$89+ 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 5/29. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Illinois to San Diego 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 Illinois to San Diego
Keep the following information in mind while searching for Illinois to San Diego flight deals. Data was last updated abril 30, 2025.
Most accurate provider | Mytrip 3 stars |
|---|---|
Most trusted provider | Mytrip 3 stars |
Round-trip from | $186 (Cheapflightsfares) |
One-way from | $89 (Frontier) |
Popular in | March |
Cheapest in | February |
Average price | $387 |
Good round-trip deal | $251 or less |
Good one-way deal | $158 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 abril 30, 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 abril 30, 2025.
This FlightHub deal was found by Cheapflights users on 4/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This FlightHub deal was found by Cheapflights users on 4/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This FlightHub deal was found by Cheapflights users on 4/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Cheapflightsfares deal was found by Cheapflights users on 4/29. 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.
This Southwest deal was found by Cheapflights users on 4/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This American Airlines deal was found by Cheapflights users on 4/29. 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.
This United Airlines deal was found by Cheapflights users on 4/29. 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.
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Frontier deal was found by Cheapflights users on 4/29. 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.
This Southwest deal was found by Cheapflights users on 4/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 4/28. 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.
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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.
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 abril 30, 2025.
Use the filters below to find and compare flights from Illinois to San Diego that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
vie. 5/16
8:14 pm-11:19 pm
1 stop29h 05m
San Diego
dom. 5/18
6:25 am-5:10 am
1 stop20h 45m
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
vie. 5/30
10:00 am-11:56 pm
2 stops15h 56m
San Diego
mar. 6/3
8:48 pm-10:55 am
1 stop12h 07m
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
dom. 5/11
5:45 am-10:56 am
1 stop7h 11m
San Diego
dom. 5/18
5:43 pm-8:55 am
2 stops13h 12m
ChicagoSan Diego
MDW - SAN
MDWSAN
Chicago Midway
lun. 5/12
8:03 pm-12:13 am
1 stop6h 10m
San Diego
mié. 5/14
1:23 pm-7:08 pm
1 stop27h 45m
ChicagoSan Diego
MDW - SAN
MDWSAN
Chicago Midway
sáb. 6/7
7:25 am-9:40 am
Nonstop4h 15m
San Diego
mié. 6/11
6:55 pm-12:50 am
Nonstop3h 55m
MolineSan Diego
MLI - SAN
MLISAN
Moline Quad-City
sáb. 5/31
5:00 am-1:38 pm
1 stop10h 38m
San Diego
mar. 6/3
12:43 pm-9:24 pm
1 stop6h 41m
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
lun. 6/9
4:20 pm-6:42 pm
Nonstop4h 22m
San Diego
mar. 6/17
5:00 pm-11:15 pm
Nonstop4h 15m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
lun. 6/16
1:30 pm-9:19 pm
1 stop9h 49m
San Diego
lun. 6/23
10:30 pm-9:43 am
1 stop9h 13m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
lun. 5/26
2:25 pm-6:26 pm
1 stop6h 01m
San Diego
vie. 5/30
7:19 pm-10:09 am
1 stop12h 50m
MolineSan Diego
MLI - SAN
MLISAN
Moline Quad-City
jue. 6/5
5:35 pm-10:14 pm
1 stop6h 39m
San Diego
sáb. 6/7
9:30 pm-10:20 am
2 stops10h 50m
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.
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 abril 30, 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 abril 30, 2025.
The most flights from USIL to SAN are scheduled on a Tuesday (40 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 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 abril 30, 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.
Food
Comfort
Boarding
Entertainment
Overall
Crew
Reviews
James,Apr 2025
LAX - SFO
Food
Comfort
Boarding
Entertainment
Overall
Crew
Reviews
James,Apr 2025
LAX - SFO
Food
Comfort
Boarding
Entertainment
Overall
Crew
Reviews
James,Apr 2025
LAX - SFO
Food
Comfort
Boarding
Entertainment
Overall
Crew
Reviews
James,Apr 2025
LAX - SFO
Food
Comfort
Boarding
Entertainment
Overall
Crew
Reviews
James,Apr 2025
LAX - SFO
Food
Comfort
Boarding
Entertainment
Overall
Crew
Reviews
James,Apr 2025
LAX - SFO
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?
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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 abril 30, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$102 | Average$216 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$108 | Average$201 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$144 | Average$413 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$204 | Average$475 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$217 | Average$433 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$253 | Average$462 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$403 | Average$653 | FlexibilityNo cancel fee | On-time75% |