$187 Find Cheap Flights from San Luis Obispo to Illinois

This is the cheapest one-way 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 9/11. 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.
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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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Best Illinois Flight Deals from San Luis Obispo

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Peoria
Peoria1 stop$379
St. Louis
St. Louis1 stop$359
Peoria
Peoria1 stop$379
St. Louis
St. Louis1 stop$359

Cheap Flight Deals from San Luis Obispo to Illinois (SBP-USIL)

 
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.

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

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from San Luis Obispo to Illinois.
Discover the best prices for you by selecting your travel dates on KAYAK.
American Airlines Logo
4:35 pm - 12:32 amSBP-ORD
5h 57m1 stop
American Airlines Logo
3:35 pm - 10:35 pmORD-SBP
9h 00m1 stop
$367American Airlines
Find Deal
Sat, Jun 14 - Thu, Jun 19
American Airlines Logo
4:36 pm - 12:32 amSBP-ORD
5h 56m1 stop
American Airlines Logo
3:52 pm - 10:35 pmORD-SBP
8h 43m2 stops
$372American Airlines
Find Deal
Tue, Jun 17 - Tue, Jun 24
American Airlines Logo
12:15 pm - 11:46 pmSBP-ORD
9h 31m1 stop
American Airlines Logo
5:00 am - 11:54 amORD-SBP
8h 54m1 stop
$375American Airlines
Find Deal
Wed, Jul 9 - Mon, Jul 14
American Airlines Logo
12:15 pm - 11:07 pmSBP-PIA
8h 52m1 stop
American Airlines Logo
6:48 am - 11:20 amPIA-SBP
6h 32m1 stop
$379American Airlines
Find Deal
Thu, Jul 10 - Wed, Jul 16
United Airlines Logo
6:00 pm - 10:19 amSBP-PIA
14h 19m2 stops
United Airlines Logo
5:25 pm - 11:59 pmPIA-SBP
8h 34m2 stops
$389United Airlines
Find Deal
Tue, Jul 8 - Mon, Jul 14
Alaska Airlines Logo
6:00 am - 8:50 pmSBP-ORD
12h 50m2 stops
Alaska Airlines Logo
10:00 am - 6:22 pmORD-SBP
10h 22m1 stop
$394Alaska Airlines
Find Deal
Fri, Oct 24 - Mon, Oct 27
Alaska Airlines Logo
7:35 pm - 5:40 amSBP-ORD
8h 05m1 stop
Alaska Airlines Logo
6:00 am - 6:43 pmORD-SBP
14h 43m1 stop
$395Alaska Airlines
Find Deal
Tue, Jul 8 - Tue, Jul 15
Alaska Airlines Logo
7:35 pm - 5:40 amSBP-ORD
8h 05m1 stop
Alaska Airlines Logo
7:00 am - 6:43 pmORD-SBP
13h 43m2 stops
$400Alaska Airlines
Find Deal
Tue, Jul 8 - Tue, Jul 15
United Airlines Logo
6:00 am - 8:56 pmSBP-PIA
12h 56m2 stops
United Airlines Logo
3:39 pm - 11:59 pmPIA-SBP
10h 20m2 stops
$473United Airlines
Find Deal
Fri, Jul 11 - Wed, Jul 16
United Airlines Logo
6:00 pm - 10:19 amSBP-PIA
14h 19m2 stops
United Airlines Logo
5:25 pm - 11:59 pmPIA-SBP
8h 34m2 stops
$483United Airlines
Find Deal
Sat, Jul 12 - Mon, Jul 14
Useful Info

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 February, when tickets cost $375 (return) on average. On the other hand, the most expensive months are March and July, when the average cost of round-trip tickets is $883 and $826 respectively.

What’s the cheapest day of the week to fly from San Luis Obispo to Illinois?

The average price of all round-trip flights from San Luis Obispo to Illinois clicked on KAYAK for each day over the last 12 months.

When flying from San Luis Obispo to Illinois, you should consider leaving on a Tuesday and avoid Sundays if you are looking for the best rates. For your return to San Luis Obispo, you’ll find the best rates on Thursdays and the most expensive ones on Sundays.

How far in advance should I book a flight from San Luis Obispo to Illinois?

To calculate weekly average prices, KAYAK takes all prices for each week before departure 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 average of all the values for each week.

To get a below average price on the flight from San Luis Obispo to Illinois, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.


Good to know

Low seasonMarch
High seasonApril
Cheapest flight$187
Best time to beat the crowds but there is an average 20% increase in price.
Most popular time to fly and prices are also 26% 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.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $500 on average. Morning departures are around 20% more expensive than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $688.

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 8701 reviews
6.6Food
8.1Crew
7.1Entertainment
7.7Boarding
7.3Comfort
Airline reviews

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

10.0 ExcellentDr. Joseph, Apr 2025IAH - ORD
Read more United Airlines reviews

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

Overall poor for me I paid extra for seats with leg room and my regional flights exit row seats have less leg room then the others that's money that could have been saved and on my final flight home the flights air was not operating it was unbearably hot in the cabin I will be contacting United and filing a DOT complaint

There's just no way to sit fully upright and comfortably in these seats. There needs to be 2 more inches of room, and that's not something that only one person on the flight needs - the whole flight needs 2 more inches of room. If that means you sell 6 less seats, so be it. It's too close for anyone. Forcing people to pay for "premium" economy just to get "barely enough space to breathe" isn't really an answer to that.

The crew were very nice. The Chocolate is good and v there’s no entertainment. Thanks

The crew were very nice. I would have appreciated a pillow for comfort. I had a special meal that was sloppy, but the salad was great. Thanks

The plane was in Moline all night. Consequently, we assumed an on time departure at 8:15am. Unfortunately, and as is the normal case with United in Moline, we departed 2.5 hours late. When the crew came, it was discovered that there was very little heat in the plane. Seems this should have been checked hours before the crew arrived. Then when we boarded and the plane was to be de-iced, the United de-icing truck was not working! We awaited the American Airlines truck. All of this caused us to miss our connection in Chicago. My suggestion is never take United Airlines flight from Moline. We have been disappointed 80% of the time and have vowed to not take United again from Moline.

Flight was delayed two hours. No snacks and no tv screens. My bag got stuck in Chicago

The aircrew was solid, the flight was chill, I had no issues. The gate agent was not the best. I was trying to use a military bag upgrade to move my bag from under the seat to the overhead bins and he told me there’s no overhead bins on the plane, argued with me why booking put a military member in basic economy (I don’t really understand this) and made it an issue to even try to help me stating I’d have to call reservations to get a bag upgrade. When every other agent with United can add it at the gate, this man couldn’t be bothered.

They canceled our flight and left us stranded to figure it out

Everything was very good. Was able to change a make run flight leaving on direct earlier in the app -seamless!!! Well done

To start, I’d like to say that every American Airline personnel I interacted with on the ground, especially flight crew, was very friendly and did their best to help me out. Despite this, however, my experience with the airline was an entire mess. The 7:19 PM flight was heavily delayed due to weather, and pushed to 10:30 AM the next morning. Because of this, I had to spend the night inside of the airport. At some point later in the night, I got an email saying that the flight had been canceled. I called the support number, and the representative on the other line told me that the flight was still on and that I didn’t need to rebook. The next morning, no one came to the gate to open the door for the crew until almost 11 AM. By this time the flight crew had been waiting for over an hour, and they had called management to get someone to open the door for them multiple times. Around 11:30, the gate screen had changed to a different flight. I ended up buying a last minute ticket with Southwest airline just to get to Chicago, because the next flight with American wasn’t until 7:19 pm that day. Now, earlier that morning my suitcase had been sent ahead of me to ORD. I went to baggage claim to ask them if I could have my suitcase forwarded to where I was staying. The representative at SDF baggage claim said they could and put the claim in for me. As I was going back through TSA, I got an email that the airline had found my suitcase, but the next step was to send it BACK to SDF. I called the airline support number again, and I made it clear that my suitcase needed to stay in Chicago and to not come back to SDF. The representative told me that they would hold my suitcase at ORD and that it wasn’t going to be forwarded anywhere. Once I got there, I found that they had loaded my suitcase onto a plane to send it back to SDF. Thankfully, I had gotten to the baggage claim counter in time for them to put in a request to bring my suitcase back up. My refund with the airline is processing already, but because of this entire experience and miscommunication at every turn of the way, I will not book with American Airlines in the future.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

Crew professional. Easy bag drop off. On time. Good entertainment.

Everything was great. Boarding, early departure, early arrival, and deplaning were smooth. Smooth flight.

Per usual, flight status, staff courtesy and professionalism were excellent

Everything was on time, we arrived early, everything worked well.

The only thing is if Wi-Fi is available after you land and taxi to the gate. It takes forever to get to the gate, and having the Wi-Fi continue would be great to bide the time at least 5 minutes before you arrive at the entrance. That is my only comment; otherwise, everything was good.

Had to wait on pilot and crew to depart and had to wait to arrive at the gate because they only had 2 crews working. Delays, delays....Planes just keep getting smaller and tighter and they nickle and dime for everything. When will an airline actually wake up and make flying more enjoyable?

Seating was horrible. Small seats. Access to flight information and extras very iser unfriendly. Kept losing internet after paying for it. Staff in madison was as unprofessional and unhelpful.

Delayed due to no crew. On a major holiday travel day.

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