$64 Find Cheap Flights from Denver to Illinois - Compare and Save

The cheapest ticket to Illinois from Denver found in the last 5 days was to Chicago, at $143 round-trip. The most popular route is from Denver (DEN) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 5 days was $143.

The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $252 on average. Morning departures are around 11% 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 $535.

No, with an average price for the route of $362, prices are generally cheapest when you fly direct.

The cheapest month for flights from Denver to Illinois is January, when tickets cost $237 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $335 and $334 respectively.

If you are looking for a flight deal from Denver to Illinois, look for departures on Thursdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Illinois, Wednesday is the cheapest day to fly and Monday is the most expensive.

To get a below average price on the flight from Denver to Illinois, you should book around 4 weeks before departure, which saves you about 41% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

There are 6 airlines that fly nonstop from Denver to Illinois. They are: American Airlines, Frontier, JetBlue, Southwest, United Airlines and Allegiant Air. The cheapest price of all airlines flying this route was found with Frontier at $77 for a round-trip flight to Chicago O'Hare Intl Airport (ORD). On average, Frontier offers the best prices for nonstop flights between Denver and Illinois.

Denver and Illinois are connected by different airlines. The airlines that fly that route the most regularly are United Airlines (99 flights per week), Air Canada (83 flights per week), and Southwest (48 flights per week).

The duration of a flight to Illinois depends on your arrival airport. The shortest routes to Illinois from Denver are to Peoria, which takes 2h 03m, Moline, which takes 2h 16m, and Chicago, which takes 3h 27m.

There are 4 cabin class options for the route. These are First, Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

The earliest flight from Denver to Illinois departs at 6:00 am, landing in Chicago at 9:43 am.

If you prefer to fly at night, the latest flight from Denver to Illinois jets off at 9:05 pm and lands in Chicago at 12:44 am.