$74+ Cheap flights from San Diego (SAN) to Illinois
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 4/6. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from San Diego to Illinois 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 San Diego to Illinois
Keep the following information in mind while searching for San Diego to Illinois flight deals. Data was last updated March 10, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $164 (CheapOair) |
One-way from | $74 (Cheapflightsfares) |
Popular in | December |
Cheapest in | October |
Average price | $427 |
Good round-trip deal | $389 or less |
Good one-way deal | $191 or less |
Find flight deals from San Diego to Illinois
Cheapest flights from San Diego to IllinoisExplore the most affordable flight options available from San Diego to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2025.
Explore the most affordable flight options available from San Diego to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2025.
This CheapOair deal was found by Cheapflights users on 3/9. 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.
This FlightHub deal was found by Cheapflights users on 3/10. 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 3/10. 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 Cheapflightsfares deal was found by Cheapflights users on 3/10. 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 Mytrip deal was found by Cheapflights users on 3/10. 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.
This United Airlines deal was found by Cheapflights users on 3/9. 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 3/9. 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.
This Delta deal was found by Cheapflights users on 3/9. 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 United Airlines deal was found by Cheapflights users on 3/10. 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 3/10. 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 American Airlines deal was found by Cheapflights users on 3/10. 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 Southwest deal was found by Cheapflights users on 3/9. 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.
Find flights from San Diego to Illinois within your budget
Customize your flight search to find flights from San Diego to Illinois 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 March 10, 2025.
Fly from
Fly to
Route
Depart
Return
Price
San DiegoChicago
SAN - ORD
SANORD
San Diego
Wed 5/21
8:48 pm-10:55 am
1 stop12h 07m
Chicago O'Hare Intl
Wed 5/28
6:00 am-11:59 pm
1 stop19h 59m
San DiegoChicago
SAN - ORD
SANORD
San Diego
Thu 5/8
7:31 pm-9:55 am
2 stops12h 24m
Chicago O'Hare Intl
Mon 5/12
11:50 am-7:53 pm
1 stop10h 03m
San DiegoChicago
SAN - ORD
SANORD
San Diego
Fri 4/4
9:19 pm-5:08 am
1 stop5h 49m
Chicago O'Hare Intl
Wed 4/9
6:40 am-11:29 am
1 stop6h 49m
San DiegoChicago
SAN - MDW
SANMDW
San Diego
Thu 3/27
9:46 pm-5:31 am
1 stop5h 45m
Chicago Midway
Mon 4/7
6:45 am-11:29 am
1 stop6h 44m
San DiegoChicago
SAN - RFD
SANRFD
San Diego
Thu 4/10
8:29 am-8:46 pm
1 stop10h 17m
Chicago Greater Rockford
Sun 4/13
9:36 pm-7:34 am
1 stop11h 58m
San DiegoChicago
SAN - ORD
SANORD
San Diego
Sat 5/24
5:00 pm-11:15 pm
Nonstop4h 15m
Chicago O'Hare Intl
Fri 5/30
1:15 pm-3:37 pm
Nonstop4h 22m
San DiegoChicago
SAN - ORD
SANORD
San Diego
Tue 4/29
4:20 pm-6:20 pm
1 stop24h 00m
Chicago O'Hare Intl
Tue 5/6
6:58 pm-10:05 am
1 stop17h 07m
San DiegoChicago
SAN - ORD
SANORD
San Diego
Sun 5/25
8:35 am-5:06 pm
1 stop6h 31m
Chicago O'Hare Intl
Wed 5/28
3:49 pm-9:56 pm
1 stop8h 07m
San DiegoMoline
SAN - MLI
SANMLI
San Diego
Sat 6/7
8:34 pm-10:20 am
2 stops11h 46m
Moline Quad-City
Mon 6/9
5:35 pm-10:14 pm
1 stop6h 39m
San DiegoSt. Louis
SAN - STL
SANSTL
San Diego
Mon 4/7
9:50 pm-9:36 am
1 stop9h 46m
Lambert-St Louis
Mon 4/14
7:15 pm-11:43 pm
1 stop6h 28m
Best time to book a flight from San Diego to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from San Diego with our price prediction graph.
Travel insights for flights from San Diego to Illinois
Get recent, data-driven insights about flights from San Diego to Illinois including ideal travel times, pricing trends, and more.
What is the cheapest month to book a flight from San Diego to Illinois?
Currently, August is the cheapest month in which you can book a flight from San Diego to Illinois (average of $245). Flying from San Diego to Illinois in March is currently the most expensive (average of $327). 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 SAN to IL?
Find hourly flight availability from San Diego to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 10, 2025.
When flying from San Diego to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Weekly flight availability from San Diego to Illinois
Explore weekly flight availability from San Diego to Illinois. 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 March 10, 2025.
The most flights from SAN to USIL are scheduled on a Sunday (34 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (24 on average).
Rainfall in Illinois by month
Plan your trip to Illinois by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.
Temperature in Illinois by month
Plan your trip to Illinois by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated March 10, 2025.
To help decide which airline to fly from San Diego to Illinois, see what other customers have to say about Southwest, Alaska Airlines 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
Overall
Boarding
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Comfort
Overall
Boarding
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Comfort
Overall
Boarding
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Comfort
Overall
Boarding
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Comfort
Overall
Boarding
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Comfort
Overall
Boarding
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Related info for your journey
Find useful and relevant information for your journey from San Diego to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes for San Diego to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from San Diego to Illinois
Discover the top 7 airlines that operate flights from San Diego to Illinois. 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 March 10, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$90 | Average$206 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$93 | Average$199 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$217 | Average$466 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$242 | Average$503 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$258 | Average$386 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$269 | Average$475 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$391 | Average$807 | FlexibilityNo cancel fee | On-time75% |