HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$121+ 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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
SBP — ORD
Feb 6 — Feb 131
Fri 2/6
Fri 2/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Luis Obispo to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 January 7, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$239
(Alaska Airlines)

One-way from

$121
(Alaska Airlines)

Popular in

March

Cheapest in

August

Average price

$563
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. 7% potential increase in price ($40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 7, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/6. 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.
Thu 2/53:12 pmSBP - ORD
2 stops23h 58mAlaska Airlines
Mon 2/96:06 pmORD - SBP
2 stops24h 28mAlaska Airlines
Deal found 1/6$239
This Alaska Airlines deal was found by Cheapflights users on 1/7. 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.
Sat 5/23:39 pmSBP - ORD
2 stops13h 01mAlaska Airlines
Sat 5/96:00 amORD - SBP
2 stops14h 14mAlaska Airlines
Deal found 1/7$250
This Orbitz deal was found by Cheapflights users on 1/7. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/63:12 pmSBP - ORD
2 stops21h 26mAlaska Airlines
Sun 2/88:00 amORD - SBP
2 stops17h 20mAlaska Airlines
Deal found 1/7$259
This Alaska Airlines deal was found by Cheapflights users on 1/5. 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 2/45:14 pmSBP - ORD
2 stops21h 56mAlaska Airlines
Tue 2/106:06 pmORD - SBP
2 stops24h 49mAlaska Airlines
Deal found 1/5$269
This Alaska Airlines deal was found by Cheapflights users on 1/6. 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.
Sat 2/147:33 pmSBP - ORD
1 stop26h 23mAlaska Airlines
Wed 2/188:20 amORD - SBP
1 stop29h 19mAlaska Airlines
Deal found 1/6$281
This American Airlines deal was found by Cheapflights users on 1/6. 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 5/612:56 pmSBP - PIA
1 stop8h 17mAmerican Airlines
Sat 5/1612:12 pmPIA - SBP
2 stops11h 58mAmerican Airlines
Deal found 1/6$339
This American Airlines deal was found by Cheapflights users on 1/5. 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 1/201:03 pmSBP - PIA
1 stop6h 40mAmerican Airlines
Sat 1/247:39 amPIA - SBP
2 stops12h 51mAmerican Airlines
Deal found 1/5$364
This United Airlines deal was found by Cheapflights users on 1/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/207:09 amSBP - PIA
2 stops12h 30mUnited Airlines
Sat 1/241:24 pmPIA - SBP
2 stops12h 20mUnited Airlines
Deal found 1/5$370
This United Airlines deal was found by Cheapflights users on 1/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/65:52 pmSBP - PIA
2 stops14h 10mUnited Airlines
Sat 5/162:50 pmPIA - SBP
2 stops10h 54mUnited Airlines
Deal found 1/6$435
This United Airlines deal was found by Cheapflights users on 1/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/2112:30 pmSBP - PIA
1 stop6h 17mUnited Airlines
Sat 1/241:24 pmPIA - SBP
2 stops9h 51mUnited Airlines
Deal found 1/6$454

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 January 7, 2026.
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

Sat 5/2

3:39 pm-6:40 am

2 stops13h 01m

Chicago O'Hare Intl

Sat 5/9

6:00 am-6:14 pm

2 stops14h 14m

$250

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Thu 2/5

6:17 pm-2:38 pm

1 stop18h 21m

Chicago O'Hare Intl

Mon 2/9

6:06 pm-4:34 pm

2 stops24h 28m

$254

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Fri 2/6

6:17 pm-2:38 pm

1 stop18h 21m

Chicago O'Hare Intl

Mon 2/9

6:06 pm-4:55 pm

2 stops24h 49m

$254

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Fri 2/6

3:12 pm-2:38 pm

2 stops21h 26m

Chicago O'Hare Intl

Sun 2/8

8:00 am-11:20 pm

2 stops17h 20m

$259

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Wed 2/4

5:14 pm-5:10 pm

2 stops21h 56m

Chicago O'Hare Intl

Tue 2/10

6:06 pm-4:55 pm

2 stops24h 49m

$269

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Sat 2/14

7:33 pm-11:56 pm

1 stop26h 23m

Chicago O'Hare Intl

Wed 2/18

8:20 am-11:39 am

1 stop29h 19m

$281

San Luis ObispoPeoria

SBP - PIA

SBPPIA

San Luis Obispo County

Tue 1/20

7:09 am-9:39 pm

2 stops12h 30m

Greater Peoria

Sat 1/24

1:24 pm-11:44 pm

2 stops12h 20m

$370

San Luis ObispoPeoria

SBP - PIA

SBPPIA

San Luis Obispo County

Tue 1/20

1:03 pm-9:43 pm

1 stop6h 40m

Greater Peoria

Sat 1/24

7:00 am-12:17 pm

1 stop7h 17m

$425

San Luis ObispoPeoria

SBP - PIA

SBPPIA

San Luis Obispo County

Wed 1/21

12:30 pm-8:47 pm

1 stop6h 17m

Greater Peoria

Sat 1/24

10:45 am-9:15 pm

2 stops12h 30m

$454

San Luis ObispoChicago

SBP - ORD

SBPORD

San Luis Obispo County

Tue 2/3

5:14 pm-2:38 pm

2 stops19h 24m

$121

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/7

Showing 1-10 of 18 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.

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 7, 2026.
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
9,139 reviews

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

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
9,139 reviews
United Airlines
7.4
Good
9,139 reviews

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

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
11,095 reviews
United Airlines
7.4
Good
9,139 reviews

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

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 $425, Alaska Airlines can have you in Illinois from San Luis Obispo in 6h 40m. Airlines will cover a distance of 1717 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Luis Obispo to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
San Francisco to Las Vegas flights
Los Angeles to Seattle flights
Los Angeles to Honolulu flights
Los Angeles to Newark flights
San Francisco to Ontario flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Las Vegas flights
Los Angeles to LaGuardia flights
Los Angeles to Miami flights
San Jose to Los Angeles flights
Ontario to San Francisco flights
San Francisco to Santa Ana flights
Los Angeles to Dallas/Fort Worth flights
Burbank to Las Vegas flights
San Francisco to Los Angeles flights
Santa Ana to Las Vegas flights
Los Angeles to San Francisco flights
Los Angeles to Orlando flights
Los Angeles to Fort Lauderdale flights
San Francisco to Dallas/Fort Worth flights
Los Angeles to O'Hare Intl flights
Los Angeles to Boston flights
Ontario to Seattle flights
San Francisco to Newark flights
Santa Ana to San Francisco flights
San Francisco to Honolulu flights
San Francisco to O'Hare Intl flights
Los Angeles to Salt Lake City flights
Los Angeles to Denver flights
Los Angeles to San Jose flights
San Francisco to LaGuardia flights
San Francisco to Sky Harbor Intl flights
Los Angeles to Atlanta flights
Los Angeles to Reagan-National flights
San Francisco to Seattle flights
San Francisco to Miami flights
Los Angeles to Sky Harbor Intl flights
Santa Ana to Dallas/Fort Worth flights
San Jose to Las Vegas flights
Los Angeles to Kahului flights
San Francisco to Palm Springs flights
San Francisco to San Diego flights
San Francisco to Orlando flights
Burbank to LaGuardia flights
Los Angeles to Baltimore flights
Los Angeles to Hobby flights
San Francisco to Burbank flights
Los Angeles to New Orleans flights
Sacramento to Las Vegas flights

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 January 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$274Average$437FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$362Average$576FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.