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$46+ 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
ene. 11 — ene. 181
dom. 1/11
dom. 1/18
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 diciembre 12, 2025.

This Mytrip deal was found by Cheapflights users on 12/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/168:15 amRDU - ORD
1 stop7h 57mFrontier
mié. 12/174:01 pmORD - RDU
1 stop7h 11mFrontier
Deal found 12/9$162
This Expedia deal was found by Cheapflights users on 12/11. 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.
mié. 12/311:05 pmRDU - ORD
1 stop10h 19mFrontier
lun. 1/512:39 pmORD - RDU
1 stop10h 34mFrontier
Deal found 12/11$163
This Expedia deal was found by Cheapflights users on 12/11. 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.
mié. 12/311:05 pmRDU - MDW
1 stop10h 07mFrontier
lun. 1/56:12 amMDW - RDU
1 stop5h 08mFrontier
Deal found 12/11$163
This Expedia deal was found by Cheapflights users on 12/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/302:12 pmRDU - ORD
1 stop21h 06mFrontier
dom. 1/46:10 amORD - RDU
Nonstop2h 05mFrontier
Deal found 12/10$166
This Southwest deal was found by Cheapflights users on 12/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/255:30 amRDU - MDW
Nonstop2h 00mSouthwest
jue. 12/256:05 pmMDW - RDU
Nonstop1h 50mSouthwest
Deal found 12/9$177
This CheapOair deal was found by Cheapflights users on 12/11. 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.
mar. 12/168:15 amRDU - ORD
1 stop11h 31mFrontier
mar. 1/202:53 pmORD - RDU
1 stop7h 58mFrontier
Deal found 12/11$182
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/311:05 pmRDU - ORD
1 stop10h 19mMultiple Airlines
lun. 1/512:09 pmORD - RDU
2 stops35h 03mMultiple Airlines
Deal found 12/11$184
This Frontier deal was found by Cheapflights users on 12/10. 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.
mié. 12/311:05 pmRDU - ORD
1 stop10h 19mFrontier
jue. 1/16:00 amORD - RDU
1 stop5h 00mFrontier
Deal found 12/10$188
This Expedia deal was found by Cheapflights users on 12/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/258:14 pmRDU - ORD
1 stop13h 38mFrontier
dom. 1/115:35 amORD - RDU
Nonstop2h 05mFrontier
Deal found 12/10$193
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/302:12 pmRDU - ORD
1 stop21h 06mFrontier
jue. 1/16:00 amORD - RDU
1 stop5h 00mFrontier
Deal found 12/10$194
This American Airlines deal was found by Cheapflights users on 12/9. 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.
jue. 12/256:00 amRDU - ORD
Nonstop2h 30mAmerican Airlines
jue. 12/251:38 pmORD - RDU
Nonstop2h 11mAmerican Airlines
Deal found 12/9$202
This Booking.com deal was found by Cheapflights users on 12/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/3111:48 amRDU - STL
1 stop11h 45mFrontier
dom. 1/44:27 pmSTL - RDU
1 stop23h 30mFrontier
Deal found 12/9$210

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 diciembre 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$110
(Kiwi.com)

One-way from

$46
(Kiwi.com)

Popular in

March

Cheapest in

August

Average price

$257

Good round-trip deal

$271 or less

Good one-way deal

$115 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. 19% potential increase in price ($66 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 diciembre 12, 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

mié. 1/28

2:15 pm-11:33 pm

1 stop10h 18m

Lambert-St Louis

vie. 1/30

5:42 pm-9:47 am

1 stop15h 05m

$128

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

dom. 1/11

3:50 pm-8:18 am

1 stop17h 28m

Chicago O'Hare Intl

mar. 1/13

8:08 pm-10:43 pm

2 stops25h 35m

$146

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

vie. 1/9

10:00 am-5:43 pm

1 stop8h 43m

Chicago O'Hare Intl

lun. 1/12

6:45 am-1:44 pm

1 stop5h 59m

$161

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

jue. 1/1

6:00 am-9:40 am

1 stop4h 40m

Lambert-St Louis

jue. 1/8

3:43 pm-12:12 am

1 stop7h 29m

$163

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

jue. 1/15

10:11 pm-7:54 am

1 stop10h 43m

Lambert-St Louis

sáb. 1/17

3:43 pm-9:33 am

2 stops16h 50m

$170

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

lun. 1/5

8:14 pm-10:33 pm

1 stop27h 19m

Lambert-St Louis

mié. 1/7

7:43 pm-6:41 pm

1 stop21h 58m

$174

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

jue. 1/22

9:36 pm-10:23 am

1 stop13h 47m

Lambert-St Louis

dom. 1/25

5:42 pm-2:13 pm

2 stops19h 31m

$184

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

jue. 12/25

8:15 am-11:25 am

1 stop4h 10m

Chicago Midway

jue. 12/25

6:05 pm-8:55 pm

Nonstop1h 50m

$187

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

lun. 1/5

9:37 pm-10:33 pm

1 stop25h 56m

Lambert-St Louis

vie. 1/9

3:43 pm-12:12 am

1 stop7h 29m

$218

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

mar. 12/16

8:15 am-3:12 pm

1 stop7h 57m

Chicago O'Hare Intl

dom. 12/21

6:10 am-9:15 am

Nonstop2h 05m

$224

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

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 $61). 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 diciembre 12, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 40% 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. Sunday evenings 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 diciembre 12, 2025.

The most flights from RDU to USIL are scheduled on a Thursday (32 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 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 diciembre 12, 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
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

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
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

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
8,008 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

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
9,095 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

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
11,050 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

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
3,084 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

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 4h 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%), Royal Jordanian (86%) or ANA (84%) 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 $121 on average, our data indicates $814 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 $61). 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.

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Alternative routes for Raleigh to Illinois

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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 diciembre 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$76Average$187FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$81Average$184FlexibilityNo cancel feeOn-time65%
DeltaCheapest$98Average$317FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$162Average$344FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$173Average$403FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$177Average$314FlexibilityNo cancel feeOn-time63%

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