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Illinois

$65+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
apr. 22 — apr. 291
ons. 4/22
ons. 4/29
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 marts 23, 2026.

This Expedia deal was found by Cheapflights users on 3/22. 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.
tor. 4/166:10 am
RDU
-
STL
1 stop5h 20m
Frontier
ons. 4/228:23 pm
STL
-
RDU
1 stop11h 00m
Frontier
Deal found 3/22$140
This CheapOair deal was found by Cheapflights users on 3/22. 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.
fre. 4/248:48 pm
RDU
-
STL
1 stop27h 31m
Frontier
man. 4/274:59 pm
STL
-
RDU
1 stop22h 57m
Frontier
Deal found 3/22$151
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
fre. 5/13:49 pm
RDU
-
STL
1 stop16h 01m
Frontier
man. 5/48:23 pm
STL
-
RDU
1 stop14h 36m
Frontier
Deal found 3/18$155
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
ons. 4/154:00 pm
RDU
-
STL
1 stop19h 30m
Frontier
fre. 4/178:23 pm
STL
-
RDU
1 stop11h 43m
Frontier
Deal found 3/18$158
This Expedia deal was found by Cheapflights users on 3/20. 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.
tor. 4/97:33 pm
RDU
-
STL
1 stop13h 18m
Frontier
man. 4/138:19 pm
STL
-
RDU
1 stop20h 43m
Frontier
Deal found 3/20$160
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
tor. 4/166:10 am
RDU
-
ORD
2 stops12h 01m
Multiple Airlines
søn. 4/191:12 pm
ORD
-
RDU
Nonstop2h 07m
Multiple Airlines
Deal found 3/18$163
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
tir. 4/73:57 pm
RDU
-
MDW
1 stop7h 22m
Frontier
ons. 4/86:00 am
MDW
-
RDU
1 stop8h 02m
Frontier
Deal found 3/18$163
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
tir. 4/73:57 pm
RDU
-
ORD
1 stop7h 42m
Multiple Airlines
tir. 4/147:17 am
ORD
-
RDU
1 stop10h 27m
Multiple Airlines
Deal found 3/18$164
This Kiwi.com deal was found by Cheapflights users on 3/20. 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.
tor. 4/163:42 pm
RDU
-
MDW
1 stop7h 37m
Frontier
søn. 4/196:00 am
MDW
-
RDU
1 stop25h 46m
Frontier
Deal found 3/20$164
This CheapOair deal was found by Cheapflights users on 3/20. 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.
fre. 4/2410:03 pm
RDU
-
ORD
Nonstop2h 19m
Frontier
søn. 4/263:57 pm
ORD
-
RDU
1 stop15h 21m
Frontier
Deal found 3/20$165
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
fre. 4/246:10 am
RDU
-
MDW
1 stop17h 16m
Frontier
man. 4/276:00 am
MDW
-
RDU
1 stop16h 25m
Frontier
Deal found 3/18$165
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
man. 4/206:10 am
RDU
-
ORD
1 stop5h 13m
Multiple Airlines
tor. 4/2311:28 am
ORD
-
RDU
1 stop11h 15m
Multiple Airlines
Deal found 3/18$166

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 marts 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Expedia)

One-way from

$65
(Trip.com)

Popular in

February

Cheapest in

December

Average price

$309

Good round-trip deal

$297 or less

Good one-way deal

$148 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. 15% potential increase in price ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 marts 23, 2026.
Use the filters below to find and compare flights from Raleigh to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

fre. 5/8

12:33 pm-7:55 am

1 stop20h 22m

Chicago O'Hare Intl

man. 5/11

4:05 pm-2:12 pm

1 stop21h 07m

$167

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

tor. 4/30

3:42 pm-10:39 pm

1 stop7h 57m

Chicago O'Hare Intl

søn. 5/3

2:10 pm-5:17 pm

Nonstop2h 07m

$185

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

ons. 5/20

5:40 am-8:45 am

1 stop4h 05m

Chicago O'Hare Intl

tir. 5/26

7:07 am-3:10 pm

1 stop7h 03m

$237

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

fre. 5/15

8:14 pm-9:54 pm

Nonstop2h 40m

Chicago O'Hare Intl

man. 5/18

6:05 pm-9:13 pm

Nonstop2h 08m

$237

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

lør. 5/9

8:00 am-9:00 am

Nonstop2h 00m

Chicago Midway

ons. 5/13

1:55 pm-9:40 pm

1 stop6h 45m

$237
Quickest round-trip

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

fre. 5/1

7:45 pm-8:45 pm

Nonstop2h 00m

Chicago Midway

man. 5/4

2:40 pm-5:30 pm

Nonstop1h 50m

$237

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

tor. 4/30

7:45 pm-10:45 pm

1 stop4h 00m

Chicago Midway

søn. 5/3

9:50 pm-12:45 am

Nonstop1h 55m

$237

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

fre. 5/15

4:25 pm-9:00 pm

1 stop5h 35m

Chicago Midway

man. 5/18

2:40 pm-5:30 pm

Nonstop1h 50m

$247

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

tor. 6/4

7:55 pm-11:00 pm

1 stop4h 05m

Chicago Midway

lør. 6/6

6:15 pm-9:10 pm

Nonstop1h 55m

$256

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

man. 5/4

6:10 am-1:15 pm

1 stop8h 05m

Chicago O'Hare Intl

man. 5/11

2:40 pm-11:10 pm

2 stops7h 30m

$262

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/22

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $49). Flying from Raleigh to Illinois in April is currently the most expensive (average of $154). 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 marts 23, 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 27% 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 March 14, 2026.

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 marts 23, 2026.

The most flights from RDU to USIL are scheduled on a Monday (33 on average). You will have fewer flight options on Saturday, 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 marts 23, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited 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
4,324 reviews

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,324 reviews
Southwest
8.0
Very good
4,324 reviews

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,319 reviews
Southwest
8.0
Very good
4,324 reviews

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,462 reviews
Southwest
8.0
Very good
4,324 reviews

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,489 reviews
Southwest
8.0
Very good
4,324 reviews

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.7
Fair
3,019 reviews
Southwest
8.0
Very good
4,324 reviews

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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. Fly via Frontier, Delta, 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 $74 and $80 on American Airlines and JetBlue, 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 Royal Jordanian (85%), Emirates (83%) or SWISS (80%) 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 $95. While the most popular route (Raleigh-Durham - Chicago O'Hare Intl) can be booked for $139 on average, our data indicates $826 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 $49). Flying from Raleigh to Illinois in April is currently the most expensive (average of $154). 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 marts 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$191FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$277FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$146Average$319FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$160Average$293FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$170Average$432FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$177Average$303FlexibilityNo cancel feeOn-time63%

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