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$93+ 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 7/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAN
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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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 June 12, 2025.

Round-trip from

$176
(Cheapflightsfares)

One-way from

$93
(Kiwi.com)

Popular in

March

Cheapest in

June

Average price

$301

Good round-trip deal

$221 or less

Good one-way deal

$128 or less
From Illinois to San Diego
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One-way flight from Illinois to San Diego
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Highest demand for flights based on searches. 6% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Illinois to San Diego.
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Price to beat on a one-way flight from Illinois to San Diego.
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Find flight deals from Illinois to San Diego

Cheapest flights from Illinois to San Diego
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 June 12, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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.
Wed 6/181:56 pmORD - SAN
Nonstop4h 12mFrontier
Sat 6/214:53 pmSAN - ORD
Nonstop4h 03mFrontier
Deal found 6/10$176
This FlightHub deal was found by Cheapflights users on 6/10. 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.
Tue 6/2411:50 amORD - SAN
1 stop13h 39mSpirit Airlines
Mon 6/305:50 pmSAN - ORD
2 stops13h 48mSpirit Airlines
Deal found 6/10$177
This Priceline deal was found by Cheapflights users on 6/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/241:56 pmORD - SAN
Nonstop4h 12mMultiple Airlines
Mon 6/307:31 pmSAN - ORD
1 stop8h 41mMultiple Airlines
Deal found 6/10$178
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/228:50 pmMDW - SAN
Nonstop4h 15mSouthwest
Tue 8/268:10 amSAN - MDW
Nonstop4h 00mSouthwest
Deal found 6/10$186
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Fri 8/229:13 amORD - SAN
Nonstop4h 27mUnited Airlines
Tue 8/262:11 pmSAN - ORD
Nonstop4h 14mUnited Airlines
Deal found 6/10$186
This Mytrip deal was found by Cheapflights users on 6/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/98:39 pmPIA - SAN
1 stop26h 06mMultiple Airlines
Wed 7/166:15 amSAN - PIA
1 stop11h 34mMultiple Airlines
Deal found 6/9$215
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/151:03 pmORD - SAN
1 stop9h 51mAlaska Airlines
Mon 8/187:00 amSAN - ORD
1 stop14h 39mAlaska Airlines
Deal found 6/10$230
This American Airlines deal was found by Cheapflights users on 6/11. 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 7/57:14 amORD - SAN
Nonstop4h 14mAmerican Airlines
Sat 7/1210:45 pmSAN - ORD
Nonstop4h 11mAmerican Airlines
Deal found 6/11$239
This Mytrip deal was found by Cheapflights users on 6/12. 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.
Thu 7/1010:47 amSTL - SAN
2 stops25h 08mSpirit Airlines
Thu 7/176:15 amSAN - STL
2 stops25h 37mSpirit Airlines
Deal found 6/12$240
This Hawaiian Airlines deal was found by Cheapflights users on 6/12. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/93:20 pmORD - SAN
1 stop9h 42mHawaiian Airlines
Mon 10/135:19 pmSAN - ORD
Nonstop4h 40mHawaiian Airlines
Deal found 6/12$247
This Frontier deal was found by Cheapflights users on 6/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/227:54 pmSTL - SAN
1 stop5h 58mFrontier
Mon 8/259:11 pmSAN - STL
1 stop10h 00mFrontier
Deal found 6/9$251
This Delta deal was found by Cheapflights users on 6/10. 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.
Sat 8/231:08 pmMDW - SAN
1 stop6h 53mDelta
Tue 8/2610:30 pmSAN - MDW
1 stop8h 46mDelta
Deal found 6/10$257

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 June 12, 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

Wed 6/18

1:56 pm-4:08 pm

Nonstop4h 12m

San Diego

Sat 6/21

4:53 pm-10:56 pm

Nonstop4h 03m

$176

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Tue 6/24

11:50 am-11:29 pm

1 stop13h 39m

San Diego

Mon 6/30

5:50 pm-9:38 am

2 stops13h 48m

$177

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Tue 6/24

1:56 pm-4:08 pm

Nonstop4h 12m

San Diego

Mon 6/30

7:31 pm-6:12 am

1 stop8h 41m

$178

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Fri 8/22

8:50 pm-11:05 pm

Nonstop4h 15m

San Diego

Tue 8/26

8:10 am-2:10 pm

Nonstop4h 00m

$186

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Fri 8/22

9:13 am-11:40 am

Nonstop4h 27m

San Diego

Tue 8/26

2:11 pm-8:25 pm

Nonstop4h 14m

$186

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Sun 8/17

9:00 pm-11:23 pm

Nonstop4h 23m

San Diego

Sat 8/23

1:08 pm-7:25 pm

Nonstop4h 17m

$199

PeoriaSan Diego

PIA - SAN

PIASAN

Greater Peoria

Wed 7/9

8:39 pm-8:45 pm

1 stop26h 06m

San Diego

Wed 7/16

6:15 am-7:49 pm

1 stop11h 34m

$215

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Fri 8/15

1:03 pm-8:54 pm

1 stop9h 51m

San Diego

Mon 8/18

7:00 am-11:39 pm

1 stop14h 39m

$230

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Thu 7/10

10:47 am-9:55 am

2 stops25h 08m

San Diego

Thu 7/17

6:15 am-9:52 am

2 stops25h 37m

$240

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Fri 8/22

7:54 pm-11:52 pm

1 stop5h 58m

San Diego

Mon 8/25

9:11 pm-9:11 am

1 stop10h 00m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 60 results
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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 June 12, 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 June 12, 2025.

The most flights from USIL to SAN are scheduled on a Thursday (45 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 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 June 12, 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Allegiant Air
7.3
Good
725 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • What airport do you fly into for flights to San Diego from Illinois?

    Most people fly into San Diego (SAN) if they book a flight to San Diego from Illinois. San Diego is conveniently located just 2.6 mi from San Diego’s city center.

  • What are the cheapest airlines to fly from Illinois to San Diego one-way?

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $93. Alaska Airlines flights start at $96 while deals on Frontier start at $99 one-way.

  • What are the most popular routes from Illinois to San Diego?

    Most travelers choose Chicago O'Hare Intl - San Diego, Chicago Midway - San Diego or Lambert-St Louis - San Diego when deciding on the best route from Illinois to San Diego.

  • What are the most reliable airlines from Illinois to San Diego?

    Consider Japan Airlines (96%), Austrian Airlines (90%) or Air Canada (88%) when booking your flight. These represent the most reliable airlines when flying from Illinois to San Diego.

  • What are the cheapest flights from Illinois to San Diego?

    The cheapest flight price from Illinois to San Diego is $88. On average you can expect to pay $658. The most popular route, (Chicago O'Hare Intl - San Diego), can usually be booked for $94.

  • Can I find deals for flights from Illinois to San Diego that include hotel bookings?

    Yes. In addition to deals on Illinois to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to San Diego.

  • Can I find deals for business class flights from Illinois to San Diego?

    Yes. Cheapflights offers flight deals from Illinois to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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.

See more FAQs

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
El Cajon
Chula Vista
National City
Imperial Beach
La Mesa
Alpine
Lemon Grove
Poway
Santee
Coronado

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Alternative routes for Illinois to San Diego

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$97Average$224FlexibilityNo cancel feeOn-time65%
FrontierCheapest$108Average$203FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$216Average$424FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$220Average$469FlexibilityNo cancel feeOn-time63%
DeltaCheapest$236Average$338FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$246Average$566FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$246Average$456FlexibilityNo cancel feeOn-time69%

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