$121+ Cheap flights from Illinois to San Luis Obispo (SBP)
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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SBP
Feb 7 — Feb 141
1 adult, Economy
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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 Illinois to San Luis Obispo
Keep the following information in mind while searching for Illinois to San Luis Obispo flight deals. Data was last updated January 8, 2026.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $279 (Alaska Airlines) |
One-way from | $121 (Expedia) |
Popular in | February |
Cheapest in | January |
Average price | $298 |
Find flight deals from Illinois to San Luis Obispo
Cheapest flights from Illinois to San Luis ObispoExplore the most affordable flight options available from Illinois to San Luis Obispo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 8, 2026.
Explore the most affordable flight options available from Illinois to San Luis Obispo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 8, 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.
Sat 2/285:29 pmORD - SBP
1 stop27h 24mAlaska Airlines
Wed 3/47:33 pmSBP - ORD
1 stop16h 38mAlaska Airlines
Deal found 1/6![Alaska Airlines logo]()
$279
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.
Wed 4/227:00 amSTL - SBP
2 stops18h 19mAlaska Airlines
Wed 4/296:00 amSBP - STL
2 stops15h 59mAlaska Airlines
Deal found 1/7![Alaska Airlines logo]()
$284
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.
Thu 4/306:00 amORD - SBP
2 stops19h 19mAlaska Airlines
Sun 5/36:00 amSBP - ORD
1 stop6h 41mAlaska Airlines
Deal found 1/7![Alaska Airlines logo]()
$286
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 2/143:07 pmORD - SBP
1 stop10h 10mAlaska Airlines
Sun 2/226:00 amSBP - ORD
1 stop15h 59mAlaska Airlines
Deal found 1/7![Alaska Airlines logo]()
$323
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.
Thu 5/143:43 pmORD - SBP
1 stop9h 45mAlaska Airlines
Sun 5/176:00 amSBP - ORD
1 stop15h 41mAlaska Airlines
Deal found 1/7![Alaska Airlines logo]()
$328
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.
Thu 1/298:00 amORD - SBP
2 stops17h 20mAlaska Airlines
Sun 2/15:14 pmSBP - ORD
2 stops21h 56mAlaska Airlines
Deal found 1/7![Alaska Airlines logo]()
$338
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/219:00 amORD - SBP
1 stop9h 34mAlaska Airlines
Tue 1/275:14 pmSBP - ORD
2 stops21h 56mAlaska Airlines
Deal found 1/6![Alaska Airlines logo]()
$341
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.
Thu 3/197:59 pmORD - SBP
1 stop20h 22mAlaska Airlines
Sat 3/287:34 pmSBP - ORD
1 stop9h 05mAlaska Airlines
Deal found 1/7![Alaska Airlines logo]()
$369
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 3/215:30 pmSTL - SBP
1 stop27h 12mAlaska Airlines
Fri 3/277:34 pmSBP - STL
1 stop26h 25mAlaska Airlines
Deal found 1/7![Alaska Airlines logo]()
$388
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/285:12 amSTL - SBP
1 stop8h 50mAmerican Airlines
Sat 4/412:45 pmSBP - STL
1 stop8h 13mAmerican Airlines
Deal found 1/7![American Airlines logo]()
$567
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.
Thu 3/122:47 pmSTL - SBP
2 stops34h 30mAlaska Airlines
Sun 3/153:47 pmSBP - STL
2 stops30h 12mAlaska Airlines
Deal found 1/7![Alaska Airlines logo]()
$592
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/125:12 amSTL - SBP
1 stop8h 50mAmerican Airlines
Sun 3/156:00 amSBP - STL
1 stop5h 51mAmerican Airlines
Deal found 1/7![American Airlines logo]()
$617
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Luis Obispo 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 8, 2026.
Use the filters below to find and compare flights from Illinois to San Luis Obispo that are best for you.
Fly from
Illinois
Fly to
San Luis Obispo
Route
Depart
Return
Price
ChicagoSan Luis Obispo
ORD - SBP
ORDSBP
Chicago O'Hare Intl
Sat 2/28
5:29 pm-6:53 pm
1 stop27h 24m
San Luis Obispo County
Wed 3/4
7:33 pm-2:11 pm
1 stop16h 38m
$279
ChicagoSan Luis Obispo
ORD - SBP
ORDSBP
Chicago O'Hare Intl
Thu 4/30
6:00 am-11:19 pm
2 stops19h 19m
San Luis Obispo County
Sun 5/3
6:00 am-2:41 pm
1 stop6h 41m
$286
St. LouisSan Luis Obispo
STL - SBP
STLSBP
Lambert-St Louis
Wed 4/22
7:00 am-11:19 pm
2 stops18h 19m
San Luis Obispo County
Wed 4/29
7:20 am-11:59 pm
1 stop14h 39m
$298
ChicagoSan Luis Obispo
ORD - SBP
ORDSBP
Chicago O'Hare Intl
Sat 2/14
3:07 pm-11:17 pm
1 stop10h 10m
San Luis Obispo County
Sun 2/22
6:00 am-11:59 pm
1 stop15h 59m
$323
ChicagoSan Luis Obispo
ORD - SBP
ORDSBP
Chicago O'Hare Intl
Thu 5/14
3:43 pm-11:28 pm
1 stop9h 45m
San Luis Obispo County
Sun 5/17
6:00 am-11:41 pm
1 stop15h 41m
$328
ChicagoSan Luis Obispo
ORD - SBP
ORDSBP
Chicago O'Hare Intl
Wed 1/21
3:44 pm-11:20 pm
1 stop9h 36m
San Luis Obispo County
Tue 1/27
6:00 am-2:29 pm
1 stop6h 29m
$348
ChicagoSan Luis Obispo
ORD - SBP
ORDSBP
Chicago O'Hare Intl
Thu 3/19
7:59 pm-2:21 pm
1 stop20h 22m
San Luis Obispo County
Sat 3/28
7:34 pm-6:39 am
1 stop9h 05m
$369
ChicagoSan Luis Obispo
ORD - SBP
ORDSBP
Chicago O'Hare Intl
Sat 2/14
5:00 am-12:03 pm
2 stops9h 03m
San Luis Obispo County
Sun 2/22
12:45 pm-10:31 pm
1 stop7h 46m
$375
St. LouisSan Luis Obispo
STL - SBP
STLSBP
Lambert-St Louis
Sat 3/21
5:30 pm-6:42 pm
1 stop27h 12m
San Luis Obispo County
Fri 3/27
7:34 pm-11:59 pm
1 stop26h 25m
$388
St. LouisSan Luis Obispo
STL - SBP
STLSBP
Lambert-St Louis
Sat 3/28
5:12 am-12:02 pm
1 stop8h 50m
San Luis Obispo County
Sat 4/4
12:45 pm-10:58 pm
1 stop8h 13m
$567
Showing 1-10 of 19 results
Best time to book a flight from Illinois to San Luis Obispo
Have a flexible travel schedule? Discover the best time to fly to San Luis Obispo from Illinois 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 Illinois to San Luis Obispo
What is the cheapest month to book a flight from Illinois to San Luis Obispo?
Currently, February is the cheapest month in which you can book a flight from Illinois to San Luis Obispo (average of $218). Flying from Illinois to San Luis Obispo in May is currently the most expensive (average of $340). 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.
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Luis Obispo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Luis Obispo?
Book flights to San Luis Obispo if you plan to visit one of these locationsMorro Bay
Arroyo Grande
Avila Beach
San Simeon
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Alternative routes for Illinois to San Luis Obispo
See prices for flight routes from nearby airports that may be better suited for you.
Top 2 airlines flying from Illinois to San Luis Obispo
Discover the top 2 airlines that operate flights from Illinois to San Luis Obispo. 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 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$247 | Average$461 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$276 | Average$544 | FlexibilityNo cancel fee | On-time69% |