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

Frontier, Southwest, and United 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 41% 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 November 2025.

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.

$27 Cheap Flights from Phoenix Sky Harbor Intl Airport to Illinois in 2025/26

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 44 per day as of November 2025. The most frequent departure time is 12:00PM, with 46% 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 308 per week as of November 2025. The most frequent departure day is Tue, with 19% of weekly flights leaving on this day.

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

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

4:12 pm - 12:12 amPHX-ORD

7h 00m1 stop

3:47 pm - 12:31 amORD-PHX

9h 44m1 stop

$134Frontier

Find Deal

Thu, Dec 4 - Sun, Dec 7

6:15 am - 2:04 pmPHX-MDW

6h 49m1 stop

6:15 am - 3:18 pmMDW-PHX

10h 03m1 stop

$134Frontier

Find Deal

Thu, Dec 4 - Sun, Dec 7

7:55 pm - 11:51 pmPHX-STL

2h 56mnonstop

2:37 pm - 5:06 pmSTL-PHX

3h 29mnonstop

$149American Airlines

Find Deal

Tue, Dec 2 - Tue, Dec 9

1:45 pm - 6:18 pmPHX-ORD

3h 33mnonstop

11:15 am - 2:15 pmORD-PHX

4h 00mnonstop

$165United Airlines

Find Deal

Sat, Dec 6 - Wed, Dec 10

7:03 pm - 11:30 pmPHX-ORD

3h 27mnonstop

11:15 am - 2:15 pmORD-PHX

4h 00mnonstop

$171United Airlines

Find Deal

Mon, Nov 24 - Thu, Dec 4

6:30 pm - 10:20 pmPHX-STL

2h 50mnonstop

5:25 am - 7:55 amSTL-PHX

3h 30mnonstop

$174Southwest

Find Deal

Fri, Dec 5 - Sat, Dec 6

9:05 am - 1:30 pmPHX-ORD

3h 25mnonstop

2:15 pm - 10:25 pmORD-PHX

9h 10m1 stop

$175Southwest

Find Deal

Sat, Dec 13 - Tue, Dec 16

9:44 am - 1:51 pmPHX-STL

3h 07mnonstop

7:38 am - 10:09 amSTL-PHX

3h 31mnonstop

$209American Airlines

Find Deal

Thu, Dec 11 - Mon, Dec 15

12:59 am - 9:10 amPHX-STL

7h 11m1 stop

6:00 am - 11:54 amSTL-PHX

6h 54m1 stop

$223Delta

Find Deal

Thu, Dec 11 - Sat, Dec 13

12:59 am - 9:10 amPHX-STL

7h 11m1 stop

6:00 am - 11:54 amSTL-PHX

6h 54m1 stop

$229Delta

Find Deal

Thu, Dec 4 - Mon, Dec 8

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

Dec 4

PHX4:12 pmPhoenix Sky Harbor Intl

7h 00m

1 stop

ORD12:12 amChicago O'Hare Intl

Dec 7

ORD3:47 pmChicago O'Hare Intl

9h 44m

1 stop

PHX12:31 amPhoenix Sky Harbor Intl

$134

Find similar

Frontier

Nov 19

PHX10:06 pmPhoenix Sky Harbor Intl

8h 40m

1 stop

ORD7:46 amChicago O'Hare Intl

Nov 22

ORD6:25 pmChicago O'Hare Intl

6h 48m

1 stop

PHX12:13 amPhoenix Sky Harbor Intl

$136

Find similar

Frontier

Nov 19

PHX10:06 pmPhoenix Sky Harbor Intl

8h 40m

1 stop

ORD7:46 amChicago O'Hare Intl

Nov 23

ORD7:57 pmChicago O'Hare Intl

13h 22m

1 stop

PHX8:19 amPhoenix Sky Harbor Intl

$137

Find similar

United Airlines flights from Phoenix Sky Harbor Intl Airport to Illinois

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

United Airlines

Dec 6

PHX1:45 pmPhoenix Sky Harbor Intl

3h 33m

ORD6:18 pmChicago O'Hare Intl

Dec 10

ORD11:15 amChicago O'Hare Intl

4h 00m

PHX2:15 pmPhoenix Sky Harbor Intl

$165

Find similar

United Airlines

Nov 24

PHX7:03 pmPhoenix Sky Harbor Intl

3h 27m

ORD11:30 pmChicago O'Hare Intl

Dec 4

ORD11:15 amChicago O'Hare Intl

4h 00m

PHX2:15 pmPhoenix Sky Harbor Intl

$171

Find similar

United Airlines

Dec 13

PHX12:24 pmPhoenix Sky Harbor Intl

8h 07m

1 stop

PIA9:31 pmGreater Peoria

Dec 14

PIA5:15 pmGreater Peoria

6h 42m

1 stop

PHX10:57 pmPhoenix Sky Harbor Intl

$260

Find similar

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

Thu 12/4

4:12 pm-12:12 am

1 stop7h 00m

Chicago O'Hare Intl

Sun 12/7

3:47 pm-12:31 am

1 stop9h 44m

$134

PhoenixChicago

PHX - MDW

PHXMDW

Phoenix Sky Harbor Intl

Thu 12/4

6:15 am-2:04 pm

1 stop6h 49m

Chicago Midway

Sun 12/7

6:15 am-3:18 pm

1 stop10h 03m

$134

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 12/2

7:55 pm-11:51 pm

Nonstop2h 56m

Lambert-St Louis

Tue 12/9

2:37 pm-5:06 pm

Nonstop3h 29m

$149

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Sat 12/6

1:45 pm-6:18 pm

Nonstop3h 33m

Chicago O'Hare Intl

Wed 12/10

11:15 am-2:15 pm

Nonstop4h 00m

$165

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Mon 11/24

7:03 pm-11:30 pm

Nonstop3h 27m

Chicago O'Hare Intl

Thu 12/4

11:15 am-2:15 pm

Nonstop4h 00m

$171

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 12/5

6:30 pm-10:20 pm

Nonstop2h 50m

Lambert-St Louis

Sat 12/6

5:25 am-7:55 am

Nonstop3h 30m

$174

PhoenixChicago

PHX - ORD

PHXORD

Phoenix Sky Harbor Intl

Sat 12/13

9:05 am-1:30 pm

Nonstop3h 25m

Chicago O'Hare Intl

Tue 12/16

2:15 pm-10:25 pm

1 stop9h 10m

$175

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 12/11

9:44 am-1:51 pm

Nonstop3h 07m

Lambert-St Louis

Mon 12/15

7:38 am-10:09 am

Nonstop3h 31m

$209

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 12/11

12:59 am-9:10 am

1 stop7h 11m

Lambert-St Louis

Sat 12/13

6:00 am-11:54 am

1 stop6h 54m

$223

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 12/4

12:59 am-9:10 am

1 stop7h 11m

Lambert-St Louis

Mon 12/8

6:00 am-11:54 am

1 stop6h 54m

$229

Flights are sorted by cheapest round-trip flights first.

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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 $216, 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 $218.

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 $351. Flights from Phoenix Sky Harbor Intl Airport to Illinois on a Sunday will generally be more expensive and average around $540. 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 $306. Flights at noon are often more expensive with an average ticket price of $490.

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

Fly from Phoenix Sky Harbor Intl to Chicago O'Hare Intl 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 $285 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 $241 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	$128
Fastest flight time	2h 50m
Direct flights	Every day
Airports in Illinois	1 airport

The best one-way flight to Illinois from Phoenix Sky Harbor Intl Airport in the past 72 hours is $128. The best round-trip flight deal from Phoenix Sky Harbor Intl Airport to Illinois found on momondo in the last 72 hours is $218.

The fastest flight from Phoenix Sky Harbor Intl Airport to Illinois takes 2h 50m

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

There is 1 airport near Illinois: 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 November 2025.
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 Boeing 737-800, making up 17.21% of the total bookings. Other popular models include Airbus A321neo with 14.48%, Boeing 737-900 with 14.17%, and Airbus A321-100/200 with 9.94%.

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
Spirit Airlines	PriceFrom $79	Free Cancellation	Rating 6.3 8,113 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $99	Free Cancellation	Rating 5.8 3,115 reviews	Search Frontier flights
United Airlines	PriceFrom $149	Free Cancellation	Rating 7.4 9,001 reviews	Search United Airlines flights
Delta	PriceFrom $162	Free Cancellation	Rating 7.9 8,004 reviews	Search Delta flights
American Airlines	PriceFrom $197	Free Cancellation	Rating 7.2 11,039 reviews	Search American Airlines flights
Southwest	PriceFrom $205	Free Cancellation	Rating 8.0 4,239 reviews	Search Southwest 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

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Phoenix Sky Harbor Intl Airport flight routes

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Cheap flights from Phoenix Sky Harbor Intl Airport to Illinois from $27

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Big names and deals

Filter for what you want

Filter for what you want

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

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Cheap one-way flights

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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

United Airlines flights from Phoenix Sky Harbor Intl Airport to Illinois

Our best United Airlines 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

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

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 $306. Flights at noon are often more expensive with an average ticket price of $490.

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

Fly from Phoenix Sky Harbor Intl to Chicago O'Hare Intl 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 United 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 44 per day as of November 2025. The most frequent departure time is 12:00PM, with 46% 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 308 per week as of November 2025. The most frequent departure day is Tue, with 19% 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