$90+ Cheap flights from Illinois to San Diego (SAN)
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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAN
Apr 6 — Apr 131
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
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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 Diego
Keep the following information in mind while searching for Illinois to San Diego flight deals. Data was last updated April 1, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $185 (Booking.com) |
One-way from | $90 (Mytrip) |
Popular in | March |
Cheapest in | April |
Average price | $366 |
Good round-trip deal | $372 or less |
Good one-way deal | $181 or less |
Find flight deals from Illinois to San Diego
Cheapest flights from Illinois to San DiegoExplore the most affordable flight options available from Illinois to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 1, 2025.
Explore the most affordable flight options available from Illinois to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 1, 2025.
This Mytrip deal was found by Cheapflights users on 3/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/287:41 amORD - SAN
1 stop25h 53mSpirit Airlines
Thu 5/16:15 amSAN - ORD
2 stops23h 25mSpirit Airlines
Deal found 3/31![Spirit Airlines logo]()
$184
This CheapOair deal was found by Cheapflights users on 4/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/121:08 pmORD - SAN
Nonstop4h 22mFrontier
Thu 7/174:15 pmSAN - ORD
Nonstop4h 16mFrontier
Deal found 4/1![Frontier logo]()
$198
This American Airlines deal was found by Cheapflights users on 3/31. 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 4/291:08 pmMLI - SAN
1 stop8h 19mAmerican Airlines
Tue 5/1311:21 amSAN - MLI
1 stop8h 03mAmerican Airlines
Deal found 3/31![American Airlines logo]()
$229
This American Airlines deal was found by Cheapflights users on 4/1. 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 4/306:33 amPIA - SAN
1 stop8h 18mAmerican Airlines
Sat 5/31:41 pmSAN - PIA
1 stop8h 15mAmerican Airlines
Deal found 4/1![American Airlines logo]()
$229
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/79:02 pmORD - SAN
1 stop12h 11mMultiple Airlines
Mon 5/128:59 pmSAN - ORD
2 stops19h 21mMultiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$232
This Cheapflightsfares deal was found by Cheapflights users on 4/1. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/18:03 pmMDW - SAN
1 stop6h 10mFrontier
Sun 5/411:56 amSAN - MDW
1 stop6h 37mFrontier
Deal found 4/1![Frontier logo]()
$235
This United Airlines deal was found by Cheapflights users on 3/31. 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.
Sat 8/2310:49 amPIA - SAN
2 stops9h 39mUnited Airlines
Sun 8/3110:50 amSAN - PIA
2 stops8h 02mUnited Airlines
Deal found 3/31![United Airlines logo]()
$239
This American Airlines deal was found by Cheapflights users on 3/30. 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 5/247:19 pmSTL - SAN
1 stop6h 24mAmerican Airlines
Tue 5/2710:49 pmSAN - STL
1 stop8h 07mAmerican Airlines
Deal found 3/30![American Airlines logo]()
$257
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/166:51 pmSTL - SAN
1 stop7h 23mFrontier
Sun 4/206:25 amSAN - STL
1 stop24h 41mFrontier
Deal found 3/31![Frontier logo]()
$260
This Alaska Airlines deal was found by Cheapflights users on 3/31. 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 4/267:13 pmORD - SAN
1 stop15h 02mAlaska Airlines
Sat 5/36:33 amSAN - ORD
1 stop10h 37mAlaska Airlines
Deal found 3/31![Alaska Airlines logo]()
$262
This Expedia deal was found by Cheapflights users on 4/1. 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.
Fri 5/26:53 pmSTL - SAN
1 stop7h 21mMultiple Airlines
Wed 5/711:54 amSAN - STL
1 stop10h 05mMultiple Airlines
Deal found 4/1![Multiple Airlines logo]()
$262
This United Airlines deal was found by Cheapflights users on 4/1. 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 4/2310:50 amMLI - SAN
1 stop7h 27mUnited Airlines
Mon 4/288:30 pmSAN - MLI
2 stops11h 42mUnited Airlines
Deal found 4/1![United Airlines logo]()
$264
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Diego 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 April 1, 2025.
Use the filters below to find and compare flights from Illinois to San Diego that are best for you.
Fly from
Illinois
Fly to
San Diego
Route
Depart
Return
Price
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Mon 4/28
7:41 am-7:34 am
1 stop25h 53m
San Diego
Mon 5/5
6:15 am-5:45 am
2 stops21h 30m
$184
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Sat 7/12
1:08 pm-3:30 pm
Nonstop4h 22m
San Diego
Thu 7/17
4:15 pm-10:31 pm
Nonstop4h 16m
$198
MolineSan Diego
MLI - SAN
MLISAN
Moline Quad-City
Tue 4/29
1:08 pm-7:27 pm
1 stop8h 19m
San Diego
Tue 5/13
11:21 am-9:24 pm
1 stop8h 03m
$229
PeoriaSan Diego
PIA - SAN
PIASAN
Greater Peoria
Wed 4/30
6:33 am-12:51 pm
1 stop8h 18m
San Diego
Sat 5/3
1:41 pm-11:56 pm
1 stop8h 15m
$229
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Wed 5/7
9:02 pm-7:13 am
1 stop12h 11m
San Diego
Mon 5/12
8:59 pm-6:20 pm
2 stops19h 21m
$232
ChicagoSan Diego
MDW - SAN
MDWSAN
Chicago Midway
Thu 5/1
8:03 pm-12:13 am
1 stop6h 10m
San Diego
Thu 5/8
10:38 am-7:08 pm
1 stop6h 30m
$235
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Sat 5/24
7:19 pm-11:43 pm
1 stop6h 24m
San Diego
Tue 5/27
10:49 pm-8:56 am
1 stop8h 07m
$257
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Wed 4/16
6:51 pm-12:14 am
1 stop7h 23m
San Diego
Sun 4/20
6:25 am-9:06 am
1 stop24h 41m
$260
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Sat 4/26
7:13 pm-8:15 am
1 stop15h 02m
San Diego
Tue 4/29
6:15 am-6:20 pm
1 stop10h 05m
$262
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Fri 5/2
6:53 pm-12:14 am
1 stop7h 21m
San Diego
Wed 5/7
11:54 am-11:59 pm
1 stop10h 05m
$262
Showing 1-10 of 60 results
Best time to book a flight from Illinois to San Diego
Have a flexible travel schedule? Discover the best time to fly to San Diego 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 Diego
What is the cheapest month to book a flight from Illinois to San Diego?
Currently, August is the cheapest month in which you can book a flight from Illinois to San Diego (average of $286). Flying from Illinois to San Diego in March is currently the most expensive (average of $366). 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 IL to SAN?
Find hourly flight availability from Illinois to San Diego. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 1, 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to San Diego as you normally would.
Weekly flight availability from Illinois to San Diego
Explore weekly flight availability from Illinois to San Diego. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 1, 2025.
The most flights from USIL to SAN are scheduled on a Tuesday (36 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 on average).
Rainfall in San Diego by month
Plan your trip to San Diego by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in San Diego ranges from 0.0 - 2.3 inches per month. February is typically the wettest month, when rainfall can reach 2.3 in. July is typically the driest time to visit San Diego when rainfall is around 0.0 in.
Temperature in San Diego by month
Plan your trip to San Diego by taking into account the average temperature totals by month.
If weather is an important factor for your trip to San Diego, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 57.2 F).
Reviews of airlines servicing San Diego
Get insights into the airlines that provide service to San Diego. 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 San Diego. Reviews last updated April 1, 2025.
To help decide which airline to fly from Illinois to San Diego, see what other customers have to say about Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.9
Crew
8.5
Entertainment
7.1
Food
7.1
Overall
8.0
Boarding
8.2
Reviews
1 / 20
10.0
ExcellentSeleste,Dec 2024
FAT - SAN
Comfort
7.9
Crew
8.5
Entertainment
7.1
Food
7.1
Overall
8.0
Boarding
8.2
Reviews
1 / 20
10.0
ExcellentSeleste,Dec 2024
FAT - SAN
Comfort
7.9
Crew
8.5
Entertainment
7.1
Food
7.1
Overall
8.0
Boarding
8.2
Reviews
1 / 20
10.0
ExcellentSeleste,Dec 2024
FAT - SAN
Comfort
7.9
Crew
8.5
Entertainment
7.1
Food
7.1
Overall
8.0
Boarding
8.2
Reviews
1 / 20
10.0
ExcellentSeleste,Dec 2024
FAT - SAN
Comfort
7.9
Crew
8.5
Entertainment
7.1
Food
7.1
Overall
8.0
Boarding
8.2
Reviews
1 / 20
10.0
ExcellentSeleste,Dec 2024
FAT - SAN
Comfort
7.9
Crew
8.5
Entertainment
7.1
Food
7.1
Overall
8.0
Boarding
8.2
Reviews
1 / 20
10.0
ExcellentSeleste,Dec 2024
FAT - SAN
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Diego. 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 Illinois?
Book flights to Illinois if you plan to visit one of these locationsEl Cajon
Chula Vista
Lemon Grove
National City
Imperial Beach
La Mesa
Alpine
Poway
Santee
Coronado
Borrego Springs
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Illinois to San Diego
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from Illinois to San Diego
Discover the top 7 airlines that operate flights from Illinois to San Diego. 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 April 1, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$219 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$108 | Average$198 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$144 | Average$403 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$201 | Average$475 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$217 | Average$448 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$252 | Average$465 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$403 | Average$704 | FlexibilityNo cancel fee | On-time75% |