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$40+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
OKC — ORD
Apr 5 — Apr 121
Sat 4/5
Sat 4/12
1 adult, Economy
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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 March 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$77
(Kiwi.com)

One-way from

$40
(Frontier)

Popular in

March

Cheapest in

April

Average price

$387

Good round-trip deal

$326 or less

Good one-way deal

$193 or less
Provider with most accurate pricing for Oklahoma City Will Rogers World-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Oklahoma City Will Rogers World-Chicago (CHI) flights.
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From Oklahoma to Illinois
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One-way flight from Oklahoma to Illinois
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High demand for flights, 4% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Oklahoma to Illinois.
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Price to beat on a one-way flight from Oklahoma to Illinois.
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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 March 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/2412:24 pmDFW - ORD
Nonstop2h 32mFrontier
Sun 4/278:30 amORD - DFW
Nonstop2h 49mFrontier
Deal found 3/31$77
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/281:15 pmDFW - MDW
Nonstop2h 19mFrontier
Mon 5/52:45 pmMDW - DFW
Nonstop2h 32mFrontier
Deal found 3/31$77
This FlightHub deal was found by Cheapflights users on 3/31. 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.
Sat 4/266:10 amDFW - ORD
Nonstop2h 25mMultiple Airlines
Sun 4/278:30 amORD - DFW
Nonstop2h 49mMultiple Airlines
Deal found 3/31$89
This Cheapflightsfares deal was found by Cheapflights users on 3/30. 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 4/176:10 amDFW - ORD
Nonstop2h 25mSpirit Airlines
Sat 4/1911:53 amORD - DFW
Nonstop2h 40mSpirit Airlines
Deal found 3/30$95
This United Airlines deal was found by Cheapflights users on 3/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/258:45 pmDFW - ORD
Nonstop2h 29mUnited Airlines
Mon 4/287:00 amORD - DFW
Nonstop2h 42mUnited Airlines
Deal found 3/30$147
This Mytrip deal was found by Cheapflights users on 3/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/710:25 amDFW - ORD
1 stop3h 50mContour
Sun 4/1311:45 amORD - DFW
1 stop3h 55mContour
Deal found 3/30$172
This Delta deal was found by Cheapflights users on 3/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/711:37 amDFW - MDW
1 stop7h 08mDelta
Wed 5/2112:48 pmMDW - DFW
1 stop7h 27mDelta
Deal found 3/31$199
This CheapOair deal was found by Cheapflights users on 3/29. 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.
Fri 6/610:26 pmDFW - STL
1 stop10h 46mFrontier
Sun 6/158:44 pmSTL - DFW
Nonstop1h 58mFrontier
Deal found 3/29$200
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/267:00 amDFW - ORD
1 stop5h 21mDelta
Wed 6/49:00 amORD - DFW
1 stop5h 06mDelta
Deal found 3/30$207
This Mytrip deal was found by Cheapflights users on 3/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/247:17 amDFW - STL
1 stop9h 58mSpirit Airlines
Tue 4/296:10 pmSTL - DFW
1 stop15h 22mSpirit Airlines
Deal found 3/31$230
This United Airlines deal was found by Cheapflights users on 3/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/256:15 pmTUL - ORD
Nonstop2h 10mUnited Airlines
Fri 5/3012:45 pmORD - TUL
Nonstop2h 04mUnited Airlines
Deal found 3/31$231
This Booking.com deal was found by Cheapflights users on 3/30. 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.
Thu 4/247:17 amDFW - STL
1 stop9h 58mMultiple Airlines
Sat 4/265:41 pmSTL - DFW
1 stop17h 53mMultiple Airlines
Deal found 3/30$233

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 March 31, 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

Thu 4/24

12:24 pm-2:56 pm

Nonstop2h 32m

Chicago O'Hare Intl

Sun 4/27

8:30 am-11:19 am

Nonstop2h 49m

$77

DallasChicago

DFW - MDW

DFWMDW

Dallas/Fort Worth

Mon 4/28

1:15 pm-3:34 pm

Nonstop2h 19m

Chicago Midway

Mon 5/5

2:45 pm-5:17 pm

Nonstop2h 32m

$77

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Sat 4/26

6:10 am-8:35 am

Nonstop2h 25m

Chicago O'Hare Intl

Sun 4/27

8:30 am-11:19 am

Nonstop2h 49m

$89

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Thu 4/17

6:10 am-8:35 am

Nonstop2h 25m

Chicago O'Hare Intl

Sat 4/19

11:53 am-2:33 pm

Nonstop2h 40m

$95

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Fri 4/25

8:45 pm-11:14 pm

Nonstop2h 29m

Chicago O'Hare Intl

Mon 4/28

7:00 am-9:42 am

Nonstop2h 42m

$147

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Mon 4/7

10:25 am-2:15 pm

1 stop3h 50m

Chicago O'Hare Intl

Sun 4/13

11:45 am-3:40 pm

1 stop3h 55m

$172

DallasChicago

DFW - MDW

DFWMDW

Dallas/Fort Worth

Wed 5/7

11:37 am-6:45 pm

1 stop7h 08m

Chicago Midway

Wed 5/21

12:48 pm-8:15 pm

1 stop7h 27m

$199

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Fri 6/6

10:26 pm-9:12 am

1 stop10h 46m

Lambert-St Louis

Sun 6/15

8:44 pm-10:42 pm

Nonstop1h 58m

$200

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Sat 4/26

7:00 am-12:21 pm

1 stop5h 21m

Chicago O'Hare Intl

Wed 6/4

9:00 am-2:06 pm

1 stop5h 06m

$207

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Wed 5/7

11:04 am-3:15 pm

1 stop4h 11m

Chicago O'Hare Intl

Sat 5/10

1:58 pm-4:36 pm

Nonstop2h 38m

$208

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

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, 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 $323). 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 March 31, 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 March 31, 2025.

The most flights from USOK to USIL are scheduled on a Monday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 March 31, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Oklahoma to Illinois. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,818 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,818 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,276 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,614 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Allegiant Air
7.3
Good
731 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 $40 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $47 and United Airlines from $74 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 $323). 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 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 March 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$123Average$178FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$208Average$411FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$208Average$380FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$278Average$368FlexibilityNo cancel feeOn-time63%
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