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$73+ Cheap flights from Raleigh (RDU) 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from Raleigh to Illinois

Keep the following information in mind while searching for Raleigh to Illinois flight deals. Data was last updated August 18, 2025.

Round-trip from

$139
(American Airlines)

One-way from

$73
(Priceline)

Popular in

March

Cheapest in

August

Average price

$211

Good round-trip deal

$193 or less

Good one-way deal

$118 or less
From Raleigh-Durham to Illinois
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One-way flight from Raleigh-Durham to Illinois
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Highest demand for flights based on searches. 17% potential increase in price ($60 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Raleigh-Durham to Illinois.
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Price to beat on a one-way flight from Raleigh-Durham to Illinois.
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Find flight deals from Raleigh to Illinois

Cheapest flights from Raleigh to Illinois
Explore the most affordable flight options available from Raleigh to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This United Airlines deal was found by Cheapflights users on 8/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/14:49 pmRDU - ORD
Nonstop2h 29mUnited Airlines
Tue 11/117:10 amORD - RDU
Nonstop2h 04mUnited Airlines
Deal found 8/18$139
This Southwest deal was found by Cheapflights users on 8/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/16:35 amRDU - MDW
Nonstop1h 55mSouthwest
Tue 11/116:05 pmMDW - RDU
Nonstop1h 50mSouthwest
Deal found 8/18$139
This CheapOair deal was found by Cheapflights users on 8/16. 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.
Wed 9/106:45 amRDU - ORD
1 stop11h 54mFrontier
Sun 9/1411:36 amORD - RDU
Nonstop2h 14mFrontier
Deal found 8/16$141
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Wed 9/176:45 amRDU - ORD
1 stop11h 54mFrontier
Sat 9/2012:22 pmORD - RDU
1 stop9h 25mFrontier
Deal found 8/17$143
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Fri 10/177:15 pmRDU - MDW
1 stop5h 10mFrontier
Mon 10/206:20 amMDW - RDU
1 stop11h 00mFrontier
Deal found 8/17$143
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Fri 11/77:05 pmRDU - ORD
1 stop6h 06mFrontier
Sun 11/165:01 amORD - RDU
1 stop7h 28mFrontier
Deal found 8/17$144
This CheapOair deal was found by Cheapflights users on 8/16. 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.
Mon 10/208:49 amRDU - MDW
1 stop9h 38mFrontier
Thu 10/238:25 amMDW - RDU
1 stop4h 16mFrontier
Deal found 8/16$144
This FlightHub deal was found by Cheapflights users on 8/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/242:27 pmRDU - ORD
Nonstop2h 22mFrontier
Sun 10/262:41 pmORD - RDU
Nonstop2h 06mFrontier
Deal found 8/17$146
This CheapOair deal was found by Cheapflights users on 8/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/99:44 pmRDU - ORD
Nonstop2h 22mFrontier
Mon 10/136:00 amORD - RDU
1 stop6h 32mFrontier
Deal found 8/18$147
This Frontier deal was found by Cheapflights users on 8/17. 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.
Fri 9/196:42 pmRDU - ORD
1 stop6h 28mFrontier
Sun 9/2111:36 amORD - RDU
Nonstop2h 14mFrontier
Deal found 8/17$148
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Thu 10/26:38 pmRDU - MDW
1 stop5h 42mFrontier
Sun 10/56:21 amMDW - RDU
1 stop9h 50mFrontier
Deal found 8/17$148
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:38 pmRDU - ORD
1 stop6h 32mFrontier
Sun 10/56:10 amORD - RDU
1 stop6h 28mFrontier
Deal found 8/17$149

Cheapflights Fare Finder

 
Customize your flight search to find flights from Raleigh 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 18, 2025.
Use the filters below to find and compare flights from Raleigh to Illinois that are best for you.

Fly from

Raleigh

Fly to

Illinois

Route

Depart

Return

Price

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 11/1

4:49 pm-6:18 pm

Nonstop2h 29m

Chicago O'Hare Intl

Tue 11/11

7:10 am-10:14 am

Nonstop2h 04m

$139

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Sat 11/1

6:35 am-7:30 am

Nonstop1h 55m

Chicago Midway

Tue 11/11

6:05 pm-8:55 pm

Nonstop1h 50m

$139

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Fri 9/12

6:22 am-3:50 pm

1 stop10h 28m

Chicago O'Hare Intl

Sun 9/14

11:36 am-2:50 pm

Nonstop2h 14m

$141

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Wed 9/10

6:45 am-5:39 pm

1 stop11h 54m

Chicago O'Hare Intl

Sun 9/14

11:36 am-2:50 pm

Nonstop2h 14m

$141

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sun 9/7

6:38 pm-12:10 am

1 stop6h 32m

Chicago O'Hare Intl

Tue 9/9

11:45 am-8:37 pm

1 stop7h 52m

$143

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Tue 9/23

6:45 am-5:39 pm

1 stop11h 54m

Chicago O'Hare Intl

Fri 9/26

5:10 am-5:38 pm

1 stop11h 28m

$143

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Wed 9/10

6:45 am-5:39 pm

1 stop11h 54m

Chicago O'Hare Intl

Sat 9/13

12:22 pm-10:47 pm

1 stop9h 25m

$143

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Fri 11/7

6:10 am-4:56 pm

1 stop11h 46m

Chicago O'Hare Intl

Mon 11/10

11:24 am-10:58 pm

1 stop10h 34m

$143

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 9/25

6:38 pm-12:10 am

1 stop6h 32m

Chicago O'Hare Intl

Sat 9/27

12:22 pm-10:47 pm

1 stop9h 25m

$143

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 10/16

7:15 pm-12:11 am

1 stop5h 56m

Chicago O'Hare Intl

Mon 10/20

12:28 pm-10:59 pm

1 stop9h 31m

$143

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

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

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

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

Currently, August is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $245). Flying from Raleigh 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 RDU to IL?

Find hourly flight availability from Raleigh 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 18, 2025.

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

Weekly flight availability from Raleigh to Illinois

Explore weekly flight availability from Raleigh 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 18, 2025.

The most flights from RDU to USIL are scheduled on a Monday (31 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 18, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Raleigh to Illinois. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Overall

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
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Overall

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.
Delta
8.0
Very good
7,981 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Overall

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
8,925 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Overall

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
4,246 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Overall

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
3,212 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Boarding

8.1

Overall

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 Raleigh to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Raleigh to Illinois?

    Most people fly from Raleigh-Durham (RDU) if they book a flight from Raleigh to Illinois. Raleigh-Durham is conveniently located just 11.1 mi from Raleigh’s city center.

  • How long is the flight from Raleigh to Illinois?

    There are many flights that can get you from Raleigh to Illinois in 1h 55m. Fly via United Airlines, Southwest, or Frontier to get the fastest option. Raleigh and Illinois are separated by a distance of 631 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Raleigh to Illinois?

    The most popular route from Raleigh to Illinois is Raleigh-Durham - Chicago O'Hare Intl. You may also consider Raleigh-Durham - Chicago Midway or Raleigh-Durham - Lambert-St Louis.

  • What are the most reliable airlines from Raleigh to Illinois?

    No one likes to see their flight delayed. When booking a flight from Raleigh to Illinois consider choosing SWISS (88%), Japan Airlines (86%) or Cathay Pacific (85%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Raleigh to Illinois?

    Looking at all options, your cheapest flight can be booked for $88. While the most popular route (Raleigh-Durham - Chicago O'Hare Intl) can be booked for $120 on average our data indicates $809 when flying from Raleigh to Illinois.

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

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

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

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

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

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

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

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Alternative routes for Raleigh to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Raleigh to Illinois

Discover the top 6 airlines that operate flights from Raleigh 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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$70Average$191FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$98Average$279FlexibilityNo cancel feeOn-time65%
DeltaCheapest$98Average$302FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$157Average$359FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$157Average$386FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$178Average$314FlexibilityNo cancel feeOn-time63%

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