$89 Find Cheap Flights from Pennsylvania to Illinois - Compare and Save

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Pennsylvania to Illinois.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Pennsylvania to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Pennsylvania to Illinois with an airline and back with another airline.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Pennsylvania to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Pennsylvania and Illinois are connected by different airlines. The airlines that fly that route the most regularly are American Airlines (258 flights per week), United Airlines (214 flights per week), and Alaska Airlines (161 flights per week).

There are 12 airports in Illinois. The busiest airport is Chicago O'Hare Airport (ORD), with 91% of all flights arriving there.

Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in Illinois is Chicago Midway Airport (MDW), with an average flight price of $260.

Based on KAYAK data, the cheapest day to fly to Illinois is Friday where round-trip tickets can be as cheap as $349. On the other hand, the most expensive day to fly is Sunday, where round-trip prices are $497 on average.

The cheapest time of day to fly to Illinois is generally in the evening, when round-trip flights cost $344 on average. Morning departures are around 19% more expensive than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $416.

The cheapest ticket to Illinois from Pennsylvania found in the last 5 days was to Chicago O'Hare Intl Airport, at $132 round-trip. The most popular route is Allentown (ABE) to Chicago O'Hare Intl Airport (ORD) and the cheapest round-trip airline ticket found on this route in the last 5 days was $132.

The cheapest month for flights from Pennsylvania to Illinois is October, when tickets cost $149 (return) on average. On the other hand, the most expensive months are January and February, when the average cost of round-trip tickets is $243 and $234 respectively.

To get a below average price on the flight from Pennsylvania to Illinois, you should book around 3 weeks before departure, which saves you about 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

From Pennsylvania, there are direct flights to Illinois from 9 cities. The city with the most direct flights is Philadelphia, with 579 direct flights each week.

There are around 218 direct flights from within Pennsylvania to Illinois every day. Most flights (50%) depart in the morning.

Each week there are around 1,525 direct flights from within Pennsylvania to Illinois. The most common day for departures is Sunday, with 17% of flights taking off on this day.

An average nonstop flight from Pennsylvania to Illinois takes 4h 11m, covering a distance of 693 miles. The shortest route is Pittsburgh (PIT) to Chicago Midway Airport (MDW) with an average flight time of 1h 20m.

There are not any long-haul (6-12 hour flight duration) or medium-haul (3-6 hour flight duration) flights to Illinois. Instead, there are 1,525 short-haul flights (up to 3 hour flight duration), with the most arriving from Philadelphia.

Based on KAYAK flight searches, the most popular destination is Chicago (92% of total searches to Illinois). The next most popular destinations are St. Louis (7%) and Moline (0%). Searches for flights to Peoria (0%), to Evansville (0%) and to Bloomington (0%) are also popular.