What airlines fly to Illinois?

American Airlines, Frontier and United Airlines are the top three most popular airlines that fly to Illinois from Arizona according to our data. American Airlines is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 7 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Arizona to Illinois?

Frontier, Southwest, and Allegiant Air are the most popular carriers operating from Arizona to Illinois

How long is the flight from Arizona to Illinois?

The flight from Arizona to Illinois depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from Phoenix (a popular airport in Arizona) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 3h 25m on average. If you fly from Tucson (another popular airport in Arizona) to Chicago O'Hare Intl Airport, then the average flight time is 3h 28m.

How many flights depart from Arizona to Illinois on average per day?

As of December 2025, 45 flights take off from Arizona and land in Illinois each day. The most common flight departure time for this route is 1:00PM, with 47% of daily flights taking off at noon.

How many flights depart from Arizona to Illinois on average per week?

As of December 2025, there are 319 flights per week flying from Arizona to Illinois. The most common day of the week flights depart is Tue, with 36% of flights taking off on this day.

When did momondo last update prices for flights from Arizona to Illinois?

Prices for flights from Arizona to Illinois refresh daily.

How many operators does momondo search for flights from Arizona to Illinois?

As of December 2025, there are 7 operators available to choose from for flights from Arizona to Illinois.

How old do you have to be to fly from Arizona to Illinois?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Arizona to Illinois.

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

The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$64 Cheap Flights from Arizona to Illinois in 2025/26

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Find the cheapest flights from Arizona to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:32 pm - 8:48 pm

LAS

STL

3h 16mnonstop

9:45 pm - 11:44 pm

STL

LAS

3h 59mnonstop

$80Frontier

Fri, Feb 6 - Mon, Feb 9

7:00 am - 12:12 pm

LAS

STL

3h 12mnonstop

1:35 pm - 3:30 pm

STL

LAS

3h 55mnonstop

$88Frontier

Mon, Jan 12 - Mon, Jan 19

2:15 pm - 6:58 pm

PHX

ORD

3h 43mnonstop

8:08 pm - 11:10 pm

ORD

PHX

4h 02mnonstop

$94Frontier

Fri, Jan 9 - Mon, Jan 12

1:21 pm - 5:26 pm

AZA

RFD

3h 05mnonstop

6:16 pm - 9:00 pm

RFD

AZA

3h 44mnonstop

$106Allegiant Air

Fri, Jan 23 - Mon, Jan 26

1:21 pm - 5:26 pm

AZA

RFD

3h 05mnonstop

2:05 pm - 4:49 pm

RFD

AZA

3h 44mnonstop

$143Allegiant Air

Fri, Jan 16 - Wed, Jan 21

4:02 pm - 11:50 pm

TUS

STL

6h 48m1 stop

9:32 am - 3:56 pm

STL

TUS

7h 24m1 stop

$243American Airlines

Sat, Feb 14 - Wed, Feb 18

2:32 pm - 8:58 pm

TUS

STL

5h 26m1 stop

4:30 pm - 9:31 pm

STL

TUS

6h 01m1 stop

$265United Airlines

Sat, Feb 7 - Sat, Feb 14

2:50 pm - 10:59 pm

TUS

STL

7h 09m2 stops

11:46 am - 6:40 pm

STL

TUS

7h 54m1 stop

$281American Airlines

Sat, Feb 7 - Sat, Feb 14

7:20 am - 4:35 pm

TUS

STL

8h 15m2 stops

6:05 am - 11:15 am

STL

TUS

6h 10m1 stop

$292Southwest

Tue, Feb 3 - Wed, Feb 11

3:45 pm - 10:05 pm

TUS

STL

5h 20m1 stop

8:45 am - 2:55 pm

STL

TUS

7h 10m2 stops

$302Southwest

Wed, Feb 18 - Sat, Feb 21

Frontier flights from Arizona to Illinois

Our best Frontier deals on Arizona to Illinois flight tickets

Frontier

Feb 6

LAS3:32 pmLas Vegas Harry Reid Intl

3h 16m

STL8:48 pmLambert-St Louis

Feb 9

STL9:45 pmLambert-St Louis

3h 59m

LAS11:44 pmLas Vegas Harry Reid Intl

$80

Find similar

Frontier

Jan 12

LAS7:00 amLas Vegas Harry Reid Intl

3h 12m

STL12:12 pmLambert-St Louis

Jan 19

STL1:35 pmLambert-St Louis

3h 55m

LAS3:30 pmLas Vegas Harry Reid Intl

$88

Find similar

Frontier

Jan 17

PHX8:11 pmPhoenix Sky Harbor Intl

16h 09m

1 stop

ORD1:20 pmChicago O'Hare Intl

Jan 24

ORD8:00 amChicago O'Hare Intl

4h 11m

PHX11:11 amPhoenix Sky Harbor Intl

$97

Find similar

Spirit Airlines flights from Arizona to Illinois

Our best Spirit Airlines deals on Arizona to Illinois flight tickets

Spirit Airlines

May 14

LAS11:59 pmLas Vegas Harry Reid Intl

3h 32m

ORD5:31 amChicago O'Hare Intl

May 19

ORD8:53 pmChicago O'Hare Intl

4h 01m

LAS10:54 pmLas Vegas Harry Reid Intl

$111

Find similar

Spirit Airlines

May 15

LAS11:59 pmLas Vegas Harry Reid Intl

3h 32m

ORD5:31 amChicago O'Hare Intl

May 19

ORD8:53 pmChicago O'Hare Intl

4h 01m

LAS10:54 pmLas Vegas Harry Reid Intl

$136

Find similar

Spirit Airlines

May 14

LAS11:59 pmLas Vegas Harry Reid Intl

3h 32m

ORD5:31 amChicago O'Hare Intl

May 19

ORD7:41 amChicago O'Hare Intl

7h 23m

1 stop

LAS1:04 pmLas Vegas Harry Reid Intl

$149

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Las VegasSt. Louis

LAS - STL

LASSTL

Las Vegas Harry Reid Intl

Fri 2/6

3:32 pm-8:48 pm

Nonstop3h 16m

Lambert-St Louis

Mon 2/9

9:45 pm-11:44 pm

Nonstop3h 59m

$80

Las VegasSt. Louis

LAS - STL

LASSTL

Las Vegas Harry Reid Intl

Mon 1/12

7:00 am-12:12 pm

Nonstop3h 12m

Lambert-St Louis

Mon 1/19

1:35 pm-3:30 pm

Nonstop3h 55m

$88

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Fri 1/9

2:15 pm-6:58 pm

Nonstop3h 43m

Chicago O'Hare Intl

Mon 1/12

8:08 pm-11:10 pm

Nonstop4h 02m

$94

PhoenixChicago

AZA - RFD

AZARFD

Phoenix-Mesa Gateway

Fri 1/23

1:21 pm-5:26 pm

Nonstop3h 05m

Chicago Greater Rockford

Mon 1/26

6:16 pm-9:00 pm

Nonstop3h 44m

$106

PhoenixChicago

AZA - RFD

AZARFD

Phoenix-Mesa Gateway

Fri 1/16

1:21 pm-5:26 pm

Nonstop3h 05m

Chicago Greater Rockford

Wed 1/21

2:05 pm-4:49 pm

Nonstop3h 44m

$143

TucsonSt. Louis

TUS - STL

TUSSTL

Tucson

Sat 2/14

4:02 pm-11:50 pm

1 stop6h 48m

Lambert-St Louis

Wed 2/18

9:32 am-3:56 pm

1 stop7h 24m

$243

TucsonSt. Louis

TUS - STL

TUSSTL

Tucson

Sat 2/7

2:32 pm-8:58 pm

1 stop5h 26m

Lambert-St Louis

Sat 2/14

4:30 pm-9:31 pm

1 stop6h 01m

$265

TucsonSt. Louis

TUS - STL

TUSSTL

Tucson

Sat 2/7

2:50 pm-10:59 pm

2 stops7h 09m

Lambert-St Louis

Sat 2/14

11:46 am-6:40 pm

1 stop7h 54m

$281

TucsonSt. Louis

TUS - STL

TUSSTL

Tucson

Tue 2/3

7:20 am-4:35 pm

2 stops8h 15m

Lambert-St Louis

Wed 2/11

6:05 am-11:15 am

1 stop6h 10m

$292

TucsonSt. Louis

TUS - STL

TUSSTL

Tucson

Wed 2/18

3:45 pm-10:05 pm

1 stop5h 20m

Lambert-St Louis

Sat 2/21

8:45 am-2:55 pm

2 stops7h 10m

$302

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Arizona 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

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Arizona 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 Arizona to Illinois is on a Thursday when prices can be found for as low as $346. Flights from Arizona to Illinois on a Sunday will generally be more expensive and average around $542. 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 Arizona to Illinois during this time can be as low as $302. Flights at noon are often more expensive with an average ticket price of $464.

What is the cheapest Arizona to Illinois flight route?

Fly from Phoenix Sky Harbor Intl to Chicago O'Hare Intl for the best Arizona - 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 Arizona when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $278 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Arizona for as low as $239 on momondo.

What cabin class options are available on Arizona to Illinois flights?

There are 4 cabin classes available to choose from on Arizona 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 Arizona to Illinois flights?

No. A direct flight is the cheapest option for a flight between Arizona to Illinois.

Cheap Arizona to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Arizona to Illinois

Best Price Found	$107
Fastest flight time	2h 50m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Arizona in the past 72 hours is $107. The best round-trip flight deal from Arizona to Illinois found on momondo in the last 72 hours is $226.

The fastest flight from Arizona to Illinois takes 2h 50m

Direct flights go from Arizona to Illinois every day.

There are 98 airports in Illinois. From Arizona there are direct flights to Chicago Greater Rockford (RFD), Chicago Midway (MDW), Lambert-St Louis (STL).

Search flight deals

When did momondo last update prices for flights from Arizona to Illinois?
Prices for flights from Arizona to Illinois refresh daily.
How many operators does momondo search for flights from Arizona to Illinois?
As of December 2025, there are 7 operators available to choose from for flights from Arizona to Illinois.
How old do you have to be to fly from Arizona to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Arizona to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Arizona to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Arizona to Illinois is Boeing 737-800 (17.62% of total bookings). The next most popular plane models are Airbus A321neo (16.86%), Boeing 737-900 (13.77%), and Airbus A321-100/200 (10.11%).

Best airlines flying from Arizona to Illinois

Compare and see reviews for airlines that fly from Arizona to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Spirit Airlines	PriceFrom $79	Free Cancellation	Rating 6.3 8,188 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $81	Free Cancellation	Rating 5.8 3,082 reviews	Search Frontier flights
Allegiant Air	PriceFrom $106	Free Cancellation	Rating 7.2 700 reviews	Search Allegiant Air flights
United Airlines	PriceFrom $149	Free Cancellation	Rating 7.4 9,094 reviews	Search United Airlines flights
Delta	PriceFrom $162	Free Cancellation	Rating 7.9 8,009 reviews	Search Delta flights
Southwest	PriceFrom $182	Free Cancellation	Rating 7.9 4,250 reviews	Search Southwest flights
American Airlines	PriceFrom $198	Free Cancellation	Rating 7.2 11,047 reviews	Search American Airlines flights

Why use momondo?

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

Finding the right flight to Illinois from Arizona is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Illinois quick and easy, saving you time and money.

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

Flights from Arizona to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Arizona to Illinois.

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

If you are not ready to book a flight from Arizona to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.