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$53+ 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 1/29. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SAN
Nov 19 — Nov 261
Tue 11/19
Tue 11/26
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 November 14, 2024.

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 November 14, 2024.

This FareScan deal was found by Cheapflights users on 11/13. 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 FareScan is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/79:10 pmORD - SAN
1 stop13h 03mSpirit Airlines
Wed 12/111:05 pmSAN - ORD
1 stop23h 21mSpirit Airlines
Deal found 11/13$147
This FlightHub deal was found by Cheapflights users on 11/14. 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.
Thu 11/216:00 amORD - SAN
1 stop27h 38mFrontier
Sun 11/2410:39 amSAN - ORD
1 stop12h 27mFrontier
Deal found 11/14$148
This Mytrip deal was found by Cheapflights users on 11/13. 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 11/279:48 pmMDW - SAN
1 stop28h 08mFrontier
Wed 12/41:48 pmSAN - MDW
1 stop8h 25mFrontier
Deal found 11/13$149
This Kiwi.com deal was found by Cheapflights users on 11/13. 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.
Thu 12/57:25 amORD - SAN
1 stop18h 24mMultiple Airlines
Wed 12/117:15 pmSAN - ORD
1 stop8h 15mMultiple Airlines
Deal found 11/13$150
This CheapOair deal was found by Cheapflights users on 11/13. 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.
Wed 12/46:46 pmSTL - SAN
1 stop18h 12mFrontier
Sun 12/86:25 amSAN - STL
1 stop23h 48mFrontier
Deal found 11/13$214
This American Airlines deal was found by Cheapflights users on 11/13. 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 12/102:15 pmSTL - SAN
1 stop8h 39mAmerican Airlines
Tue 1/79:29 amSAN - STL
1 stop8h 01mAmerican Airlines
Deal found 11/13$218
This Kissandfly.com deal was found by Cheapflights users on 11/13. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/1012:57 pmMDW - SAN
2 stops20h 39mMultiple Airlines
Thu 12/1212:00 pmSAN - MDW
2 stops21h 48mMultiple Airlines
Deal found 11/13$254
This United Airlines deal was found by Cheapflights users on 11/13. 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.
Tue 12/1010:55 amPIA - SAN
1 stop6h 37mUnited Airlines
Mon 12/1610:20 amSAN - PIA
1 stop8h 36mUnited Airlines
Deal found 11/13$263
This American Airlines deal was found by Cheapflights users on 11/13. 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 12/106:00 amPIA - SAN
2 stops8h 25mAmerican Airlines
Mon 12/161:45 pmSAN - PIA
1 stop8h 05mAmerican Airlines
Deal found 11/13$268
This Delta deal was found by Cheapflights users on 11/13. 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.
Sun 12/86:46 pmSTL - SAN
1 stop7h 10mDelta
Sun 1/510:23 pmSAN - STL
1 stop9h 13mDelta
Deal found 11/13$276
This Delta deal was found by Cheapflights users on 11/13. 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 12/185:50 pmMDW - SAN
1 stop7h 02mDelta
Wed 12/256:15 amSAN - MDW
1 stop8h 56mDelta
Deal found 11/13$280
This Delta deal was found by Cheapflights users on 11/13. 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 12/185:20 pmORD - SAN
1 stop7h 32mDelta
Wed 1/2210:15 amSAN - ORD
1 stop6h 08mDelta
Deal found 11/13$280

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 2,752,363 searches. Data last updated November 14, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Fri 1/17

12:43 pm-6:58 pm

1 stop8h 15m

San Diego

Tue 1/21

2:32 pm-12:17 am

1 stop7h 45m

$147

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Tue 1/7

9:54 pm-5:11 pm

1 stop21h 17m

San Diego

Tue 1/14

7:26 pm-5:30 am

1 stop8h 04m

$147

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Thu 11/21

6:00 am-7:38 am

1 stop27h 38m

San Diego

Sun 11/24

10:39 am-1:06 am

1 stop12h 27m

$148

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Thu 12/5

7:25 am-11:49 pm

1 stop18h 24m

San Diego

Wed 12/11

7:15 pm-5:30 am

1 stop8h 15m

$150

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Thu 12/19

10:09 pm-11:54 pm

1 stop27h 45m

San Diego

Sun 12/22

6:25 am-9:19 pm

1 stop12h 54m

$224

MolineSan Diego

MLI - SAN

MLISAN

Moline Quad-City

Sat 2/8

12:55 pm-8:10 pm

1 stop9h 15m

San Diego

Wed 2/12

6:15 am-2:56 pm

1 stop6h 41m

$238

PeoriaSan Diego

PIA - SAN

PIASAN

Greater Peoria

Wed 1/29

3:33 pm-10:04 pm

1 stop8h 31m

San Diego

Wed 2/5

11:13 am-9:21 pm

1 stop8h 08m

$238

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Wed 1/15

6:46 pm-11:49 pm

1 stop7h 03m

San Diego

Sun 1/19

8:00 am-11:59 pm

2 stops13h 59m

$247

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Tue 12/10

12:57 pm-7:36 am

2 stops20h 39m

San Diego

Thu 12/12

12:00 pm-11:48 am

2 stops21h 48m

$254

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sun 1/26

2:49 pm-11:59 pm

1 stop11h 10m

San Diego

Sat 2/1

4:27 pm-1:53 pm

2 stops19h 26m

$265

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/14

Showing 1-10 of 59 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 November 14, 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.

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 November 14, 2024.

The most flights from USIL to SAN are scheduled on a Thursday (32 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 November 14, 2024.
To help decide which airline to fly from Illinois to San Diego, see what other customers have to say about Spirit Airlines, United Airlines and American 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
5,045 reviews

Boarding

8.3

Food

7.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

Southwest
8.1
Very good
5,045 reviews
Southwest
8.1
Very good
5,045 reviews

Boarding

8.3

Food

7.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

Alaska Airlines
8.0
Very good
9,439 reviews
Southwest
8.1
Very good
5,045 reviews

Boarding

8.3

Food

7.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

Delta
8.0
Very good
8,788 reviews
Southwest
8.1
Very good
5,045 reviews

Boarding

8.3

Food

7.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

United Airlines
7.4
Good
9,194 reviews
Southwest
8.1
Very good
5,045 reviews

Boarding

8.3

Food

7.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

WestJet
7.3
Good
2,804 reviews
Southwest
8.1
Very good
5,045 reviews

Boarding

8.3

Food

7.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

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 $53. Spirit Airlines flights start at $74 while deals on American Airlines start at $89 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 Finnair (100%), Japan Airlines (97%) or SWISS (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 $150. On average you can expect to pay $706. The most popular route, (Chicago O'Hare Intl - San Diego), can usually be booked for $127.

  • 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 2,752,363 searches. Data last updated November 14, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$104Average$196FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$107Average$219FlexibilityNo cancel feeOn-time65%
DeltaCheapest$171Average$404FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$185Average$442FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$201Average$397FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$238Average$445FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$329Average$693FlexibilityNo cancel feeOn-time75%
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