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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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
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 6, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$110
(Expedia)

One-way from

$55
(Priceline)

Popular in

March

Cheapest in

August

Average price

$256

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.
Search Deals
Provider most trusted by Cheapflights users for Raleigh-Durham-Chicago (CHI) flights.
Search Deals
From Raleigh-Durham to Illinois
Search Deals
One-way flight from Raleigh-Durham to Illinois
Search Deals
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 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 6, 2025.

This Expedia deal was found by Cheapflights users on 11/5. 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 12/88:14 pmRDU - STL
1 stop27h 19mFrontier
Wed 12/103:30 pmSTL - RDU
1 stop18h 01mFrontier
Deal found 11/5$110
This Booking.com deal was found by Cheapflights users on 11/4. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/188:00 amRDU - STL
1 stop27h 05mFrontier
Wed 11/197:24 pmSTL - RDU
1 stop12h 00mFrontier
Deal found 11/4$121
This Expedia deal was found by Cheapflights users on 11/3. 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
Sun 12/79:54 amSTL - RDU
1 stop21h 29mFrontier
Deal found 11/3$124
This Mytrip deal was found by Cheapflights users on 11/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/201:58 pmRDU - ORD
Nonstop2h 25mFrontier
Mon 11/245:30 amORD - RDU
1 stop7h 35mFrontier
Deal found 11/4$126
This Frontier deal was found by Cheapflights users on 11/4. 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 11/207:15 pmRDU - ORD
1 stop5h 53mFrontier
Fri 11/217:00 amORD - RDU
1 stop8h 31mFrontier
Deal found 11/4$127
This Frontier deal was found by Cheapflights users on 11/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/219:11 amRDU - MDW
1 stop11h 20mFrontier
Tue 12/92:49 pmMDW - RDU
1 stop8h 23mFrontier
Deal found 11/6$127
This Priceline deal was found by Cheapflights users on 11/6. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/206:00 amRDU - STL
1 stop9h 29mFrontier
Tue 11/258:07 amSTL - RDU
1 stop5h 24mFrontier
Deal found 11/6$127
This CheapOair deal was found by Cheapflights users on 11/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/111:03 pmRDU - ORD
1 stop10h 21mFrontier
Sat 12/131:24 pmORD - RDU
1 stop9h 48mFrontier
Deal found 11/6$128
This Frontier deal was found by Cheapflights users on 11/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/209:11 amRDU - MDW
1 stop11h 20mFrontier
Wed 12/172:49 pmMDW - RDU
1 stop8h 23mFrontier
Deal found 11/6$128
This Frontier deal was found by Cheapflights users on 11/4. 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 11/1710:06 pmRDU - ORD
Nonstop2h 22mFrontier
Sat 11/2212:17 pmORD - RDU
Nonstop2h 03mFrontier
Deal found 11/4$129
This Mytrip deal was found by Cheapflights users on 11/6. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/38:14 pmRDU - MDW
1 stop26h 44mFrontier
Sat 12/62:59 pmMDW - RDU
1 stop22h 10mFrontier
Deal found 11/6$129
This Trip.com deal was found by Cheapflights users on 11/4. 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 12/2512:55 pmRDU - ORD
1 stop10h 29mFrontier
Tue 12/301:14 pmORD - RDU
Nonstop2h 05mFrontier
Deal found 11/4$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 6, 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

Sat 12/6

5:45 am-1:59 pm

1 stop9h 14m

Chicago Midway

Sun 12/7

8:05 am-8:28 pm

1 stop11h 23m

$142

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 12/6

5:26 pm-6:55 pm

Nonstop2h 29m

Chicago O'Hare Intl

Mon 12/8

7:10 am-10:14 am

Nonstop2h 04m

$158

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Fri 12/12

5:45 am-6:50 am

Nonstop2h 05m

Chicago Midway

Tue 12/16

1:45 pm-4:30 pm

Nonstop1h 45m

$158

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Thu 11/20

6:00 am-2:29 pm

1 stop9h 29m

Lambert-St Louis

Sun 11/23

4:13 pm-8:24 am

1 stop15h 11m

$161

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 12/4

5:26 pm-6:55 pm

Nonstop2h 29m

Chicago O'Hare Intl

Mon 12/8

6:12 pm-9:21 pm

Nonstop2h 09m

$177

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Thu 1/15

6:20 pm-7:25 pm

Nonstop2h 05m

Chicago Midway

Mon 1/19

6:05 pm-8:55 pm

Nonstop1h 50m

$177

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 1/31

6:15 am-7:44 am

Nonstop2h 29m

Chicago O'Hare Intl

Thu 2/5

2:02 pm-5:04 pm

Nonstop2h 02m

$177

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Fri 1/30

6:00 am-7:15 am

Nonstop2h 15m

Chicago Midway

Mon 2/2

1:25 pm-4:15 pm

Nonstop1h 50m

$177

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Tue 12/16

1:13 pm-7:29 pm

1 stop7h 16m

Lambert-St Louis

Tue 1/6

7:00 am-2:04 pm

1 stop6h 04m

$179

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 12/11

9:57 am-1:50 pm

1 stop4h 53m

Chicago O'Hare Intl

Sat 12/13

10:45 am-5:40 pm

1 stop5h 55m

$187

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/4

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, October is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $83). 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 6, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 41% 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 6, 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 (19 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 6, 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
4,241 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

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
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

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
7.9
Good
8,001 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

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
9,007 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

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
11,040 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

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
3,115 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

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 Frontier, United Airlines, or Southwest 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 $55. 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, October is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $83). 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.

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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 6, 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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