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$54+ 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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAN
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
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Cheap flight deals from Illinois to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Illinois (USIL) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 18, 2024.

Round-trip from

$165
(Trip.com)

One-way from

$54
(Frontier)
From Illinois to San Diego
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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 December 18, 2024.

This CheapOair deal was found by Cheapflights users on 12/17. 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.
Tue 12/319:54 pmORD - SAN
1 stop26h 18mSpirit Airlines
Tue 1/77:16 pmSAN - ORD
1 stop8h 14mSpirit Airlines
Deal found 12/17$225
This CheapOair deal was found by Cheapflights users on 12/18. 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.
Tue 12/316:20 amMDW - SAN
1 stop9h 44mFrontier
Tue 1/76:25 amSAN - MDW
1 stop15h 48mFrontier
Deal found 12/18$254
This FlightHub deal was found by Cheapflights users on 12/17. 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.
Mon 12/236:00 amORD - SAN
1 stop19h 54mFrontier
Thu 12/266:25 amSAN - ORD
1 stop11h 09mFrontier
Deal found 12/17$274
This Delta deal was found by Cheapflights users on 12/17. 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.
Tue 12/244:50 pmMDW - SAN
1 stop6h 16mDelta
Tue 12/3110:23 pmSAN - MDW
1 stop8h 27mDelta
Deal found 12/17$302
This American Airlines deal was found by Cheapflights users on 12/17. 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 12/319:07 pmORD - SAN
Nonstop4h 33mAmerican Airlines
Tue 1/71:28 pmSAN - ORD
Nonstop4h 10mAmerican Airlines
Deal found 12/17$317
This CheapOair deal was found by Cheapflights users on 12/17. 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.
Tue 12/319:54 pmORD - SAN
1 stop21h 17mMultiple Airlines
Thu 1/26:25 amSAN - ORD
1 stop11h 09mMultiple Airlines
Deal found 12/17$331
This CheapOair deal was found by Cheapflights users on 12/16. 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.
Mon 12/239:29 pmSTL - SAN
1 stop14h 27mFrontier
Tue 12/316:25 amSAN - STL
1 stop23h 48mFrontier
Deal found 12/16$334
This Delta deal was found by Cheapflights users on 12/17. 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.
Wed 12/2510:30 amORD - SAN
1 stop9h 40mDelta
Wed 1/17:20 amSAN - ORD
1 stop9h 32mDelta
Deal found 12/17$347
This American Airlines deal was found by Cheapflights users on 12/18. 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 12/316:00 pmSTL - SAN
1 stop7h 40mAmerican Airlines
Tue 1/76:33 amSAN - STL
1 stop5h 09mAmerican Airlines
Deal found 12/18$357
This Trip.com deal was found by Cheapflights users on 12/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2212:00 pmSTL - SAN
1 stop23h 16mMultiple Airlines
Mon 1/66:25 amSAN - STL
1 stop13h 51mMultiple Airlines
Deal found 12/17$446
This Southwest deal was found by Cheapflights users on 12/17. 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.
Wed 12/2511:15 amMDW - SAN
1 stop6h 35mSouthwest
Tue 12/313:40 pmSAN - MDW
1 stop5h 45mSouthwest
Deal found 12/17$454
This Southwest deal was found by Cheapflights users on 12/16. 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.
Tue 12/244:20 pmORD - SAN
1 stop8h 10mSouthwest
Tue 12/3112:50 pmSAN - ORD
2 stops7h 45mSouthwest
Deal found 12/16$474

Find flights from Illinois to San Diego within your budget

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Wed 1/22

1:39 pm-12:36 pm

1 stop24h 57m

San Diego

Fri 1/24

7:26 pm-9:52 pm

1 stop24h 26m

$162

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Thu 2/6

7:15 am-11:52 pm

1 stop18h 37m

San Diego

Sun 2/9

10:40 am-11:44 am

1 stop23h 04m

$165

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Wed 1/29

1:39 pm-10:18 pm

1 stop10h 39m

San Diego

Sun 2/2

6:25 am-12:32 am

1 stop16h 07m

$166

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Fri 2/14

6:50 am-12:20 am

1 stop19h 30m

San Diego

Sun 2/16

10:42 am-8:46 pm

1 stop8h 04m

$169

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Fri 1/17

3:15 pm-8:48 pm

1 stop7h 33m

San Diego

Mon 1/20

5:01 pm-12:17 am

2 stops29h 16m

$190

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 3/8

6:59 pm-10:48 am

1 stop17h 49m

San Diego

Thu 3/13

4:06 pm-9:16 am

1 stop15h 10m

$196

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Tue 1/7

2:49 pm-10:33 pm

1 stop9h 44m

San Diego

Thu 1/9

10:35 am-7:34 pm

1 stop6h 59m

$197

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Tue 2/18

5:45 pm-8:04 pm

Nonstop4h 19m

San Diego

Sat 2/22

1:34 pm-7:38 pm

Nonstop4h 04m

$237

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Sat 1/18

3:20 pm-5:55 pm

Nonstop4h 35m

San Diego

Sat 1/25

2:35 pm-8:25 pm

Nonstop3h 50m

$238

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Fri 2/28

3:21 pm-11:59 pm

1 stop10h 38m

San Diego

Mon 3/3

7:00 am-11:59 pm

1 stop14h 59m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 57 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.

Travel insights for flights from Illinois to San Diego

Get recent, data-driven insights about flights from Illinois to San Diego including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Illinois to San Diego?

Currently, September is the cheapest month in which you can book a flight from Illinois to San Diego (average of $266). Flying from Illinois to San Diego in March is currently the most expensive (average of $339). 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 December 18, 2024.

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.

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 December 18, 2024.
To help decide which airline to fly from Illinois to San Diego, see what other customers have to say about Frontier, American Airlines and Alaska Airlines. 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.
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

Alaska Airlines
8.0
Very good
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

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 Frontier, which is currently one of the cheapest options available, starting at $54. Spirit Airlines flights start at $76 while deals on American Airlines start at $118 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 (100%), Brussels Airlines (88%) or Alaska Airlines (86%) 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 $169. On average you can expect to pay $664. The most popular route, (Chicago O'Hare Intl - San Diego), can usually be booked for $103.

  • 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, September is the cheapest month in which you can book a flight from Illinois to San Diego (average of $266). Flying from Illinois to San Diego in March is currently the most expensive (average of $339). 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.

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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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$103Average$212FlexibilityNo cancel feeOn-time65%
FrontierCheapest$105Average$193FlexibilityNo cancel feeOn-time62%
DeltaCheapest$171Average$405FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$185Average$445FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$201Average$480FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$247Average$453FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$329Average$704FlexibilityNo cancel feeOn-time75%
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