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$55+ 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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$129
(CheapOair)

One-way from

$55
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$213

Good round-trip deal

$209 or less

Good one-way deal

$136 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 ($61 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 September 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 September 11, 2025.

This CheapOair deal was found by Cheapflights users on 9/11. 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 10/23:35 pmRDU - ORD
Nonstop2h 16mFrontier
Sat 10/45:40 pmORD - RDU
1 stop4h 55mFrontier
Deal found 9/11$129
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:30 pmRDU - MDW
Nonstop2h 00mSouthwest
Wed 10/296:05 pmMDW - RDU
Nonstop1h 50mSouthwest
Deal found 9/8$129
This Priceline deal was found by Cheapflights users on 9/10. 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.
Thu 10/169:44 pmRDU - ORD
Nonstop2h 22mMultiple Airlines
Sun 10/195:05 amORD - RDU
1 stop8h 15mMultiple Airlines
Deal found 9/10$131
This CheapOair deal was found by Cheapflights users on 9/10. 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 10/242:27 pmRDU - ORD
Nonstop2h 22mFrontier
Sun 11/21:50 pmORD - RDU
Nonstop2h 06mFrontier
Deal found 9/10$132
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:10 amRDU - STL
1 stop5h 02mFrontier
Sun 11/167:02 pmSTL - RDU
1 stop27h 53mFrontier
Deal found 9/9$132
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/226:15 amRDU - ORD
Nonstop2h 23mUnited Airlines
Fri 10/246:20 pmORD - RDU
Nonstop2h 23mUnited Airlines
Deal found 9/11$133
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:30 pmRDU - MDW
Nonstop2h 00mSouthwest
Thu 10/309:45 amMDW - RDU
Nonstop1h 50mSouthwest
Deal found 9/9$133
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/86:30 pmRDU - MDW
Nonstop2h 00mSouthwest
Wed 10/1510:10 amMDW - RDU
Nonstop1h 50mSouthwest
Deal found 9/8$134
This American Airlines deal was found by Cheapflights users on 9/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/46:08 pmRDU - ORD
Nonstop2h 28mAmerican Airlines
Mon 10/68:45 pmORD - RDU
Nonstop2h 08mAmerican Airlines
Deal found 9/10$135
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Tue 12/27:00 amRDU - MDW
1 stop15h 32mFrontier
Thu 12/46:00 amMDW - RDU
1 stop16h 33mFrontier
Deal found 9/10$135
This CheapOair deal was found by Cheapflights users on 9/11. 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 10/169:44 pmRDU - ORD
Nonstop2h 22mFrontier
Sun 10/191:14 pmORD - RDU
1 stop6h 35mFrontier
Deal found 9/11$136
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/237:15 pmRDU - MDW
1 stop5h 31mFrontier
Thu 10/306:20 amMDW - RDU
1 stop10h 42mFrontier
Deal found 9/9$136

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 September 11, 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

Mon 10/6

6:15 am-7:38 am

Nonstop2h 23m

Chicago O'Hare Intl

Wed 10/8

6:20 pm-9:43 pm

Nonstop2h 23m

$133

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Sun 11/9

5:45 am-6:50 am

Nonstop2h 05m

Chicago Midway

Tue 11/11

1:40 pm-4:25 pm

Nonstop1h 45m

$133

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sun 10/12

6:15 am-7:38 am

Nonstop2h 23m

Chicago O'Hare Intl

Wed 10/15

7:15 am-10:26 am

Nonstop2h 11m

$133

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 10/23

10:00 am-11:23 am

Nonstop2h 23m

Chicago O'Hare Intl

Sat 10/25

7:10 am-10:28 am

Nonstop2h 18m

$133

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sun 11/9

6:30 am-7:56 am

Nonstop2h 26m

Chicago O'Hare Intl

Tue 11/11

11:05 am-2:08 pm

Nonstop2h 03m

$133

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Wed 10/22

6:15 am-7:38 am

Nonstop2h 23m

Chicago O'Hare Intl

Wed 10/29

11:05 am-2:08 pm

Nonstop2h 03m

$139

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 10/25

1:11 pm-2:34 pm

Nonstop2h 23m

Chicago O'Hare Intl

Sun 10/26

7:00 am-2:08 pm

1 stop6h 08m

$143

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Thu 10/2

6:22 am-3:58 pm

1 stop10h 36m

Chicago Midway

Sun 10/5

6:21 am-5:11 pm

1 stop9h 50m

$144

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Wed 10/1

6:45 am-3:58 pm

1 stop10h 13m

Chicago Midway

Sun 10/5

6:21 am-5:11 pm

1 stop9h 50m

$154

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Mon 12/8

6:00 am-11:50 am

1 stop6h 50m

Chicago O'Hare Intl

Fri 12/12

7:10 am-10:14 am

Nonstop2h 04m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

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 September 11, 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 September 11, 2025.

The most flights from RDU to USIL are scheduled on a Thursday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 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 September 11, 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
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 2h 05m. 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 cheapest airlines to fly from Raleigh to Illinois one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $78. Users have also found prices from $85 and $88 on United Airlines and Southwest, respectively.

  • 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 (92%), ANA (85%) or Japan Airlines (84%) 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 $77. While the most popular route (Raleigh-Durham - Chicago O'Hare Intl) can be booked for $117 on average, our data indicates $888 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$74Average$185FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$98Average$279FlexibilityNo cancel feeOn-time65%
DeltaCheapest$98Average$357FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$167Average$370FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$168Average$384FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$181Average$319FlexibilityNo cancel feeOn-time63%

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