$176+ Cheap flights from Sioux City (SUX) to Illinois
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — ORD
Oct 10 — Oct 171
Round-trip
1 adult, Economy
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Find cheap flights from Sioux City 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
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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 Sioux City to Illinois
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Cheapest flights from Sioux City to IllinoisExplore the most affordable flight options available from Sioux City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.
Explore the most affordable flight options available from Sioux City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 10/38:35 am -
Nonstop1h 54m
Mon 10/54:00 pm -
Nonstop1h 53m
Deal found 9/9![United Airlines logo]()
$305
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Tue 12/85:00 am -
Nonstop1h 59m
Thu 12/104:00 pm -
Nonstop1h 54m
Deal found 9/9![United Airlines logo]()
$346
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Wed 9/238:05 am -
Nonstop1h 54m
Sun 9/274:00 pm -
Nonstop1h 53m
Deal found 9/7![United Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Thu 9/248:35 am -
Nonstop1h 54m
Mon 9/284:00 pm -
Nonstop1h 53m
Deal found 9/9![United Airlines logo]()
$371
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Sat 9/129:05 am -
Nonstop1h 54m
Mon 9/144:00 pm -
Nonstop1h 53m
Deal found 9/6![United Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Thu 9/178:05 am -
Nonstop1h 54m
Sun 9/204:00 pm -
Nonstop1h 53m
Deal found 9/8![United Airlines logo]()
$400
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Tue 9/228:06 am -
Nonstop1h 54m
Fri 9/254:00 pm -
Nonstop1h 53m
Deal found 9/6![United Airlines logo]()
$403
This United Airlines deal was found by Cheapflights users on 9/6. 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 10/168:35 am -
Nonstop1h 54m
Sun 10/184:00 pm -
Nonstop1h 53m
Deal found 9/6![United Airlines logo]()
$434
Best flights from Sioux City to IllinoisDiscover carefully curated flight deals from Sioux City to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.
Discover carefully curated flight deals from Sioux City to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 1/309:03 am -
Nonstop1h 52m
Wed 2/34:00 pm -
Nonstop1h 54m
Deal found 9/9![United Airlines logo]()
$264
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 10/38:35 am -
Nonstop1h 54m
Mon 10/54:00 pm -
Nonstop1h 53m
Deal found 9/9![United Airlines logo]()
$305
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Wed 9/238:05 am -
Nonstop1h 54m
Sun 9/274:00 pm -
Nonstop1h 53m
Deal found 9/7![United Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Tue 9/228:06 am -
Nonstop1h 54m
Fri 9/254:00 pm -
Nonstop1h 53m
Deal found 9/6![United Airlines logo]()
$403
This United Airlines deal was found by Cheapflights users on 9/6. 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 10/168:35 am -
Nonstop1h 54m
Sun 10/184:00 pm -
Nonstop1h 53m
Deal found 9/6![United Airlines logo]()
$434
Last-minute flights from Sioux City to IllinoisDiscover last-minute flight deals from Sioux City to Illinois. Data last updated September 10, 2026 and is based on user searches.
Discover last-minute flight deals from Sioux City to Illinois. Data last updated September 10, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Sat 9/129:05 am -
Nonstop1h 54m
Mon 9/144:00 pm -
Nonstop1h 53m
Deal found 9/6![United Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Sat 9/126:30 pm -
2 stops18h 45m
Sun 9/134:00 pm -
Nonstop1h 53m
Deal found 9/7![United Airlines logo]()
$474
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Thu 9/178:05 am -
Nonstop1h 54m
Sun 9/204:00 pm -
Nonstop1h 53m
Deal found 9/8![United Airlines logo]()
$400
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Tue 9/228:06 am -
Nonstop1h 54m
Fri 9/254:00 pm -
Nonstop1h 53m
Deal found 9/6![United Airlines logo]()
$403
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Wed 9/238:05 am -
Nonstop1h 54m
Sun 9/274:00 pm -
Nonstop1h 53m
Deal found 9/7![United Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Thu 9/248:35 am -
Nonstop1h 54m
Mon 9/284:00 pm -
Nonstop1h 53m
Deal found 9/9![United Airlines logo]()
$371
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 10/38:35 am -
Nonstop1h 54m
Mon 10/54:00 pm -
Nonstop1h 53m
Deal found 9/9![United Airlines logo]()
$305
This United Airlines deal was found by Cheapflights users on 9/6. 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 10/168:35 am -
Nonstop1h 54m
Sun 10/184:00 pm -
Nonstop1h 53m
Deal found 9/6![United Airlines logo]()
$434
One-way flights from Sioux City to IllinoisSearch for one-way flight options from Sioux City to Illinois. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.
Search for one-way flight options from Sioux City to Illinois. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/258:35 am -
Nonstop1h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![United Airlines logo]()
$176
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Mon 9/288:35 am -
Nonstop1h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![United Airlines logo]()
$185
This United Airlines deal was found by Cheapflights users on 9/8. 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 12/276:46 pm -
1 stop14h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![United Airlines logo]()
$415
Find flight deals from Sioux City to Illinois
Keep the following information in mind while searching for Sioux City to Illinois flight deals. Data was last updated September 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $224 (United Airlines) |
One-way from | $176 (United Airlines) |
Good round-trip deal | $469 or less |
Good one-way deal | $307 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Sioux City 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 7,457,451 searches. Data last updated September 10, 2026.
Use the filters below to find and compare flights from Sioux City to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
Sioux CityChicago
SUX Sioux City Sioux Gateway - ORD Chicago O'Hare Intl
SUXORD
Sioux City Sioux Gateway
Fri 9/25
8:35 am-10:29 am
Nonstop1h 54m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$176
Sioux CityChicago
SUX Sioux City Sioux Gateway - ORD Chicago O'Hare Intl
SUXORD
Sioux City Sioux Gateway
Mon 9/28
8:35 am-10:29 am
Nonstop1h 54m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$185
Sioux CityChicago
SUX Sioux City Sioux Gateway - ORD Chicago O'Hare Intl
SUXORD
Sioux City Sioux Gateway
Sat 1/30
9:03 am-10:55 am
Nonstop1h 52m
Chicago O'Hare Intl
Wed 2/3
4:00 pm-5:54 pm
Nonstop1h 54m
$264
Sioux CityChicago
SUX Sioux City Sioux Gateway - ORD Chicago O'Hare Intl
SUXORD
Sioux City Sioux Gateway
Sat 10/3
8:35 am-10:29 am
Nonstop1h 54m
Chicago O'Hare Intl
Mon 10/5
4:00 pm-5:53 pm
Nonstop1h 53m
$305
Sioux CityChicago
SUX Sioux City Sioux Gateway - ORD Chicago O'Hare Intl
SUXORD
Sioux City Sioux Gateway
Wed 9/23
8:05 am-9:59 am
Nonstop1h 54m
Chicago O'Hare Intl
Sun 9/27
4:00 pm-5:53 pm
Nonstop1h 53m
$359
Sioux CityChicago
SUX Sioux City Sioux Gateway - ORD Chicago O'Hare Intl
SUXORD
Sioux City Sioux Gateway
Tue 9/22
8:06 am-10:00 am
Nonstop1h 54m
Chicago O'Hare Intl
Fri 9/25
4:00 pm-5:53 pm
Nonstop1h 53m
$403
Sioux CityChicago
SUX Sioux City Sioux Gateway - ORD Chicago O'Hare Intl
SUXORD
Sioux City Sioux Gateway
Sun 12/27
6:46 pm-9:34 am
1 stop14h 48m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$415
Sioux CityChicago
SUX Sioux City Sioux Gateway - ORD Chicago O'Hare Intl
SUXORD
Sioux City Sioux Gateway
Fri 10/16
8:35 am-10:29 am
Nonstop1h 54m
Chicago O'Hare Intl
Sun 10/18
4:00 pm-5:53 pm
Nonstop1h 53m
$434
Sorted by cheapest first
Best time to book a flight from Sioux City to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Sioux City with our price prediction graph.
SUX-ORD
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 Sioux City to Illinois
SUX-USIL
SUX-ORD
What is the cheapest time of day to fly from SUX to IL?
Find hourly flight availability from Sioux City 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 10, 2026.
When flying from Sioux City to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
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 10, 2026.
Read reviews from past customers who have flown United Airlines from Sioux City to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
6.7
Boarding
7.7
Crew
8.1
Entertainment
7.1
Overall
7.4
Comfort
7.3
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Food
6.7
Boarding
7.7
Crew
8.1
Entertainment
7.1
Overall
7.4
Comfort
7.3
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Related info for your journey
Find useful and relevant information for your journey from Sioux City 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 Sioux City to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Sioux City to Illinois by cabin class
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Sioux City and Illinois flights
Browse other Sioux City and Illinois flight options. Last updated on September 10, 2026.
Popular flight searches
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Sioux City to Illinois flights
Consider these flights traveling from Sioux City to Illinois.
Top airline flying from Sioux City to Illinois
Discover the top airline that operate flights from Sioux City 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 7,457,451 searches. Data last updated September 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$224 | Average$397 | FlexibilityNo cancel fee | On-time69% |