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$42+ Cheap flights from Oklahoma 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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
OKC — ORD
Dec 20 — Dec 271
Sat 12/20
Sat 12/27
1 adult, Economy
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Find flight deals from Oklahoma to Illinois

Cheapest flights from Oklahoma to Illinois
Explore the most affordable flight options available from Oklahoma to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 20, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/18. 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.
Sun 12/216:01 pmDFW - ORD
Nonstop2h 38mFrontier
Sun 1/49:34 pmORD - DFW
Nonstop2h 46mFrontier
Deal found 11/18$87
This Frontier deal was found by Cheapflights users on 11/17. 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.
Sat 12/202:50 pmDFW - ORD
Nonstop2h 32mFrontier
Sun 1/49:34 pmORD - DFW
Nonstop2h 46mFrontier
Deal found 11/17$88
This Expedia deal was found by Cheapflights users on 11/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1411:47 amDFW - MDW
Nonstop2h 17mFrontier
Mon 12/153:10 pmMDW - DFW
1 stop17h 05mFrontier
Deal found 11/18$88
This Kiwi.com deal was found by Cheapflights users on 11/19. 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 12/254:10 pmDFW - ORD
Nonstop2h 42mFrontier
Tue 12/3010:22 pmORD - DFW
Nonstop2h 44mFrontier
Deal found 11/19$89
This CheapOair deal was found by Cheapflights users on 11/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:15 amDFW - ORD
Nonstop2h 27mFrontier
Sat 12/205:15 amORD - DFW
Nonstop2h 45mFrontier
Deal found 11/17$90
This FlightHub deal was found by Cheapflights users on 11/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:15 amDFW - ORD
Nonstop2h 27mFrontier
Sun 12/149:47 amORD - DFW
Nonstop2h 56mFrontier
Deal found 11/19$92
This Super.com deal was found by Cheapflights users on 11/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:01 pmDFW - ORD
Nonstop2h 38mFrontier
Tue 12/3010:22 pmORD - DFW
Nonstop2h 44mFrontier
Deal found 11/19$93
This Super.com deal was found by Cheapflights users on 11/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/411:47 amDFW - MDW
Nonstop2h 17mFrontier
Sun 12/78:05 amMDW - DFW
Nonstop2h 42mFrontier
Deal found 11/18$93
This Super.com deal was found by Cheapflights users on 11/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:10 amDFW - ORD
1 stop8h 17mFrontier
Sun 12/79:47 amORD - DFW
Nonstop2h 56mFrontier
Deal found 11/18$94
This Super.com deal was found by Cheapflights users on 11/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/89:02 amDFW - MDW
Nonstop2h 18mFrontier
Thu 12/118:05 amMDW - DFW
Nonstop2h 42mFrontier
Deal found 11/19$94
This Frontier deal was found by Cheapflights users on 11/19. 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.
Wed 12/246:01 pmDFW - ORD
Nonstop2h 38mFrontier
Thu 1/17:57 pmORD - DFW
Nonstop2h 54mFrontier
Deal found 11/19$95
This Priceline deal was found by Cheapflights users on 11/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/115:30 amDFW - ORD
Nonstop2h 34mMultiple Airlines
Tue 12/163:26 pmORD - DFW
1 stop7h 46mMultiple Airlines
Deal found 11/19$96

Cheap flight deals from Oklahoma to Illinois

Keep the following information in mind while searching for Oklahoma to Illinois flight deals. Data was last updated November 20, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$87
(Kiwi.com)

One-way from

$42
(Trip.com)

Popular in

March

Cheapest in

September

Average price

$346

Good round-trip deal

$306 or less

Good one-way deal

$171 or less
Provider with most accurate pricing for Oklahoma City Will Rogers World-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Oklahoma City Will Rogers World-Chicago (CHI) flights.
Search Deals
From Oklahoma to Illinois
Search Deals
One-way flight from Oklahoma to Illinois
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($10 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Oklahoma to Illinois.
Search Deals
Price to beat on a one-way flight from Oklahoma to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Oklahoma 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 November 20, 2025.
Use the filters below to find and compare flights from Oklahoma to Illinois that are best for you.

Fly from

Oklahoma

Fly to

Illinois

Route

Depart

Return

Price

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Wed 12/24

6:01 pm-8:39 pm

Nonstop2h 38m

Chicago O'Hare Intl

Thu 1/1

7:57 pm-10:51 pm

Nonstop2h 54m

$93

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Mon 12/15

1:22 pm-3:47 pm

Nonstop2h 25m

Chicago O'Hare Intl

Tue 12/16

7:20 am-9:58 am

Nonstop2h 38m

$95

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Fri 1/9

10:07 pm-12:42 am

Nonstop2h 35m

Chicago O'Hare Intl

Sun 1/11

7:30 am-9:13 pm

1 stop13h 43m

$100

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Fri 1/9

7:00 am-9:29 am

Nonstop2h 29m

Chicago O'Hare Intl

Sun 1/11

7:15 am-10:03 am

Nonstop2h 48m

$117

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Fri 12/19

5:56 pm-8:36 pm

Nonstop2h 40m

Chicago O'Hare Intl

Fri 12/26

7:57 pm-10:40 pm

Nonstop2h 43m

$138

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Thu 12/4

1:22 pm-3:47 pm

Nonstop2h 25m

Chicago O'Hare Intl

Sat 12/6

4:49 pm-7:29 pm

Nonstop2h 40m

$139

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Wed 12/24

10:44 am-1:14 pm

Nonstop2h 30m

Chicago O'Hare Intl

Thu 1/1

8:20 pm-11:06 pm

Nonstop2h 46m

$144

DallasChicago

DFW - MDW

DFWMDW

Dallas/Fort Worth

Fri 1/9

1:15 pm-3:33 pm

Nonstop2h 18m

Chicago Midway

Sun 1/11

12:41 pm-10:59 pm

1 stop10h 18m

$145

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Thu 12/11

9:00 pm-8:59 am

1 stop11h 59m

Lambert-St Louis

Sun 12/14

10:42 am-11:05 pm

2 stops12h 23m

$166

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Wed 12/24

4:20 pm-12:02 am

1 stop7h 42m

Chicago O'Hare Intl

Thu 1/1

5:31 pm-12:28 am

1 stop6h 57m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/18

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

Have a flexible travel schedule? Discover the best time to fly to Illinois from Oklahoma 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 Oklahoma to Illinois

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

Currently, June is the cheapest month in which you can book a flight from Oklahoma to Illinois (average of $121). Flying from Oklahoma to Illinois in January is currently the most expensive (average of $265). 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 OK to IL?

Find hourly flight availability from Oklahoma 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 November 20, 2025.

A simple way to save on the total cost of your ticket is to fly from Oklahoma to Illinois in the morning. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight in the evening.

What is the cheapest day to fly from Oklahoma to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Oklahoma to Illinois. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Oklahoma to Illinois flight should consider departing on Tuesday at noon when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Oklahoma to Illinois

Explore weekly flight availability from Oklahoma 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 November 20, 2025.

The most flights from USOK to USIL are scheduled on a Thursday (29 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (21 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 November 20, 2025.
See what other customers who have flown with Southwest, United Airlines, and American Airlines from Oklahoma to Illinois have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,251 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,251 reviews
Southwest
8.0
Very good
4,251 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
9,029 reviews
Southwest
8.0
Very good
4,251 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,047 reviews
Southwest
8.0
Very good
4,251 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,103 reviews
Southwest
8.0
Very good
4,251 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Oklahoma 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 Oklahoma to Illinois?

    A quick flight from Oklahoma to Illinois can take about 2h 25m. Frontier provides one of the quickest options available for as low as $95. There are 801 mi between Oklahoma and Illinois. All flights are typically nonstop.

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

    One-way options have recently been found by users for as low as $45 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $55 and United Airlines from $59 one-way.

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

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

  • How can I find direct flights from Oklahoma to Illinois?

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

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

    Yes. Cheapflights offers flight deals from Oklahoma 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 Oklahoma to Illinois?

    Currently, June is the cheapest month in which you can book a flight from Oklahoma to Illinois (average of $121). Flying from Oklahoma to Illinois in January is currently the most expensive (average of $265). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Oklahoma to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Oklahoma to Illinois

Discover the top 4 airlines that operate flights from Oklahoma 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 November 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$118Average$238FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$189Average$342FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$197Average$367FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$259Average$404FlexibilityNo cancel feeOn-time69%

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