What is the cheapest airline that flies from Phoenix Sky Harbor Intl to Illinois?

Frontier, Southwest, and Alaska Airlines are the most popular carriers operating from Phoenix Sky Harbor Intl to Illinois

What airlines fly to Illinois?

American Airlines, Frontier and United Airlines are the top three most popular airlines that fly to Illinois from Phoenix Sky Harbor Intl Airport according to our data. American Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 6 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

How many operators does momondo search for flights from Phoenix Sky Harbor Intl Airport to Illinois?

The number of operators available for flights from Phoenix Sky Harbor Intl Airport to Illinois is 6 as of February 2026.

How old do you have to be to fly from Phoenix Sky Harbor Intl Airport to Illinois?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix Sky Harbor Intl Airport to Illinois.

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

The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$58 Cheap Flights from Phoenix Sky Harbor Intl Airport to Illinois in 2026

Q: How many flights depart from Phoenix Sky Harbor Intl Airport to Illinois on average per day?

The number of flights available between Phoenix Sky Harbor Intl Airport and Illinois is 40 per day as of February 2026. The most frequent departure time is 8:00AM, with 62% of daily flights leaving at noon.

Q: How many flights depart from Phoenix Sky Harbor Intl Airport to Illinois on average per week?

The number of flights available between Phoenix Sky Harbor Intl Airport and Illinois is 284 per week as of February 2026. The most frequent departure day is Mon, with 21% of weekly flights leaving on this day.

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Find the cheapest flights from Phoenix Sky Harbor Intl Airport to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:12 am - 4:53 pm

PHX

ORD

3h 41mnonstop

7:43 am - 10:02 am

ORD

PHX

4h 19mnonstop

$84Frontier

Fri, Apr 24 - Sun, Apr 26

9:22 am - 2:49 pm

PHX

MDW

3h 27mnonstop

6:15 am - 8:12 am

MDW

PHX

3h 57mnonstop

$84Frontier

Mon, May 4 - Mon, May 11

8:02 pm - 5:31 am

PHX

ORD

7h 29m

1 stop

7:43 am - 10:02 am

ORD

PHX

4h 19mnonstop

$100Multiple Airlines

Wed, Apr 15 - Sun, Apr 19

2:05 pm - 5:31 am

PHX

ORD

13h 26m

1 stop

7:43 am - 10:02 am

ORD

PHX

4h 19mnonstop

$105Multiple Airlines

Wed, Apr 15 - Sun, Apr 19

11:55 pm - 10:26 am

PHX

MLI

8h 31m

1 stop

5:00 pm - 11:02 pm

MLI

PHX

8h 02m

1 stop

$259Delta

Tue, Jun 30 - Tue, Jul 7

11:55 pm - 10:26 am

PHX

MLI

8h 31m

1 stop

5:00 pm - 11:02 pm

MLI

PHX

8h 02m

1 stop

$274Delta

Fri, Jul 3 - Wed, Jul 8

2:31 pm - 11:49 pm

PHX

CMI

7h 18m

1 stop

1:36 pm - 6:10 pm

CMI

PHX

6h 34m

1 stop

$278United Airlines

Tue, May 5 - Sat, May 9

3:50 pm - 11:42 pm

PHX

PAH

5h 52m

1 stop

2:10 pm - 6:06 pm

PAH

PHX

5h 56m

1 stop

$278United Airlines

Wed, Apr 8 - Mon, Apr 13

5:00 am - 5:09 pm

PHX

PIA

10h 09m

1 stop

7:05 pm - 11:59 pm

PIA

PHX

6h 54m

1 stop

$295American Airlines

Tue, Apr 14 - Sun, Apr 19

12:51 am - 9:27 am

PHX

PIA

7h 36m

1 stop

6:27 pm - 12:07 am

PIA

PHX

7h 40m

1 stop

$314American Airlines

Fri, Mar 6 - Sun, Mar 15

Frontier flights from Phoenix Sky Harbor Intl Airport to Illinois

Our best Frontier deals on Phoenix Sky Harbor Intl Airport to Illinois flight tickets

Frontier

Apr 24

PHX11:12 amPhoenix Sky Harbor Intl

3h 41m

ORD4:53 pmChicago O'Hare Intl

Apr 26

ORD7:43 amChicago O'Hare Intl

4h 19m

PHX10:02 amPhoenix Sky Harbor Intl

$84

Frontier

Mar 6

PHX11:24 amPhoenix Sky Harbor Intl

3h 37m

ORD4:01 pmChicago O'Hare Intl

Mar 9

ORD7:00 amChicago O'Hare Intl

4h 14m

PHX9:14 amPhoenix Sky Harbor Intl

$85

Frontier

Apr 30

PHX9:22 amPhoenix Sky Harbor Intl

3h 27m

MDW2:49 pmChicago Midway

May 3

MDW6:15 amChicago Midway

3h 57m

PHX8:12 amPhoenix Sky Harbor Intl

$90

Southwest flights from Phoenix Sky Harbor Intl Airport to Illinois

Our best Southwest deals on Phoenix Sky Harbor Intl Airport to Illinois flight tickets

Southwest

Feb 10

PHX10:35 amPhoenix Sky Harbor Intl

2h 50m

STL2:25 pmLambert-St Louis

Feb 14

STL5:25 pmLambert-St Louis

3h 30m

PHX7:55 pmPhoenix Sky Harbor Intl

$359

Southwest

Feb 10

PHX6:55 amPhoenix Sky Harbor Intl

2h 50m

STL10:45 amLambert-St Louis

Feb 14

STL2:20 pmLambert-St Louis

5h 15m

1 stop

PHX6:35 pmPhoenix Sky Harbor Intl

$364

Southwest

Feb 14

PHX6:55 pmPhoenix Sky Harbor Intl

2h 50m

STL10:45 pmLambert-St Louis

Feb 15

STL2:55 pmLambert-St Louis

3h 30m

PHX5:25 pmPhoenix Sky Harbor Intl

$384

momondo Fare Finder

Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Fri 4/24

11:12 am-4:53 pm

Nonstop3h 41m

Chicago O'Hare Intl

Sun 4/26

7:43 am-10:02 am

Nonstop4h 19m

$84

PhoenixChicago

PHX - MDW

PHXMDW

Phoenix Sky Harbor Intl

Mon 5/4

9:22 am-2:49 pm

Nonstop3h 27m

Chicago Midway

Mon 5/11

6:15 am-8:12 am

Nonstop3h 57m

$84

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Wed 4/15

8:02 pm-5:31 am

1 stop7h 29m

Chicago O'Hare Intl

Sun 4/19

7:43 am-10:02 am

Nonstop4h 19m

$100

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Wed 4/15

2:05 pm-5:31 am

1 stop13h 26m

Chicago O'Hare Intl

Sun 4/19

7:43 am-10:02 am

Nonstop4h 19m

$105

PhoenixMoline

PHX - MLI

PHXMLI

Phoenix Sky Harbor Intl

Tue 6/30

11:55 pm-10:26 am

1 stop8h 31m

Moline Quad-City

Tue 7/7

5:00 pm-11:02 pm

1 stop8h 02m

$259

PhoenixMoline

PHX - MLI

PHXMLI

Phoenix Sky Harbor Intl

Fri 7/3

11:55 pm-10:26 am

1 stop8h 31m

Moline Quad-City

Wed 7/8

5:00 pm-11:02 pm

1 stop8h 02m

$274

PhoenixChampaign

PHX - CMI

PHXCMI

Phoenix Sky Harbor Intl

Tue 5/5

2:31 pm-11:49 pm

1 stop7h 18m

Champaign University-Willard

Sat 5/9

1:36 pm-6:10 pm

1 stop6h 34m

$278

PhoenixPaducah

PHX - PAH

PHXPAH

Phoenix Sky Harbor Intl

Wed 4/8

3:50 pm-11:42 pm

1 stop5h 52m

Paducah Barkley Regional

Mon 4/13

2:10 pm-6:06 pm

1 stop5h 56m

$278

PhoenixPeoria

PHX - PIA

PHXPIA

Phoenix Sky Harbor Intl

Tue 4/14

5:00 am-5:09 pm

1 stop10h 09m

Greater Peoria

Sun 4/19

7:05 pm-11:59 pm

1 stop6h 54m

$295

PhoenixPeoria

PHX - PIA

PHXPIA

Phoenix Sky Harbor Intl

Fri 3/6

12:51 am-9:27 am

1 stop7h 36m

Greater Peoria

Sun 3/15

6:27 pm-12:07 am

1 stop7h 40m

$314

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 Phoenix Sky Harbor Intl Airport 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 Phoenix Sky Harbor Intl Airport is in February. Flight prices, which tend to average around $200, 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 February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $208.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Phoenix Sky Harbor Intl Airport to Illinois is on a Thursday when prices can be found for as low as $341. Flights from Phoenix Sky Harbor Intl Airport to Illinois on a Sunday will generally be more expensive and average around $515. 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 Phoenix Sky Harbor Intl Airport to Illinois during this time can be as low as $302. Flights in the morning are often more expensive with an average ticket price of $439.

What is the cheapest Phoenix Sky Harbor Intl to Illinois flight route?

Fly from Phoenix Sky Harbor Intl to Chicago Midway for the best Phoenix Sky Harbor Intl - 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 Phoenix Sky Harbor Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $273 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Phoenix Sky Harbor Intl Airport for as low as $224 on momondo.

What cabin class options are available on Phoenix Sky Harbor Intl to Illinois flights?

There are 4 cabin classes available to choose from on Phoenix Sky Harbor Intl 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 Phoenix Sky Harbor Intl Airport to Illinois flights?

No. A direct flight is the cheapest option for a flight between Phoenix Sky Harbor Intl Airport to Illinois.

Cheap Phoenix Sky Harbor Intl Airport to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Phoenix Sky Harbor Intl Airport to Illinois

Best Price Found	$138
Fastest flight time	2h 45m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Phoenix Sky Harbor Intl Airport in the past 72 hours is $138. The best round-trip flight deal from Phoenix Sky Harbor Intl Airport to Illinois found on momondo in the last 72 hours is $230.

The fastest flight from Phoenix Sky Harbor Intl Airport to Illinois takes 2h 45m

Direct flights go from Phoenix Sky Harbor Intl Airport to Illinois every day.

There are 98 airports in Illinois. From Phoenix Sky Harbor Intl Airport there are direct flights to Lambert-St Louis (STL).

Search flight deals

When did momondo last update prices for flights from Phoenix Sky Harbor Intl Airport to Illinois?
Prices for flights from Phoenix Sky Harbor Intl Airport to Illinois refresh daily.
How many operators does momondo search for flights from Phoenix Sky Harbor Intl Airport to Illinois?
The number of operators available for flights from Phoenix Sky Harbor Intl Airport to Illinois is 6 as of February 2026.
How old do you have to be to fly from Phoenix Sky Harbor Intl Airport to Illinois?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix Sky Harbor Intl Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Phoenix Sky Harbor Intl Airport to Illinois?
Based on momondo bookings for flights between Phoenix Sky Harbor Intl Airport and Illinois, the leading plane model is Airbus A321neo, making up 17.91% of the total bookings. Other popular models include Boeing 737-800 with 14.56%, Airbus A321-100/200 with 13.56%, and Boeing 737-900 with 10.92%.

Best airlines flying from Phoenix Sky Harbor Intl Airport to Illinois

Compare and see reviews for airlines that fly from Phoenix Sky Harbor Intl Airport to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $65	Free Cancellation	Rating 5.7 3,052 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $79	Free Cancellation	Rating 6.3 8,437 reviews	Search Spirit Airlines flights
Delta	PriceFrom $118	Free Cancellation	Rating 7.9 8,178 reviews	Search Delta flights
United Airlines	PriceFrom $149	Free Cancellation	Rating 7.4 9,267 reviews	Search United Airlines flights
Southwest	PriceFrom $187	Free Cancellation	Rating 8.0 4,282 reviews	Search Southwest flights
American Airlines	PriceFrom $198	Free Cancellation	Rating 7.2 11,259 reviews	Search American Airlines flights

Why use momondo?

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

It is quick and easy to find Phoenix to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

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

Yes. momondo enables you to select and highlight flights to Illinois from Phoenix with this policy.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Phoenix.

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

Of course. momondo tracks the price of Phoenix to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Illinois trip

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Popular cities in Illinois

Flights to New Yorkfrom $49

Flights to Los Angelesfrom $49

Flights to Miamifrom $36

Flights to Chicagofrom $50

Flights to Orlandofrom $27

Flights to San Franciscofrom $51

Flights to Las Vegasfrom $28

Flights to Washington, D.C.from $51

Flights to Bostonfrom $50

Flights to Atlantafrom $49

Flights to Dallasfrom $50

Flights to Seattlefrom $65

Cheap flights from Phoenix Sky Harbor Intl Airport to Illinois from $61

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Find the cheapest flights from Phoenix Sky Harbor Intl Airport to Illinois

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Frontier flights from Phoenix Sky Harbor Intl Airport to Illinois

Our best Frontier deals on Phoenix Sky Harbor Intl Airport to Illinois flight tickets

Southwest flights from Phoenix Sky Harbor Intl Airport to Illinois

Our best Southwest deals on Phoenix Sky Harbor Intl Airport to Illinois flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to Illinois that are best for you.

See travel insights to Illinois from

How to get the cheapest flight ticket from Phoenix Sky Harbor Intl Airport to Illinois

What is the cheapest month to fly to Illinois?

What is the cheapest day to depart on your flight to Illinois?

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 Phoenix Sky Harbor Intl Airport to Illinois during this time can be as low as $302. Flights in the morning are often more expensive with an average ticket price of $439.

What is the cheapest Phoenix Sky Harbor Intl to Illinois flight route?

Fly from Phoenix Sky Harbor Intl to Chicago Midway for the best Phoenix Sky Harbor Intl - Illinois flight prices

How far in advance should I book a flight to Illinois?

What cabin class options are available on Phoenix Sky Harbor Intl to Illinois flights?

There are 4 cabin classes available to choose from on Phoenix Sky Harbor Intl 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 Phoenix Sky Harbor Intl Airport to Illinois flights?

No. A direct flight is the cheapest option for a flight between Phoenix Sky Harbor Intl Airport to Illinois.

What is the cheapest airline that flies from Phoenix Sky Harbor Intl to Illinois?

Frontier, Southwest, and Alaska Airlines are the most popular carriers operating from Phoenix Sky Harbor Intl to Illinois

What airlines fly to Illinois?

How many flights depart from Phoenix Sky Harbor Intl Airport to Illinois on average per day?

The number of flights available between Phoenix Sky Harbor Intl Airport and Illinois is 40 per day as of February 2026. The most frequent departure time is 8:00AM, with 62% of daily flights leaving at noon.

How many flights depart from Phoenix Sky Harbor Intl Airport to Illinois on average per week?

The number of flights available between Phoenix Sky Harbor Intl Airport and Illinois is 284 per week as of February 2026. The most frequent departure day is Mon, with 21% of weekly flights leaving on this day.

Cheap Phoenix Sky Harbor Intl Airport to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Phoenix Sky Harbor Intl Airport to Illinois

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

When did momondo last update prices for flights from Phoenix Sky Harbor Intl Airport to Illinois?

How many operators does momondo search for flights from Phoenix Sky Harbor Intl Airport to Illinois?

How old do you have to be to fly from Phoenix Sky Harbor Intl Airport to Illinois?

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

What is the most popular plane model from Phoenix Sky Harbor Intl Airport to Illinois?

Best airlines flying from Phoenix Sky Harbor Intl Airport to Illinois

Compare and see reviews for airlines that fly from Phoenix Sky Harbor Intl Airport to Illinois with momondo

Why use momondo?

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

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

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

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

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Illinois

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo

Phoenix Sky Harbor Intl Airport flight routes

According to popular flight searches on momondo this year

Illinois flight routes

According to popular flight searches on momondo this year

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