wed, Dec 3 - Sun, Dec 7
Alaska Airlines Logo
8:55 am - 3:13 pmORD-PHX
7h 18m1 stop
Alaska Airlines Logo
6:02 am - 2:09 pmPHX-ORD
7h 07m1 stop
$185Alaska Airlines
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Thu, Jan 8 - Wed, Jan 14
Alaska Airlines Logo
9:00 am - 3:03 pmORD-PHX
7h 03m1 stop
Alaska Airlines Logo
3:45 pm - 11:37 pmPHX-ORD
6h 52m1 stop
$193Alaska Airlines
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Good to know

Low seasonAugust
Cheapest flight$37
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly with an average 11% increase in price.
Flight from St. Louis to Phoenix

Flights from Illinois to Phoenix: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Illinois to Phoenix 
Learn how KAYAK collects reviews and tips from users.
JanieFlew with SWISSORD-PHXFeb 2025
I think you should prebook food or bring your own food.
Verified travelerFlew with United AirlinesORD-PHXApr 2024
Use the find my gate feature on the flights phone app if available as the airport is a bit confusing

FAQs for booking Illinois to Phoenix flights

  • 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.

Traveling to a place near Phoenix?

Book flights to Phoenix if you plan to visit one of these locations
Paradise Valley
Globe
Cave Creek
Guadalupe
Morristown

Everything you need to know for your flight to Phoenix

Information on your arrival and departure airports

Phoenix (PHX)