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$54+ 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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Nov 9 — Nov 161
Sun 11/9
Sun 11/16
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 October 10, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$108
(Frontier)

One-way from

$54
(Frontier)

Popular in

March

Cheapest in

August

Average price

$231

Good round-trip deal

$244 or less

Good one-way deal

$120 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
Search Deals
One-way flight from Raleigh-Durham to Illinois
Search Deals
Highest demand for flights based on searches. 17% 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 October 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 October 10, 2025.

This Frontier deal was found by Cheapflights users on 10/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/66:00 amRDU - STL
1 stop12h 27mFrontier
Thu 11/1311:07 amSTL - RDU
1 stop5h 55mFrontier
Deal found 10/9$108
This CheapOair deal was found by Cheapflights users on 10/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:10 amRDU - ORD
1 stop5h 31mFrontier
Sun 11/25:25 amORD - RDU
1 stop26h 18mFrontier
Deal found 10/9$129
This CheapOair deal was found by Cheapflights users on 10/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/17:12 pmRDU - MDW
1 stop16h 00mFrontier
Sun 11/26:06 pmMDW - RDU
1 stop22h 36mFrontier
Deal found 10/9$129
This Kiwi.com deal was found by Cheapflights users on 10/9. 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.
Mon 10/202:27 pmRDU - ORD
Nonstop2h 22mFrontier
Tue 10/213:12 pmORD - RDU
1 stop23h 25mFrontier
Deal found 10/9$130
This Kiwi.com deal was found by Cheapflights users on 10/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/42:54 pmRDU - MDW
1 stop10h 01mFrontier
Tue 11/111:56 pmMDW - RDU
1 stop26h 12mFrontier
Deal found 10/7$130
This Frontier deal was found by Cheapflights users on 10/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/65:51 pmRDU - ORD
1 stop6h 50mFrontier
Sun 11/96:00 amORD - RDU
1 stop9h 36mFrontier
Deal found 10/9$131
This CheapOair deal was found by Cheapflights users on 10/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/187:51 pmRDU - MDW
1 stop21h 51mFrontier
Thu 10/238:25 amMDW - RDU
1 stop4h 16mFrontier
Deal found 10/9$131
This Mytrip deal was found by Cheapflights users on 10/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/710:06 pmRDU - ORD
Nonstop2h 22mFrontier
Sun 11/96:00 amORD - RDU
1 stop9h 36mFrontier
Deal found 10/7$132
This Kiwi.com deal was found by Cheapflights users on 10/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/67:00 amRDU - MDW
1 stop17h 05mFrontier
Tue 12/98:00 amMDW - RDU
1 stop13h 07mFrontier
Deal found 10/8$133
This American Airlines deal was found by Cheapflights users on 10/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:00 amRDU - ORD
Nonstop2h 25mAmerican Airlines
Wed 11/129:21 amORD - RDU
Nonstop2h 10mAmerican Airlines
Deal found 10/9$134
This CheapOair deal was found by Cheapflights users on 10/9. 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 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 11/25:25 amORD - RDU
1 stop26h 18mFrontier
Deal found 10/9$136
This Kiwi.com deal was found by Cheapflights users on 10/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/273:15 pmRDU - ORD
1 stop19h 58mMultiple Airlines
Wed 10/296:40 amORD - RDU
1 stop24h 34mMultiple Airlines
Deal found 10/8$137

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 October 10, 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 11/8

10:00 am-11:25 am

Nonstop2h 25m

Chicago O'Hare Intl

Sat 11/15

7:10 am-10:14 am

Nonstop2h 04m

$139

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Thu 12/25

3:25 pm-9:05 pm

1 stop6h 40m

Chicago Midway

Thu 1/1

6:05 pm-8:55 pm

Nonstop1h 50m

$149

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Fri 11/14

11:39 am-10:26 am

1 stop23h 47m

Chicago Midway

Sun 11/16

10:12 am-8:43 am

1 stop21h 31m

$150

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 11/1

4:49 pm-6:18 pm

Nonstop2h 29m

Chicago O'Hare Intl

Tue 11/4

6:40 pm-9:49 pm

Nonstop2h 09m

$159

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Sat 11/1

6:35 am-7:30 am

Nonstop1h 55m

Chicago Midway

Tue 11/4

6:05 pm-8:55 pm

Nonstop1h 50m

$159

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 10/25

10:30 am-6:33 pm

1 stop9h 03m

Chicago O'Hare Intl

Sun 10/26

8:14 am-9:35 am

1 stop24h 21m

$164

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Wed 11/5

1:30 pm-2:55 pm

Nonstop2h 25m

Chicago O'Hare Intl

Mon 11/10

6:40 pm-9:49 pm

Nonstop2h 09m

$168

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Wed 11/19

6:10 am-11:14 am

1 stop6h 04m

Chicago O'Hare Intl

Fri 11/21

12:17 pm-3:20 pm

Nonstop2h 03m

$169

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Fri 11/7

5:45 am-6:50 am

Nonstop2h 05m

Chicago Midway

Mon 11/10

9:45 am-12:40 pm

Nonstop1h 55m

$177

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Fri 10/31

6:25 am-7:20 am

Nonstop1h 55m

Chicago Midway

Mon 11/3

10:00 am-1:00 pm

Nonstop2h 00m

$178

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/8

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 $79). 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 October 10, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 43% 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 October 10, 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 (21 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 October 10, 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
4,237 reviews

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

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
4,237 reviews
Southwest
8.0
Very good
4,237 reviews

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

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
7,969 reviews
Southwest
8.0
Very good
4,237 reviews

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

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
8,968 reviews
Southwest
8.0
Very good
4,237 reviews

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

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
11,043 reviews
Southwest
8.0
Very good
4,237 reviews

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

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
3,143 reviews
Southwest
8.0
Very good
4,237 reviews

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

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 25m. Fly via United Airlines, Southwest, or Frontier 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 United Airlines. According to our data, you can fly for as low as $70. Users have also found prices from $70 and $75 on Southwest and Frontier, 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 ANA (88%), SWISS (87%) 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 $58. While the most popular route (Raleigh-Durham - Chicago O'Hare Intl) can be booked for $114 on average, our data indicates $670 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 $79). 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 October 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$77Average$187FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$356FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$114Average$279FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$169Average$335FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$171Average$393FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$180Average$320FlexibilityNo cancel feeOn-time63%

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