PHX

$59 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 12/15. 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
$141
Overall average: $337
Frontier
Fri 12/19Sat 12/27
STL - PHX • 1 stop
Cheapest non-stop
$144
Typical prices: $276-$495
Frontier
Mon 12/8Fri 12/12
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

Fri, Dec 19 - Sat, Dec 27
Frontier Logo
10:10 pm - 10:40 amSTL-PHX
13h 30m1 stop
Frontier Logo
10:46 pm - 9:25 pmPHX-STL
21h 39m1 stop
$141Frontier
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Fri, Dec 5 - Sun, Dec 7
Frontier Logo
10:44 pm - 1:47 pmSTL-PHX
16h 03m1 stop
Frontier Logo
4:12 pm - 10:14 amPHX-STL
17h 02m1 stop
$142Frontier
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Sun, Jan 18 - Wed, Jan 21
Multiple Airlines Logo
9:26 pm - 8:20 amMLI-PHX
11h 54m1 stop
Multiple Airlines Logo
4:21 pm - 8:36 pmPHX-MLI
27h 15m1 stop
$230Multiple Airlines
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Sun, Feb 1 - Sun, Feb 8
Multiple Airlines Logo
9:26 pm - 8:20 amMLI-PHX
11h 54m1 stop
Multiple Airlines Logo
9:30 am - 8:36 pmPHX-MLI
10h 06m1 stop
$241Multiple Airlines
Find Deal
Sat, Jan 31 - Sat, Feb 7
United Airlines Logo
1:24 pm - 7:22 pmPIA-PHX
6h 58m1 stop
United Airlines Logo
1:57 pm - 9:39 pmPHX-PIA
6h 42m1 stop
$251United Airlines
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Sat, Jan 31 - Sat, Feb 7
United Airlines Logo
10:45 am - 6:49 pmPIA-PHX
9h 04m2 stops
United Airlines Logo
1:57 pm - 9:39 pmPHX-PIA
6h 42m1 stop
$256United Airlines
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Wed, Dec 24 - Wed, Dec 31
Delta Logo
4:58 pm - 11:53 pmMLI-PHX
7h 55m1 stop
Delta Logo
6:00 am - 4:16 pmPHX-MLI
9h 16m1 stop
$259Delta
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Tue, Feb 10 - Sat, Feb 14
Delta Logo
5:06 pm - 11:46 pmMLI-PHX
7h 40m1 stop
Delta Logo
1:55 pm - 10:32 pmPHX-MLI
7h 37m1 stop
$264Delta
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Tue, Mar 24 - Tue, Mar 31
American Airlines Logo
4:52 pm - 8:58 pmPIA-PHX
6h 06m1 stop
American Airlines Logo
10:50 pm - 10:16 amPHX-PIA
9h 26m1 stop
$269American Airlines
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Thu, Jan 29 - Thu, Feb 5
American Airlines Logo
6:00 am - 2:09 pmSPI-PHX
9h 09m1 stop
American Airlines Logo
3:26 pm - 10:09 pmPHX-SPI
5h 43m1 stop
$397American Airlines
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Good to know

Low seasonAugust
Cheapest flight$59
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 10% 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)