Cheap flights from Allentown to Chicago from $123

The month of October is, on average, the cheapest month to fly to Chicago from Allentown, with most prices found around $298. If you’re not able to fly to Chicago in October, then December is your next best option. Flight prices from Allentown to Chicago during December average around $312.

The cheapest day to depart on your flight to Chicago is on a Wednesday when prices can be found for as low as $290. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Allentown to Chicago for around $364.

Our most recent data shows that the best time of day to fly to Chicago is in the evening. Flights from Allentown to Chicago during this time can be as low as $268. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $362.

Fly from Allentown-Bethlehem to Chicago O'Hare Intl for the best Allentown-Bethlehem - Chicago flight prices

You are more likely to see cheaper flights to Chicago from Allentown when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $419 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from Allentown for as low as $301 on momondo.

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

You could potentially save up to 59% on your flight if you consider stops on a Allentown to Chicago flight.

United Airlines and Delta are the most popular carriers operating from Allentown-Bethlehem to Chicago

United Airlines, American Airlines and Frontier are the top three most popular airlines that fly to Chicago from Allentown according to our data. United Airlines is the first choice among our users, with 47% of people opting to fly with this airline when traveling to Chicago. Keep in mind that there are 6 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.

Philadelphia (PHL) was the most common stop: 80% of momondo users choosing 1-stop flights on this route connected there.

Flights via Philadelphia (PHL) offer the lowest average round-trip price of $196.

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 3h 47m.

Detroit (DTW) has the shortest average layover time for this route: 1h 04m.

5 flights are operational daily from Allentown to Chicago as of March 2026. The most popular departure time for this route is 6:00AM, with 65% of flights per day taking off at noon.

The number of flights available between Allentown and Chicago is 40 per week as of March 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.