HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$27+ 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 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
OKC — ORD
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Oklahoma to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 August 14, 2025.

Round-trip from

$113
(Cheapflightsfares)

One-way from

$27
(Cheapflightsfares)

Popular in

March

Cheapest in

February

Average price

$364

Good round-trip deal

$242 or less

Good one-way deal

$158 or less
From Oklahoma to Illinois
Search Deals
One-way flight from Oklahoma to Illinois
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($3 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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

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 August 14, 2025.

This Booking.com deal was found by Cheapflights users on 8/13. 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 9/1910:25 pmDFW - STL
1 stop10h 41mFrontier
Sun 9/2110:39 amSTL - DFW
Nonstop1h 50mFrontier
Deal found 8/13$111
This Frontier deal was found by Cheapflights users on 8/14. 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.
Thu 9/1110:25 pmDFW - STL
1 stop10h 41mFrontier
Sun 9/1410:39 amSTL - DFW
Nonstop1h 50mFrontier
Deal found 8/14$115
This Frontier deal was found by Cheapflights users on 8/14. 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 9/269:27 pmDFW - ORD
Nonstop2h 31mFrontier
Tue 10/75:28 pmORD - DFW
Nonstop2h 48mFrontier
Deal found 8/14$115
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/59:27 pmDFW - ORD
Nonstop2h 31mFrontier
Mon 9/87:40 amORD - DFW
1 stop6h 12mFrontier
Deal found 8/14$116
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/115:45 pmDFW - MDW
1 stop5h 35mFrontier
Mon 9/157:15 amMDW - DFW
Nonstop2h 31mFrontier
Deal found 8/14$116
This Priceline deal was found by Cheapflights users on 8/12. 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.
Tue 9/98:00 amDFW - ORD
Nonstop2h 40mMultiple Airlines
Tue 9/167:09 pmORD - DFW
1 stop10h 41mMultiple Airlines
Deal found 8/12$117
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 9/258:00 amDFW - STL
Nonstop1h 54mFrontier
Sun 9/2810:39 amSTL - DFW
Nonstop1h 50mFrontier
Deal found 8/12$118
This Frontier deal was found by Cheapflights users on 8/14. 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.
Wed 10/18:00 amDFW - ORD
Nonstop2h 40mFrontier
Wed 10/811:00 amORD - DFW
1 stop7h 07mFrontier
Deal found 8/14$118
This Frontier deal was found by Cheapflights users on 8/13. 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.
Mon 9/295:40 amDFW - MDW
1 stop10h 20mFrontier
Mon 10/69:47 pmMDW - DFW
Nonstop2h 34mFrontier
Deal found 8/13$118
This Frontier deal was found by Cheapflights users on 8/13. 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.
Thu 10/97:30 amDFW - STL
Nonstop1h 52mFrontier
Sun 10/1210:17 amSTL - DFW
Nonstop1h 57mFrontier
Deal found 8/13$119
This Frontier deal was found by Cheapflights users on 8/12. 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.
Thu 10/29:27 pmDFW - ORD
Nonstop2h 31mFrontier
Fri 10/105:25 amORD - DFW
Nonstop2h 33mFrontier
Deal found 8/12$119
This Frontier deal was found by Cheapflights users on 8/14. 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.
Thu 10/26:55 amDFW - MDW
Nonstop2h 23mFrontier
Sun 10/56:20 amMDW - DFW
1 stop13h 34mFrontier
Deal found 8/14$119

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 August 14, 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

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Fri 9/26

10:25 pm-9:06 am

1 stop10h 41m

Lambert-St Louis

Sun 9/28

10:39 am-12:29 pm

Nonstop1h 50m

$115

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Thu 9/11

10:25 pm-9:06 am

1 stop10h 41m

Lambert-St Louis

Sun 9/14

10:39 am-12:29 pm

Nonstop1h 50m

$115

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Sat 11/1

10:25 pm-10:07 am

1 stop11h 42m

Lambert-St Louis

Sun 11/2

7:02 pm-8:59 pm

Nonstop1h 57m

$115

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Thu 9/11

6:00 am-3:04 pm

1 stop9h 04m

Lambert-St Louis

Thu 9/18

10:49 am-12:39 pm

Nonstop1h 50m

$115

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Fri 10/10

9:36 pm-9:07 am

1 stop11h 31m

Lambert-St Louis

Sun 10/12

10:17 am-12:14 pm

Nonstop1h 57m

$115

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Fri 9/5

10:25 pm-9:06 am

1 stop10h 41m

Lambert-St Louis

Sun 9/7

10:39 am-12:29 pm

Nonstop1h 50m

$115

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Tue 10/14

2:22 pm-11:53 pm

1 stop9h 31m

Chicago O'Hare Intl

Sun 10/19

5:25 am-7:58 am

Nonstop2h 33m

$115

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Thu 10/30

10:24 pm-12:59 am

Nonstop2h 35m

Chicago O'Hare Intl

Mon 11/3

6:20 pm-9:09 pm

Nonstop2h 49m

$116

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Sat 11/1

10:24 pm-12:59 am

Nonstop2h 35m

Chicago O'Hare Intl

Mon 11/3

11:12 am-1:47 pm

Nonstop2h 35m

$116

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Thu 10/30

10:24 pm-12:59 am

Nonstop2h 35m

Chicago O'Hare Intl

Sat 11/1

6:25 pm-9:14 pm

Nonstop2h 49m

$116

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 60 results
1
2
3
...
6

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, August is the cheapest month in which you can book a flight from Oklahoma to Illinois (average of $245). Flying from Oklahoma 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 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 August 14, 2025.

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

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 August 14, 2025.

The most flights from USOK to USIL are scheduled on a Thursday (29 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (11 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 August 14, 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
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,217 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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.

  • 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 $27 on Frontier. Other airlines that offer cheap prices include United Airlines from $70 and Southwest from $105 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, August is the cheapest month in which you can book a flight from Oklahoma to Illinois (average of $245). Flying from Oklahoma 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Oklahoma to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
Dallas/Fort Worth to O'Hare Intl flights
John F Kennedy Intl to Los Angeles flights
Dallas/Fort Worth to Seattle flights
Dallas/Fort Worth to LaGuardia flights
John F Kennedy Intl to Las Vegas flights
Dallas/Fort Worth to Las Vegas flights
San Francisco to John F Kennedy Intl flights
Newark to Fort Lauderdale flights
Dallas/Fort Worth to John F Kennedy Intl flights
LaGuardia to Fort Lauderdale flights
John F Kennedy Intl to O'Hare Intl flights
Newark to Los Angeles flights
Newark to O'Hare Intl flights
John F Kennedy Intl to Miami flights
LaGuardia to Dallas/Fort Worth flights
Los Angeles to Seattle flights
Los Angeles to Newark flights
Dallas/Fort Worth to Midway flights
Los Angeles to Honolulu flights
O'Hare Intl to John F Kennedy Intl flights
Newark to Miami flights
LaGuardia to Miami flights
O'Hare Intl to LaGuardia flights
LaGuardia to O'Hare Intl flights
John F Kennedy Intl to Dallas/Fort Worth flights
John F Kennedy Intl to Orlando flights
Newark to Las Vegas flights
Ontario to Seattle flights
O'Hare Intl to Newark flights
O'Hare Intl to Las Vegas flights
John F Kennedy Intl to San Francisco flights
John F Kennedy Intl to Fort Lauderdale flights
San Francisco to Newark flights
Seattle to Dallas/Fort Worth flights
Dallas/Fort Worth to Newark flights
Newark to Orlando flights
Los Angeles to Las Vegas flights
Dallas/Fort Worth to Los Angeles flights
Seattle to Las Vegas flights
Dallas/Fort Worth to Denver flights
Baltimore to Dallas/Fort Worth flights
Dulles Intl to Dallas/Fort Worth flights
Los Angeles to LaGuardia flights
Los Angeles to Dallas/Fort Worth flights
LaGuardia to Atlanta flights
LaGuardia to Orlando flights
O'Hare Intl to Dallas/Fort Worth flights
San Francisco to Los Angeles flights
Newark to Dallas/Fort Worth flights

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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$118Average$195FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$196Average$368FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$197Average$360FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$243Average$417FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.