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$72+ Cheap flights from Orange County to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
SNA — ORD
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from Orange County to Illinois

Keep the following information in mind while searching for Orange County to Illinois flight deals. Data was last updated September 16, 2025.

Round-trip from

$144
(Frontier)

One-way from

$72
(Cheapflightsfares)

Popular in

December

Cheapest in

February

Average price

$279
From Orange County to Illinois
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One-way flight from Orange County to Illinois
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Highest demand for flights based on searches. 9% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Orange County to Illinois

Cheapest flights from Orange County to Illinois
Explore the most affordable flight options available from Orange County to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/242:35 pmSNA - STL
1 stop5h 39mFrontier
Mon 10/2712:38 pmSTL - SNA
1 stop8h 30mFrontier
Deal found 9/14$144
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1412:01 pmSNA - STL
1 stop19h 06mFrontier
Mon 11/177:45 pmSTL - SNA
1 stop19h 50mFrontier
Deal found 9/16$156
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/135:46 pmSNA - STL
1 stop18h 11mMultiple Airlines
Mon 11/172:42 pmSTL - SNA
1 stop8h 17mMultiple Airlines
Deal found 9/15$158
This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/102:35 pmSNA - STL
1 stop5h 39mFrontier
Mon 10/1312:38 pmSTL - SNA
1 stop8h 30mFrontier
Deal found 9/14$188
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/42:20 pmSNA - STL
1 stop16h 47mFrontier
Wed 11/57:45 pmSTL - SNA
1 stop17h 31mFrontier
Deal found 9/16$192
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/42:20 pmSNA - STL
1 stop16h 47mFrontier
Fri 11/77:45 pmSTL - SNA
1 stop19h 50mFrontier
Deal found 9/16$197
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/42:20 pmSNA - STL
1 stop16h 47mMultiple Airlines
Thu 11/66:22 pmSTL - SNA
2 stops24h 29mMultiple Airlines
Deal found 9/16$204
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/42:20 pmSNA - STL
1 stop16h 47mMultiple Airlines
Fri 11/72:12 pmSTL - SNA
2 stops28h 39mMultiple Airlines
Deal found 9/16$211
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/312:01 pmSNA - STL
1 stop19h 06mFrontier
Wed 11/57:45 pmSTL - SNA
1 stop17h 31mFrontier
Deal found 9/16$214
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/52:20 pmSNA - STL
1 stop16h 47mFrontier
Fri 11/77:45 pmSTL - SNA
1 stop19h 50mFrontier
Deal found 9/16$217
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/302:15 pmSNA - PIA
1 stop20h 21mMultiple Airlines
Mon 10/612:56 pmPIA - SNA
1 stop11h 07mMultiple Airlines
Deal found 9/15$261
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/242:15 pmSNA - RFD
1 stop27h 32mMultiple Airlines
Sun 9/288:37 pmRFD - SNA
1 stop17h 38mMultiple Airlines
Deal found 9/16$269

Cheapflights Fare Finder

 
Customize your flight search to find flights from Orange County to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 16, 2025.
Use the filters below to find and compare flights from Orange County to Illinois that are best for you.

Fly from

Orange County

Fly to

Illinois

Route

Depart

Return

Price

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Fri 10/24

2:35 pm-10:14 pm

1 stop5h 39m

Lambert-St Louis

Mon 10/27

12:38 pm-7:08 pm

1 stop8h 30m

$144

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Mon 10/27

12:01 pm-9:07 am

1 stop19h 06m

Lambert-St Louis

Thu 10/30

8:40 pm-11:16 am

1 stop16h 36m

$220

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Tue 11/4

8:09 pm-9:07 am

2 stops10h 58m

Lambert-St Louis

Wed 11/5

7:45 pm-11:16 am

1 stop17h 31m

$222

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Mon 11/3

4:49 pm-9:07 am

2 stops14h 18m

Lambert-St Louis

Wed 11/5

7:45 pm-11:16 am

1 stop17h 31m

$222

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Tue 11/4

2:20 pm-9:07 am

1 stop16h 47m

Lambert-St Louis

Thu 11/6

7:45 pm-11:16 am

1 stop17h 31m

$224

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Mon 11/3

12:01 pm-9:07 am

1 stop19h 06m

Lambert-St Louis

Fri 11/7

7:45 pm-6:26 pm

2 stops48h 41m

$233

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Wed 11/5

2:20 pm-9:07 am

1 stop16h 47m

Lambert-St Louis

Thu 11/6

7:45 pm-11:16 am

1 stop17h 31m

$244

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Mon 11/3

12:01 pm-9:07 am

1 stop19h 06m

Lambert-St Louis

Thu 11/6

7:45 pm-11:16 am

1 stop17h 31m

$246

Santa AnaChicago

SNA - ORD

SNAORD

Santa Ana J. Wayne/Orange Cnty

Fri 10/31

11:05 am-11:50 pm

1 stop10h 45m

Chicago O'Hare Intl

Mon 11/3

7:37 am-2:15 pm

1 stop8h 38m

$273

Santa AnaChicago

SNA - ORD

SNAORD

Santa Ana J. Wayne/Orange Cnty

Wed 10/8

1:48 pm-7:59 pm

Nonstop4h 11m

Chicago O'Hare Intl

Tue 10/14

6:15 am-12:17 pm

1 stop8h 02m

$273

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 60 results
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Best time to book a flight from Orange County to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Orange County with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Orange County to Illinois

What is the cheapest month to book a flight from Orange County to Illinois?

Currently, August is the cheapest month in which you can book a flight from Orange County to Illinois (average of $245). Flying from Orange County to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from KFI to IL?

Find hourly flight availability from Orange County to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Orange County to Illinois as you normally would.

Weekly flight availability from Orange County to Illinois

Explore weekly flight availability from Orange County to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 16, 2025.

The most flights from zzKFI to USIL are scheduled on a Thursday (28 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (20 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated September 16, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and United Airlines from Orange County to Illinois. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,924 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Spirit Airlines
6.3
Okay
8,019 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Orange County to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Orange County to Illinois?

    Frontier, Delta, and United Airlines can get you from Orange County to Illinois in just under 4h 11m. Your travel time can differ by up to 6h 34m. The distance from Orange County to Illinois is about 1721 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Orange County to Illinois one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $72. Delta flights start at $129 while deals on Spirit Airlines start at $131 one-way.

  • Can I find deals for flights from Orange County to Illinois that include hotel bookings?

    Yes. In addition to deals on Orange County to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Orange County to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Orange County to Illinois.

  • Can I find deals for business class flights from Orange County to Illinois?

    Yes. Cheapflights offers flight deals from Orange County to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Orange County to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Orange County to Illinois (average of $245). Flying from Orange County to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Orange County to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Orange County to Illinois

Discover the top 6 airlines that operate flights from Orange County to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$110Average$283FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$117Average$200FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$190Average$459FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$269Average$508FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$269Average$472FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$312Average$446FlexibilityNo cancel feeOn-time63%

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