Cheap flights from Phoenix Sky Harbor Intl Airport to Illinois from $110

The cheapest month to fly to Illinois from Phoenix Sky Harbor Intl Airport is in January. Flight prices, which tend to average around $219, 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 $223.

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 $395. Flights from Phoenix Sky Harbor Intl Airport to Illinois on a Sunday will generally be more expensive and average around $560. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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 $375. Flights in the morning are often more expensive with an average ticket price of $458.

Fly from Phoenix Sky Harbor Intl to Chicago O'Hare Intl for the best Phoenix Sky Harbor Intl - Illinois flight prices

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 $306 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 $279 on momondo.

There are 4 cabin classes available to choose from on Phoenix Sky Harbor Intl Airport to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

American Airlines, United Airlines and Southwest 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 43% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

The number of flights available between Phoenix Sky Harbor Intl Airport and Illinois is 53 per day as of November 2026. The most frequent departure time is 11:00AM, with 45% of daily flights leaving at noon.

The number of flights available between Phoenix Sky Harbor Intl Airport and Illinois is 375 per week as of November 2026. The most frequent departure day is Mon, with 18% of weekly flights leaving on this day.