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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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
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 November 13, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$110
(Frontier)

One-way from

$55
(Priceline)

Popular in

March

Cheapest in

August

Average price

$273

Good round-trip deal

$225 or less

Good one-way deal

$112 or less
Provider with most accurate pricing for Raleigh-Durham-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Raleigh-Durham-Chicago (CHI) flights.
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From Raleigh-Durham to Illinois
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One-way flight from Raleigh-Durham to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($58 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 November 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 November 13, 2025.

This Frontier deal was found by Cheapflights users on 11/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/86:10 amRDU - STL
1 stop4h 42mFrontier
Thu 12/1112:04 pmSTL - RDU
1 stop11h 08mFrontier
Deal found 11/11$110
This CheapOair deal was found by Cheapflights users on 11/12. 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 12/111:03 pmRDU - ORD
1 stop5h 24mFrontier
Sun 12/143:47 pmORD - RDU
1 stop25h 46mFrontier
Deal found 11/12$124
This Frontier deal was found by Cheapflights users on 11/12. 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 12/111:03 pmRDU - MDW
1 stop6h 05mFrontier
Sun 12/146:15 amMDW - RDU
1 stop4h 53mFrontier
Deal found 11/12$124
This Expedia deal was found by Cheapflights users on 11/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:00 amRDU - STL
1 stop6h 07mFrontier
Fri 12/53:30 pmSTL - RDU
1 stop24h 14mFrontier
Deal found 11/11$124
This Super.com deal was found by Cheapflights users on 11/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:15 pmRDU - ORD
1 stop5h 53mFrontier
Wed 12/34:01 pmORD - RDU
1 stop7h 11mFrontier
Deal found 11/11$126
This Super.com deal was found by Cheapflights users on 11/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/111:03 pmRDU - MDW
1 stop6h 05mFrontier
Thu 12/186:12 amMDW - RDU
1 stop4h 48mFrontier
Deal found 11/11$126
This Kiwi.com deal was found by Cheapflights users on 11/12. 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 12/111:03 pmRDU - ORD
1 stop5h 24mFrontier
Sat 12/136:11 amORD - RDU
1 stop17h 01mFrontier
Deal found 11/12$127
This Frontier deal was found by Cheapflights users on 11/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1512:55 pmRDU - MDW
1 stop10h 17mFrontier
Mon 12/226:12 amMDW - RDU
1 stop5h 08mFrontier
Deal found 11/10$127
This Expedia deal was found by Cheapflights users on 11/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/17:37 pmRDU - STL
1 stop27h 56mFrontier
Thu 12/412:04 pmSTL - RDU
1 stop11h 08mFrontier
Deal found 11/11$127
This CheapOair deal was found by Cheapflights users on 11/11. 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.
Fri 12/511:13 amRDU - MDW
1 stop9h 29mFrontier
Thu 12/118:05 amMDW - RDU
1 stop10h 04mFrontier
Deal found 11/11$128
This CheapOair deal was found by Cheapflights users on 11/13. 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 11/244:05 pmRDU - ORD
Nonstop2h 25mFrontier
Mon 12/16:15 pmORD - RDU
1 stop21h 29mFrontier
Deal found 11/13$130
This Kiwi.com deal was found by Cheapflights users on 11/12. 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 12/17:15 pmRDU - MDW
1 stop15h 02mFrontier
Wed 12/32:49 pmMDW - RDU
1 stop8h 23mFrontier
Deal found 11/12$130

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 November 13, 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 - MDW

RDUMDW

Raleigh-Durham

Mon 11/24

6:10 am-9:55 am

1 stop4h 45m

Chicago Midway

Thu 11/27

1:30 pm-4:15 pm

Nonstop1h 45m

$149

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Wed 1/28

7:10 am-12:05 pm

1 stop5h 55m

Chicago Midway

Sun 2/1

5:01 pm-12:11 am

1 stop6h 10m

$160

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Fri 1/16

3:22 pm-6:51 am

1 stop16h 29m

Lambert-St Louis

Mon 1/19

5:11 pm-1:59 pm

1 stop19h 48m

$161

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Wed 12/10

5:26 pm-6:55 pm

Nonstop2h 29m

Chicago O'Hare Intl

Fri 12/12

11:04 am-2:07 pm

Nonstop2h 03m

$168

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Wed 12/10

5:30 am-6:30 am

Nonstop2h 00m

Chicago Midway

Fri 12/12

7:30 pm-10:20 pm

Nonstop1h 50m

$168

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Tue 12/9

6:30 pm-7:35 pm

Nonstop2h 05m

Chicago Midway

Sun 12/14

9:45 am-12:40 pm

Nonstop1h 55m

$168

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Mon 12/8

6:10 am-10:33 pm

2 stops17h 23m

Lambert-St Louis

Thu 12/11

12:04 pm-10:16 am

1 stop21h 12m

$170

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Tue 12/9

8:15 am-10:33 pm

2 stops15h 18m

Lambert-St Louis

Thu 12/11

12:04 pm-10:16 am

1 stop21h 12m

$170

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 2/5

1:29 pm-2:55 pm

Nonstop2h 26m

Chicago O'Hare Intl

Sun 2/8

6:35 pm-9:46 pm

Nonstop2h 11m

$177

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Wed 12/10

8:15 am-11:55 am

1 stop4h 40m

Chicago Midway

Sat 12/13

11:05 am-4:47 pm

1 stop4h 42m

$178

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

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, November is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $93). Flying from Raleigh to Illinois in March is currently the most expensive (average of $199). 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 November 13, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 44% on flights from Raleigh to Illinois by exploring options for tickets in the evening.

What is the cheapest day to fly from Raleigh to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Raleigh to Illinois. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Raleigh to Illinois flight should consider departing on Wednesday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 November 13, 2025.

The most flights from RDU to USIL are scheduled on a Thursday (33 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 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 November 13, 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
4,242 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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
7.9
Good
8,007 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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
9,017 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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
11,051 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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
3,109 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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 29m. Fly via Southwest, Frontier, or United Airlines to get the fastest option. Raleigh and Illinois are separated by a distance of 645 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 $68. Users have also found prices from $70 and $70 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 Emirates (96%), Cathay Pacific (90%) or ANA (87%) 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 $69. While the most popular route (Raleigh-Durham - Chicago O'Hare Intl) can be booked for $114 on average, our data indicates $856 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, November is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $93). Flying from Raleigh to Illinois in March is currently the most expensive (average of $199). 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 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$79Average$188FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$352FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$114Average$279FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$168Average$352FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$172Average$397FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$177Average$317FlexibilityNo cancel feeOn-time63%

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