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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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Raleigh to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Raleigh (RDU) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$118
(CheapOair)

One-way from

$54
(Frontier)

Popular in

December

Cheapest in

August

Average price

$299

Good round-trip deal

$348 or less

Good one-way deal

$190 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
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One-way flight from Raleigh-Durham to Illinois
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Highest demand for flights based on searches. 19% potential increase in price ($57 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in January 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 January 30, 2025.

This CheapOair deal was found by Cheapflights users on 1/29. 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.
Tue 3/41:47 pmRDU - STL
1 stop10h 56mFrontier
Wed 3/55:20 pmSTL - RDU
1 stop19h 50mFrontier
Deal found 1/29$118
This CheapOair deal was found by Cheapflights users on 1/29. 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.
Tue 2/251:47 pmRDU - STL
1 stop10h 56mMultiple Airlines
Thu 2/274:00 pmSTL - RDU
1 stop20h 12mMultiple Airlines
Deal found 1/29$142
This CheapOair deal was found by Cheapflights users on 1/30. 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.
Wed 3/59:34 pmRDU - STL
1 stop20h 08mSpirit Airlines
Sun 3/95:38 pmSTL - RDU
1 stop25h 51mSpirit Airlines
Deal found 1/30$158
This Frontier deal was found by Cheapflights users on 1/28. 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 5/18:31 pmRDU - ORD
1 stop11h 35mFrontier
Sun 5/41:01 pmORD - RDU
Nonstop2h 05mFrontier
Deal found 1/28$165
This Booking.com deal was found by Cheapflights users on 1/29. 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.
Thu 2/278:00 amRDU - MDW
1 stop15h 46mFrontier
Sun 3/24:08 pmMDW - RDU
1 stop5h 38mFrontier
Deal found 1/29$169
This CheapOair deal was found by Cheapflights users on 1/30. 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.
Wed 3/56:25 amRDU - ORD
1 stop11h 06mMultiple Airlines
Sun 3/97:42 pmORD - RDU
1 stop23h 47mMultiple Airlines
Deal found 1/30$173
This Cheapflightsfares deal was found by Cheapflights users on 1/29. 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.
Fri 2/72:26 pmRDU - ORD
1 stop10h 06mSpirit Airlines
Sun 2/165:00 amORD - RDU
1 stop7h 12mSpirit Airlines
Deal found 1/29$181
This American Airlines deal was found by Cheapflights users on 1/29. 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.
Sat 2/1510:07 amRDU - MLI
1 stop6h 44mAmerican Airlines
Wed 2/195:00 amMLI - RDU
1 stop5h 56mAmerican Airlines
Deal found 1/29$199
This Southwest deal was found by Cheapflights users on 1/29. 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.
Tue 3/117:15 pmRDU - STL
Nonstop2h 15mSouthwest
Thu 3/138:40 pmSTL - RDU
Nonstop1h 50mSouthwest
Deal found 1/29$257
This Sun Country Air deal was found by Cheapflights users on 1/29. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/266:10 pmRDU - ORD
1 stop26h 01mSun Country Air
Sun 6/298:10 pmORD - RDU
1 stop20h 01mSun Country Air
Deal found 1/29$275
This JetBlue deal was found by Cheapflights users on 1/29. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2112:25 pmRDU - ORD
1 stop7h 18mJetBlue
Wed 10/294:05 pmORD - RDU
1 stop6h 02mJetBlue
Deal found 1/29$277
This Delta deal was found by Cheapflights users on 1/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/275:30 amRDU - STL
1 stop5h 06mDelta
Mon 3/37:07 pmSTL - RDU
1 stop3h 51mDelta
Deal found 1/30$277

Find flights from Raleigh to Illinois within your budget

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 January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Tue 3/4

1:47 pm-11:43 pm

1 stop10h 56m

Lambert-St Louis

Wed 3/5

5:20 pm-2:10 pm

1 stop19h 50m

$118

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Tue 2/25

1:47 pm-11:43 pm

1 stop10h 56m

Lambert-St Louis

Thu 2/27

4:00 pm-1:12 pm

1 stop20h 12m

$142

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Wed 3/5

9:34 pm-4:42 pm

1 stop20h 08m

Lambert-St Louis

Sun 3/9

5:38 pm-8:29 pm

1 stop25h 51m

$158

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Mon 2/24

5:20 pm-12:44 am

1 stop8h 24m

Chicago O'Hare Intl

Fri 2/28

11:46 am-10:04 am

1 stop21h 18m

$165

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Fri 4/11

5:24 pm-12:42 am

1 stop8h 18m

Chicago O'Hare Intl

Sun 4/13

6:45 am-6:42 pm

1 stop10h 57m

$169

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Thu 2/27

8:00 am-10:46 pm

1 stop15h 46m

Chicago Midway

Sun 3/2

4:08 pm-10:46 pm

1 stop5h 38m

$169

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 2/27

2:17 pm-11:58 pm

1 stop10h 41m

Chicago O'Hare Intl

Fri 2/28

7:13 pm-10:04 am

2 stops13h 51m

$178

RaleighMoline

RDU - MLI

RDUMLI

Raleigh-Durham

Sat 2/15

10:07 am-3:51 pm

1 stop6h 44m

Moline Quad-City

Wed 2/19

5:00 am-11:56 am

1 stop5h 56m

$199

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Tue 3/11

7:15 pm-8:30 pm

Nonstop2h 15m

Lambert-St Louis

Thu 3/13

8:40 pm-11:30 pm

Nonstop1h 50m

$257

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Thu 2/27

5:30 am-9:36 am

1 stop5h 06m

Lambert-St Louis

Tue 3/4

5:50 pm-11:47 pm

1 stop4h 57m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 49 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.

Travel insights for flights from Raleigh to Illinois

Get recent, data-driven insights about flights from Raleigh to Illinois including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Raleigh to Illinois?

Currently, August is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $245). Flying from Raleigh to Illinois in March is currently the most expensive (average of $325). 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 January 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Raleigh to Illinois as you normally would.

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 January 30, 2025.

The most flights from RDU to USIL are scheduled on a Thursday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 January 30, 2025.
To help decide which airline to fly from Raleigh to Illinois, see what other customers have to say about Southwest, Delta and Avelo Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,454 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Avelo Airlines
7.5
Good
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

JetBlue
7.4
Good
3,156 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,913 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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.

  • 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 $54. Users have also found prices from $73 and $97 on Spirit 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 SkyWest Airlines (100%), Royal Jordanian (91%) or ANA (90%) 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 $132 on average our data indicates $982 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, August is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $245). Flying from Raleigh to Illinois in March is currently the most expensive (average of $325). 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 January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$38Average$124FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$80Average$249FlexibilityNo cancel feeOn-time65%
DeltaCheapest$102Average$362FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$137Average$336FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$143Average$388FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$158Average$313FlexibilityNo cancel feeOn-time63%
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