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$60+ 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
1 adult, Economy
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Cheap 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 December 28, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/305:24 pmRDU - ORD
Nonstop2h 28mFrontier
Mon 1/125:35 amORD - RDU
Nonstop2h 05mFrontier
Deal found 12/27$196
This Cheapflightsfares deal was found by Cheapflights users on 12/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/305:50 pmRDU - ORD
1 stop7h 40mSpirit Airlines
Mon 1/127:20 amORD - RDU
1 stop5h 53mSpirit Airlines
Deal found 12/27$235
This Cheapflightsfares deal was found by Cheapflights users on 12/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/305:24 pmRDU - ORD
Nonstop2h 28mFrontier
Mon 1/56:00 amORD - RDU
1 stop5h 20mFrontier
Deal found 12/26$249
This Frontier deal was found by Cheapflights users on 12/26. 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.
Sun 12/2810:10 amRDU - ORD
Nonstop2h 28mFrontier
Thu 1/84:49 pmORD - RDU
1 stop6h 23mFrontier
Deal found 12/26$250
This Cheapflightsfares deal was found by Cheapflights users on 12/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/305:50 pmRDU - ORD
1 stop7h 40mSpirit Airlines
Sun 1/115:15 amORD - RDU
1 stop7h 58mSpirit Airlines
Deal found 12/27$254
This CheapOair deal was found by Cheapflights users on 12/26. 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 12/297:36 pmRDU - ORD
1 stop29h 36mFrontier
Sun 1/187:45 amORD - RDU
Nonstop2h 03mFrontier
Deal found 12/26$255
This Frontier deal was found by Cheapflights users on 12/26. 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.
Tue 12/305:24 pmRDU - ORD
Nonstop2h 28mFrontier
Sun 1/114:49 pmORD - RDU
1 stop6h 23mFrontier
Deal found 12/26$264
This Expedia deal was found by Cheapflights users on 12/26. 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.
Tue 12/305:50 pmRDU - ORD
1 stop7h 40mMultiple Airlines
Mon 1/52:15 pmORD - RDU
1 stop5h 37mMultiple Airlines
Deal found 12/26$279
This Frontier deal was found by Cheapflights users on 12/26. 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.
Tue 12/301:05 pmRDU - MDW
1 stop10h 07mFrontier
Wed 1/1411:39 amMDW - RDU
1 stop10h 04mFrontier
Deal found 12/26$302
This Frontier deal was found by Cheapflights users on 12/26. 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 12/291:15 pmRDU - MDW
1 stop9h 57mFrontier
Thu 1/812:41 pmMDW - RDU
1 stop10h 31mFrontier
Deal found 12/26$323
This Frontier deal was found by Cheapflights users on 12/26. 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.
Tue 12/302:12 pmRDU - MDW
1 stop8h 46mFrontier
Sun 1/1112:41 pmMDW - RDU
1 stop10h 31mFrontier
Deal found 12/26$337
This Frontier deal was found by Cheapflights users on 12/26. 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.
Sat 12/275:55 amRDU - MDW
1 stop8h 26mFrontier
Thu 1/812:41 pmMDW - RDU
1 stop10h 31mFrontier
Deal found 12/26$343

Find flight deals from Raleigh to Illinois

Keep the following information in mind while searching for Raleigh to Illinois flight deals. Data was last updated December 28, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$124
(Priceline)

One-way from

$60
(Trip.com)

Popular in

March

Cheapest in

August

Average price

$257

Good round-trip deal

$294 or less

Good one-way deal

$131 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. 20% potential increase in price ($68 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Raleigh-Durham to Illinois.
Search Deals
Price to beat on a one-way flight from Raleigh-Durham to Illinois.
Search Deals

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 December 28, 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

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Thu 1/22

9:36 pm-10:23 am

1 stop13h 47m

Lambert-St Louis

Mon 1/26

5:42 pm-1:59 pm

1 stop19h 17m

$152

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 1/17

7:47 pm-6:25 pm

1 stop23h 38m

Chicago O'Hare Intl

Sat 1/24

7:20 am-11:56 pm

2 stops15h 36m

$159

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Thu 1/22

6:10 am-11:33 pm

2 stops18h 23m

Lambert-St Louis

Mon 1/26

5:42 pm-1:59 pm

1 stop19h 17m

$185

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 3/7

6:15 am-11:58 am

1 stop6h 43m

Chicago O'Hare Intl

Wed 3/11

6:04 am-2:45 pm

1 stop7h 41m

$191

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Fri 3/6

6:15 am-11:49 am

1 stop6h 34m

Chicago O'Hare Intl

Mon 3/9

6:04 am-2:45 pm

1 stop7h 41m

$191

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Sat 1/17

6:15 am-7:25 am

Nonstop2h 10m

Chicago Midway

Sun 1/18

10:15 am-5:20 pm

2 stops6h 05m

$192

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Sun 2/1

9:56 pm-9:21 am

1 stop12h 25m

Lambert-St Louis

Mon 2/9

10:16 am-9:01 pm

1 stop9h 45m

$197

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Fri 2/6

5:22 pm-11:33 pm

1 stop7h 11m

Lambert-St Louis

Sun 2/8

5:42 pm-6:01 pm

2 stops23h 19m

$204

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Wed 2/11

6:15 am-7:44 am

Nonstop2h 29m

Chicago O'Hare Intl

Sat 2/14

10:42 am-1:44 pm

Nonstop2h 02m

$210

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Fri 2/6

6:10 am-10:19 pm

1 stop17h 09m

Chicago Midway

Sun 2/8

1:00 pm-9:01 pm

1 stop7h 01m

$227

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

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, January is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $68). Flying from Raleigh to Illinois in March is currently the most expensive (average of $198). 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 December 28, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 30% 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 27, 2025.

Travelers seeking maximum savings on their Raleigh to Illinois flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday 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 December 28, 2025.

The most flights from RDU to USIL are scheduled on a Sunday (29 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (17 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 December 28, 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
4,256 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,256 reviews
Southwest
8.0
Very good
4,256 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,019 reviews
Southwest
8.0
Very good
4,256 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,113 reviews
Southwest
8.0
Very good
4,256 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,072 reviews
Southwest
8.0
Very good
4,256 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,065 reviews
Southwest
8.0
Very good
4,256 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 10m. Fly via Frontier, JetBlue, 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 $36. Users have also found prices from $69 and $69 on Spirit Airlines and American Airlines, 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 Cathay Pacific (87%), ANA (82%) or United Airlines (78%) 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 $116 on average, our data indicates $903 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, January is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $68). Flying from Raleigh to Illinois in March is currently the most expensive (average of $198). 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 December 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$76Average$188FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$81Average$184FlexibilityNo cancel feeOn-time65%
DeltaCheapest$98Average$307FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$161Average$338FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$173Average$409FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$177Average$314FlexibilityNo cancel feeOn-time63%

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