Cheap flights from Illinois to Pennsylvania from $45

The month of October is, on average, the cheapest month to fly to Pennsylvania from Illinois, with most prices found around $188. If you don’t want to visit Pennsylvania in October, then you should wait until January to fly from Illinois, when ticket prices are also cheap, with an average price of $200.

The cheapest day to depart on your flight to Pennsylvania is on a Friday when prices can be found for as low as $270. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $391. These prices are subject to change though, so be sure to set up a Price Alert for flights to Pennsylvania.

Our most recent data shows that the best time of day to fly to Pennsylvania is in the evening. Flights from Illinois to Pennsylvania during this time can be as low as $253. In contrast, the most expensive time of day to depart to Pennsylvania is in the afternoon when prices are around $396.

Fly from Chicago O'Hare Intl to Pittsburgh for the best Illinois - Pennsylvania flight prices

You are more likely to see cheaper flights to Pennsylvania from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Pennsylvania for around $277 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Pennsylvania from Illinois for as low as $212 on momondo.

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

Spirit Airlines, Delta, and United Airlines are the most popular carriers operating from Illinois to Pennsylvania

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Pennsylvania from Illinois 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 Pennsylvania. Keep in mind that there are 5 different airlines that fly to Pennsylvania on a routine basis, so you have a few additional options to choose from.

As of March 2026, 259 flights take off from Illinois and land in Pennsylvania each day. The most common flight departure time for this route is 6:00PM, with 44% of daily flights taking off in the afternoon.

As of March 2026, there are 1,815 flights per week flying from Illinois to Pennsylvania. The most common day of the week flights depart is Mon, with 20% of flights taking off on this day.