$283 Find Cheap Flights from San Luis Obispo to Illinois

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Luis Obispo to Illinois departing on 5/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Luis Obispo to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Luis Obispo to Illinois, as well as popular online travel agencies
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Cheap Flights from San Luis Obispo to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Peoria
Peoria1 stop$404
St. Louis
St. Louis2 stops$353
Peoria
Peoria1 stop$404
St. Louis
St. Louis2 stops$353

Book Cheap San Luis Obispo to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Luis Obispo to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Luis Obispo to Illinois

Sat, May 2 - Sat, May 9
Alaska Airlines Logo
6:00 am - 2:41 pm
SBP
-
ORD
6h 41m1 stop
Alaska Airlines Logo
8:50 am - 2:59 pm
ORD
-
SBP
8h 09m1 stop
$283Alaska Airlines
Sat, Feb 14 - Wed, Feb 18
Alaska Airlines Logo
6:00 am - 2:58 pm
SBP
-
ORD
6h 58m1 stop
Alaska Airlines Logo
8:20 am - 11:17 pm
ORD
-
SBP
16h 57m1 stop
$290Alaska Airlines
Wed, Feb 25 - Mon, Mar 2
Alaska Airlines Logo
6:00 am - 2:58 pm
SBP
-
ORD
6h 58m1 stop
Alaska Airlines Logo
3:07 pm - 11:17 pm
ORD
-
SBP
10h 10m1 stop
$292Alaska Airlines
Mon, Jan 26 - Mon, Feb 2
Alaska Airlines Logo
6:00 am - 2:29 pm
SBP
-
ORD
6h 29m1 stop
Alaska Airlines Logo
9:00 am - 4:34 pm
ORD
-
SBP
9h 34m1 stop
$302Alaska Airlines
Mon, Jan 26 - Mon, Feb 2
Alaska Airlines Logo
6:00 am - 2:29 pm
SBP
-
ORD
6h 29m1 stop
Alaska Airlines Logo
3:35 pm - 4:55 pm
ORD
-
SBP
27h 20m2 stops
$308Alaska Airlines
Tue, May 12 - Sat, May 16
Alaska Airlines Logo
3:39 pm - 6:40 am
SBP
-
ORD
13h 01m2 stops
Alaska Airlines Logo
9:00 am - 2:00 pm
ORD
-
SBP
7h 00m1 stop
$318Alaska Airlines
Sat, May 2 - Sat, May 9
Alaska Airlines Logo
5:36 pm - 1:23 pm
SBP
-
ORD
17h 47m1 stop
Alaska Airlines Logo
8:50 am - 2:59 pm
ORD
-
SBP
8h 09m1 stop
$319Alaska Airlines
Fri, Jan 30 - Sun, Feb 1
Alaska Airlines Logo
3:12 pm - 11:37 pm
SBP
-
ORD
6h 25m1 stop
Alaska Airlines Logo
3:44 pm - 4:34 pm
ORD
-
SBP
26h 50m1 stop
$323Alaska Airlines
Wed, Jan 21 - Sat, Jan 24
United Airlines Logo
12:30 pm - 8:47 pm
SBP
-
PIA
6h 17m1 stop
United Airlines Logo
10:45 am - 7:44 pm
PIA
-
SBP
10h 59m2 stops
$404United Airlines
Wed, Jan 21 - Sat, Jan 24
United Airlines Logo
6:05 am - 4:43 pm
SBP
-
PIA
8h 38m2 stops
United Airlines Logo
10:45 am - 9:15 pm
PIA
-
SBP
12h 30m2 stops
$409United Airlines
Booking Insights

KAYAK's insights & trends for San Luis Obispo to Illinois flights

Get data-powered insights and trends into flights from San Luis Obispo to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from San Luis Obispo to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Luis Obispo to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Luis Obispo to Illinois is August, when tickets cost $317 (return) on average. On the other hand, the most expensive months are March and November, when the average cost of round-trip tickets is $883 and $613 respectively.

Good to know

Low seasonDecember
Cheapest flight$283
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly and prices are also 20% lower on average.
Flight from San Luis Obispo to Chicago

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from San Luis Obispo to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Luis Obispo to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Luis Obispo to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from San Luis Obispo to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Luis Obispo to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from San Luis Obispo to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Luis Obispo to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from San Luis Obispo to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from San Luis Obispo to Illinois

 
See real verified KAYAK customer reviews for airlines flying from San Luis Obispo to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Luis Obispo to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9121 reviews
7.1Entertainment
8.1Crew
7.7Boarding
7.3Comfort
6.6Food
Airline reviews

They did the one thing that really matters - got to Chicago early.

10.0 ExcellentRob, Dec 2025
RIC - ORD
Read more United Airlines reviews

They did the one thing that really matters - got to Chicago early.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Very bad! They kept delaying my flight and wouldn’t do anything about it

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

It was a typical flight. We had a delay which seems to be the normality now. And we had no in flight service due to conditions.

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

Terrible. Flight delayed for more than 8 hours with only a $12 meal voucher provided for the inconvenience. The airplane did not have breaks on arrival yet they still made us go through the motions and board on time knowing we could not take off then sit for 40+ minutes before having to get of the time. A complete waste of my time. I cannot believe they can stay business with these shenanigans. I’ll avoid this company like the plague moving forward as the lack of accountability is disgraceful.

This was the best 2 flights I have had with American out of SGF. Great crew both flights.

Excellent - explanations were clear staff was nice and flight was comfortable

Lost bag and 2 days no word leaving for cruise no clothes or stuff

Everything you need to know for your flight from San Luis Obispo to Illinois

Information on your arrival and departure airports