Cheap flights from Illinois to Orange County from $145

The cheapest month to fly to Orange County from Illinois is in December. Flight prices, which tend to average around $70, are often lower during this time because this is during the off-season. If you aren’t able to travel to Orange County during the month of December, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $84.

On average, the least expensive day to fly to Orange County from Illinois is on a Thursday. momondo users have found tickets for Thursday departures for as low as $341. However, this price may fluctuate depending on the airline, the season, and holidays. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $456. These prices are subject to change though, so be sure to set up a Price Alert for flights to Orange County.

According to our data, the cheapest time of day to fly to Orange County is in the evening. momondo users have found flights departing from Illinois to Orange County in the evening for as low as $317. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $785 on average. Flights to Orange County from Illinois in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Chicago O'Hare Intl to Santa Ana J. Wayne/Orange Cnty for the best Illinois - Orange County flight prices

You are more likely to see cheaper flights to Orange County from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Orange County for around $295 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Orange County from Illinois for as low as $247 on momondo.

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

Frontier, Alaska Airlines, and United Airlines are the most popular carriers operating from Illinois to Orange County

American Airlines, United Airlines and Alaska Airlines are the top three most popular airlines that fly to Orange County from Illinois according to our data. American Airlines is the first choice among our users, with 71% of people opting to fly with this airline when traveling to Orange County. Keep in mind that there are 7 different airlines that fly to Orange County on a routine basis, so you have a few additional options to choose from.

As of May 2026, there are 19 flights per day flying from Illinois to Orange County. The most common time of day flights depart is 6:00PM, with 40% of flights taking off at noon.

133 flights are operational weekly from Illinois to Orange County as of May 2026. The most popular departure day for this route is Fri, with 19% of flights per week taking off on this day.