$60+ 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
OKC — ORD
Feb 26 — Mar 51
1 adult, Economy
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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
Cheapest flights from Oklahoma to IllinoisExplore 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 January 27, 2026.
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 January 27, 2026.
This Frontier deal was found by Cheapflights users on 1/27. 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 4/2912:30 pm
DFW
- ORD
Nonstop2h 41m
Frontier
Mon 5/46:09 pm
ORD
- DFW
Nonstop2h 58m
Frontier
Deal found 1/27![Frontier logo]()
$83
This Frontier deal was found by Cheapflights users on 1/27. 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 5/710:17 pm
DFW
- ORD
Nonstop2h 35m
Frontier
Mon 5/116:09 pm
ORD
- DFW
Nonstop2h 58m
Frontier
Deal found 1/27![Frontier logo]()
$84
This Frontier deal was found by Cheapflights users on 1/27. 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 5/78:03 pm
DFW
- MDW
Nonstop2h 18m
Frontier
Mon 5/114:09 pm
MDW
- DFW
Nonstop2h 54m
Frontier
Deal found 1/27![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Fri 2/275:01 am
DFW
- ORD
Nonstop2h 33m
Frontier
Mon 3/23:40 pm
ORD
- DFW
Nonstop3h 00m
Frontier
Deal found 1/26![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 4/68:55 pm
DFW
- MDW
Nonstop2h 18m
Frontier
Fri 4/105:11 pm
MDW
- DFW
Nonstop2h 49m
Frontier
Deal found 1/27![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 1/26. 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.
Fri 3/610:17 pm
DFW
- ORD
Nonstop2h 36m
Frontier
Sun 3/85:21 am
ORD
- DFW
Nonstop2h 52m
Frontier
Deal found 1/26![Frontier logo]()
$87
This Expedia deal was found by Cheapflights users on 1/26. 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.
Sat 2/218:42 pm
DFW
- ORD
Nonstop2h 35m
Multiple Airlines
Wed 2/258:16 pm
ORD
- DFW
1 stop13h 42m
Multiple Airlines
Deal found 1/26![Multiple Airlines logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 1/25. 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.
Sat 2/218:42 pm
DFW
- ORD
Nonstop2h 35m
Frontier
Sat 2/284:29 pm
ORD
- DFW
Nonstop3h 01m
Frontier
Deal found 1/25![Frontier logo]()
$89
This Super.com deal was found by Cheapflights users on 1/25. 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.
Sat 3/76:05 pm
DFW
- MDW
Nonstop2h 16m
Frontier
Wed 3/1111:25 am
MDW
- DFW
Nonstop2h 43m
Frontier
Deal found 1/25![Frontier logo]()
$90
This Expedia deal was found by Cheapflights users on 1/26. 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.
Sat 2/218:42 pm
DFW
- ORD
Nonstop2h 35m
Multiple Airlines
Mon 2/2312:44 pm
ORD
- DFW
1 stop10h 05m
Multiple Airlines
Deal found 1/26![Multiple Airlines logo]()
$91
This Trip.com deal was found by Cheapflights users on 1/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:55 pm
DFW
- MDW
Nonstop2h 18m
Frontier
Mon 4/135:11 pm
MDW
- DFW
Nonstop2h 49m
Frontier
Deal found 1/26![Frontier logo]()
$91
This Expedia deal was found by Cheapflights users on 1/26. 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.
Sat 2/2110:44 am
DFW
- MDW
1 stop10h 49m
Frontier
Sat 2/289:15 am
MDW
- DFW
Nonstop2h 45m
Frontier
Deal found 1/26![Frontier logo]()
$92
Find flight deals from Oklahoma to Illinois
Keep the following information in mind while searching for Oklahoma to Illinois flight deals. Data was last updated January 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $83 (Frontier) |
One-way from | $60 (CheapOair) |
Popular in | March |
Cheapest in | September |
Average price | $327 |
Good round-trip deal | $353 or less |
Good one-way deal | $185 or less |
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 January 27, 2026.
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
TulsaSt. Louis
TUL - STL
TULSTL
Tulsa
Tue 2/24
12:20 pm-8:35 pm
2 stops8h 15m
Lambert-St Louis
Tue 3/3
10:35 am-3:30 pm
1 stop4h 55m
$122
DallasSt. Louis
DFW - STL
DFWSTL
Dallas/Fort Worth
Mon 2/23
9:38 am-8:02 pm
1 stop10h 24m
Lambert-St Louis
Mon 3/2
8:22 pm-7:02 am
1 stop10h 40m
$131
DallasChicago
DFW - MDW
DFWMDW
Dallas/Fort Worth
Sat 2/28
10:44 am-9:39 pm
1 stop10h 55m
Chicago Midway
Mon 3/2
2:19 pm-10:41 pm
1 stop8h 22m
$144
DallasSt. Louis
DFW - STL
DFWSTL
Dallas/Fort Worth
Fri 2/6
8:40 pm-6:51 am
1 stop10h 11m
Lambert-St Louis
Mon 2/9
8:22 pm-4:15 pm
1 stop19h 53m
$150
DallasSt. Louis
DFW - STL
DFWSTL
Dallas/Fort Worth
Tue 2/24
8:40 pm-6:51 am
1 stop10h 11m
Lambert-St Louis
Tue 3/3
3:49 pm-7:02 am
2 stops15h 13m
$162
DallasChicago
DFW - ORD
DFWORD
Dallas/Fort Worth
Mon 2/9
6:10 am-10:46 pm
1 stop16h 36m
Chicago O'Hare Intl
Thu 2/12
4:42 pm-10:48 pm
1 stop6h 06m
$171
Oklahoma CityChicago
OKC - ORD
OKCORD
Oklahoma City Will Rogers World
Fri 2/27
4:52 pm-10:39 pm
1 stop5h 47m
Chicago O'Hare Intl
Sun 3/1
3:40 pm-3:56 pm
2 stops24h 16m
$172
DallasSt. Louis
DFW - STL
DFWSTL
Dallas/Fort Worth
Wed 3/4
8:35 am-1:43 pm
1 stop5h 08m
Lambert-St Louis
Wed 3/4
4:13 pm-6:15 pm
Nonstop2h 02m
$173
DallasChicago
DFW - ORD
DFWORD
Dallas/Fort Worth
Sat 2/28
6:50 am-11:45 am
1 stop4h 55m
Chicago O'Hare Intl
Sat 2/28
5:37 pm-11:00 pm
1 stop5h 23m
$177
DallasChicago
DFW - ORD
DFWORD
Dallas/Fort Worth
Sat 3/7
6:35 pm-11:56 pm
1 stop5h 21m
Chicago O'Hare Intl
Tue 3/10
9:50 am-3:25 pm
1 stop5h 35m
$177
Showing 1-10 of 60 results
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 $127). Flying from Oklahoma to Illinois in April is currently the most expensive (average of $258). 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 January 27, 2026.
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 29% 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 January 24, 2026.
Travelers seeking maximum savings on their Oklahoma to Illinois flight should consider departing on Saturday 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 January 27, 2026.
The most flights from USOK to USIL are scheduled on a Tuesday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (12 on average).
How much does it cost to fly round-trip from Oklahoma to Illinois?
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 January 27, 2026.
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.
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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.
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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.
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 January 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$151 | Average$238 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$167 | Average$371 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$182 | Average$380 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$189 | Average$348 | FlexibilityNo cancel fee | On-time71% |