Cheap flights from Illinois to Oklahoma from $40

The cheapest month to fly to Oklahoma from Illinois is in October. Flight prices, which tend to average around $315, are often lower during this time because this is during the off-season. If you are unable to visit Oklahoma during the month of October, then departing from Illinois during the month August is also very affordable. Most momondo users find prices during this month for around $345.

The cheapest day to depart from Illinois to Oklahoma is on a Wednesday when prices can be found for as low as $344. Flights from Illinois to Oklahoma on a Monday will generally be more expensive and average around $552. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Flying to Oklahoma from Illinois in the morning is the least expensive time of day to depart. momondo users have found prices as low as $376 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $513 on average. Flights to Oklahoma from Illinois in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Chicago O'Hare Intl to Tulsa for the best Illinois - Oklahoma flight prices

You are more likely to see cheaper flights to Oklahoma from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Oklahoma for around $399 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Oklahoma from Illinois for as low as $237 on momondo.

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

Delta, Frontier, and United Airlines are the most popular carriers operating from Illinois to Oklahoma

American Airlines, United Airlines and Southwest are the top three most popular airlines that fly to Oklahoma from Illinois according to our data. American Airlines is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Oklahoma. Keep in mind that there are 4 different airlines that fly to Oklahoma on a routine basis, so you have a few additional options to choose from.

As of April 2026, 186 flights take off from Illinois and land in Oklahoma each day. The most common flight departure time for this route is 4:00PM, with 43% of daily flights taking off in the afternoon.

As of April 2026, there are 1,307 flights per week flying from Illinois to Oklahoma. The most common day of the week flights depart is Fri, with 16% of flights taking off on this day.