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$139+ Cheap flights from San Luis Obispo (SBP) 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 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
SBP — ORD
Dec 20 — Dec 271
Sat 12/20
Sat 12/27
1 adult, Economy
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Find flight deals from San Luis Obispo to Illinois

Cheapest flights from San Luis Obispo to Illinois
Explore the most affordable flight options available from San Luis Obispo to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 20, 2025.

This American Airlines deal was found by Cheapflights users on 11/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/267:07 pmSBP - ORD
1 stop8h 27mAmerican Airlines
Wed 12/315:00 amORD - SBP
1 stop6h 23mAmerican Airlines
Deal found 11/18$352
This American Airlines deal was found by Cheapflights users on 11/19. 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.
Mon 12/226:54 pmSBP - ORD
1 stop8h 40mAmerican Airlines
Wed 12/315:00 amORD - SBP
1 stop6h 23mAmerican Airlines
Deal found 11/19$373
This American Airlines deal was found by Cheapflights users on 11/19. 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.
Tue 12/234:30 pmSBP - ORD
1 stop5h 46mAmerican Airlines
Wed 12/315:00 amORD - SBP
1 stop6h 23mAmerican Airlines
Deal found 11/19$400
This American Airlines deal was found by Cheapflights users on 11/19. 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 12/3112:36 pmSBP - ORD
1 stop7h 43mAmerican Airlines
Sat 1/35:00 amORD - SBP
1 stop6h 23mAmerican Airlines
Deal found 11/19$415
This American Airlines deal was found by Cheapflights users on 11/19. 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 12/277:07 pmSBP - ORD
1 stop8h 27mAmerican Airlines
Sat 1/35:00 amORD - SBP
1 stop6h 23mAmerican Airlines
Deal found 11/19$424
This Alaska Airlines deal was found by Cheapflights users on 11/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:51 pmSBP - ORD
1 stop8h 30mAlaska Airlines
Sun 12/78:59 pmORD - SBP
1 stop21h 08mAlaska Airlines
Deal found 11/18$441
This American Airlines deal was found by Cheapflights users on 11/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/31:08 pmSBP - ORD
2 stops8h 27mAmerican Airlines
Sun 12/712:10 pmORD - SBP
1 stop8h 19mAmerican Airlines
Deal found 11/18$447
This Alaska Airlines deal was found by Cheapflights users on 11/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/237:45 pmSBP - ORD
2 stops22h 17mAlaska Airlines
Wed 12/318:39 amORD - SBP
2 stops12h 26mAlaska Airlines
Deal found 11/19$449
This Alaska Airlines deal was found by Cheapflights users on 11/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/55:18 pmSBP - ORD
1 stop17h 51mAlaska Airlines
Sat 12/208:58 pmORD - SBP
1 stop21h 42mAlaska Airlines
Deal found 11/19$459
This Alaska Airlines deal was found by Cheapflights users on 11/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/227:45 pmSBP - ORD
2 stops22h 17mAlaska Airlines
Wed 12/313:37 pmORD - SBP
1 stop9h 58mAlaska Airlines
Deal found 11/19$461
This American Airlines deal was found by Cheapflights users on 11/19. 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.
Mon 12/226:54 pmSBP - ORD
1 stop8h 40mAmerican Airlines
Tue 12/305:00 amORD - SBP
1 stop6h 23mAmerican Airlines
Deal found 11/19$478

Cheap flight deals from San Luis Obispo to Illinois

Keep the following information in mind while searching for San Luis Obispo to Illinois flight deals. Data was last updated November 20, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$279
(United Airlines)

One-way from

$139
(American Airlines)

Popular in

March

Cheapest in

August

Average price

$613
Provider with most accurate pricing for San Luis Obispo County-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Luis Obispo County-Chicago (CHI) flights.
Search Deals
From San Luis Obispo County to Illinois
Search Deals
One-way flight from San Luis Obispo County to Illinois
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Luis Obispo 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 November 20, 2025.
Use the filters below to find and compare flights from San Luis Obispo to Illinois that are best for you.

Fly from

San Luis Obispo

Fly to

Illinois

Route

Depart

Return

Price

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Tue 1/6

1:42 pm-10:59 pm

1 stop7h 17m

Chicago O'Hare Intl

Tue 1/13

2:40 pm-7:43 pm

1 stop7h 03m

$279

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Tue 1/6

4:18 pm-12:23 am

1 stop6h 05m

Chicago O'Hare Intl

Tue 1/13

10:19 am-6:30 pm

2 stops10h 11m

$284

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Fri 2/20

12:19 pm-11:59 pm

1 stop9h 40m

Chicago O'Hare Intl

Tue 2/24

3:07 pm-11:17 pm

1 stop10h 10m

$290

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Fri 12/26

7:07 pm-5:34 am

1 stop8h 27m

Chicago O'Hare Intl

Wed 12/31

5:00 am-9:23 am

1 stop6h 23m

$352

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Mon 12/22

6:54 pm-5:34 am

1 stop8h 40m

Chicago O'Hare Intl

Wed 12/31

5:00 am-9:23 am

1 stop6h 23m

$373

San Luis ObispoPeoria

SBP - PIA

SBPPIA

San Luis Obispo County

Fri 1/9

12:30 pm-8:47 pm

1 stop6h 17m

Greater Peoria

Tue 1/13

8:35 am-1:30 pm

1 stop6h 55m

$379

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Fri 2/20

10:02 am-5:48 pm

1 stop5h 46m

Chicago O'Hare Intl

Tue 2/24

8:25 am-4:07 pm

2 stops9h 42m

$384

San Luis ObispoPeoria

SBP - PIA

SBPPIA

San Luis Obispo County

Fri 1/9

1:03 pm-9:43 pm

1 stop6h 40m

Greater Peoria

Tue 1/13

7:38 am-3:39 pm

2 stops10h 01m

$384

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Sat 4/25

6:00 am-1:59 pm

1 stop5h 59m

Chicago O'Hare Intl

Fri 5/1

7:55 pm-1:47 pm

1 stop19h 52m

$404

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Wed 12/10

4:18 pm-12:31 am

1 stop6h 13m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 15 results
1
2

Best time to book a flight from San Luis Obispo to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from San Luis Obispo 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 San Luis Obispo to Illinois

What is the cheapest month to book a flight from San Luis Obispo to Illinois?

Currently, February is the cheapest month in which you can book a flight from San Luis Obispo to Illinois (average of $218). Flying from San Luis Obispo to Illinois in November is currently the most expensive (average of $388). 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 SBP to IL?

Find hourly flight availability from San Luis Obispo 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 November 20, 2025.

One of the essential ways to save on airfare from San Luis Obispo to Illinois is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 21% on airfare.

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 November 20, 2025.
Read reviews from past customers who have flown United Airlines and American Airlines from San Luis Obispo to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,028 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
9,028 reviews
United Airlines
7.4
Good
9,028 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
American Airlines
7.2
Good
11,047 reviews
United Airlines
7.4
Good
9,028 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

Find useful and relevant information for your journey from San Luis Obispo 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 San Luis Obispo to Illinois?

    Most people fly from San Luis Obispo County (SBP) if they book a flight from San Luis Obispo to Illinois. San Luis Obispo County is conveniently located just 3.3 mi from San Luis Obispo’s city center.

  • How long is the flight from San Luis Obispo to Illinois?

    For as low as $284, United Airlines can have you in Illinois from San Luis Obispo in 6h 05m. Airlines will cover a distance of 1814 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • Can I find deals for flights from San Luis Obispo to Illinois that include hotel bookings?

    Yes. In addition to deals on San Luis Obispo to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Luis Obispo to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Luis Obispo to Illinois.

  • Can I find deals for business class flights from San Luis Obispo to Illinois?

    Yes. Cheapflights offers flight deals from San Luis Obispo 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 San Luis Obispo to Illinois?

    Currently, February is the cheapest month in which you can book a flight from San Luis Obispo to Illinois (average of $218). Flying from San Luis Obispo to Illinois in November is currently the most expensive (average of $388). 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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Top 2 airlines flying from San Luis Obispo to Illinois

Discover the top 2 airlines that operate flights from San Luis Obispo 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 November 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$274Average$468FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$362Average$620FlexibilityNo cancel feeOn-time69%

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