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$54+ 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 1/23. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — ORD
Nov 26 — Dec 31
Tue 11/26
Tue 12/3
1 adult, Economy
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Cheap flight deals from San Diego to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) to Illinois (USIL). 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 21, 2024.

Find flight deals from San Diego to Illinois

Cheapest flights from San Diego to Illinois
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 November 21, 2024.

This Kiwi.com deal was found by Cheapflights users on 11/20. 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 12/510:35 amSAN - MDW
1 stop23h 13mFrontier
Mon 12/912:43 pmMDW - SAN
1 stop8h 27mFrontier
Deal found 11/20$140
This Kiwi.com deal was found by Cheapflights users on 11/21. 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.
Sat 12/147:15 pmSAN - ORD
1 stop8h 15mMultiple Airlines
Tue 12/178:26 pmORD - SAN
1 stop14h 50mMultiple Airlines
Deal found 11/21$142
This Cheapflightsfares deal was found by Cheapflights users on 11/21. 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.
Fri 12/136:15 amSAN - ORD
1 stop6h 11mSpirit Airlines
Sun 12/159:53 pmORD - SAN
1 stop12h 20mSpirit Airlines
Deal found 11/21$143
This eDestinos deal was found by Cheapflights users on 11/20. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/166:25 amSAN - ORD
1 stop28h 24mFrontier
Thu 12/191:07 pmORD - SAN
1 stop12h 47mFrontier
Deal found 11/20$144
This eDestinos deal was found by Cheapflights users on 11/20. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/157:15 pmSAN - MDW
1 stop14h 33mMultiple Airlines
Thu 12/198:41 pmMDW - SAN
1 stop27h 31mMultiple Airlines
Deal found 11/20$162
This CheapOair deal was found by Cheapflights users on 11/20. 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 12/26:25 amSAN - STL
1 stop15h 42mFrontier
Sun 12/88:34 pmSTL - SAN
1 stop24h 36mFrontier
Deal found 11/20$182
This Delta deal was found by Cheapflights users on 11/20. 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 12/412:00 pmSAN - STL
1 stop7h 55mDelta
Tue 12/106:30 amSTL - SAN
1 stop9h 57mDelta
Deal found 11/20$276
This Mytrip deal was found by Cheapflights users on 11/19. 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.
Mon 12/95:58 pmSAN - STL
2 stops19h 23mMultiple Airlines
Fri 12/1312:15 pmSTL - SAN
3 stops25h 55mMultiple Airlines
Deal found 11/19$279
This Delta deal was found by Cheapflights users on 11/19. 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 12/176:15 amSAN - ORD
1 stop6h 23mDelta
Tue 12/244:00 pmORD - SAN
1 stop8h 29mDelta
Deal found 11/19$300
This Delta deal was found by Cheapflights users on 11/19. 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.
Thu 12/126:15 amSAN - MDW
1 stop8h 46mDelta
Sat 12/149:30 amMDW - SAN
1 stop6h 57mDelta
Deal found 11/19$320
This American Airlines deal was found by Cheapflights users on 11/20. 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.
Mon 12/1612:47 pmSAN - MLI
1 stop7h 17mAmerican Airlines
Thu 1/23:32 pmMLI - SAN
1 stop7h 27mAmerican Airlines
Deal found 11/20$353
This United deal was found by Cheapflights users on 11/20. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/412:12 pmSAN - STL
1 stop6h 39mUnited Airlines
Tue 12/101:39 pmSTL - SAN
2 stops8h 14mUnited Airlines
Deal found 11/20$371

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 2,629,791 searches. Data last updated November 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

San DiegoChicago

SAN - MDW

SANMDW

San Diego

Thu 12/5

10:35 am-11:48 am

1 stop23h 13m

Chicago Midway

Mon 12/9

12:43 pm-7:10 pm

1 stop8h 27m

$140

San DiegoChicago

SAN - ORD

SANORD

San Diego

Sat 12/14

7:15 pm-5:30 am

1 stop8h 15m

Chicago O'Hare Intl

Mon 12/16

7:25 am-11:49 pm

1 stop18h 24m

$142

San DiegoChicago

SAN - ORD

SANORD

San Diego

Fri 12/13

6:15 am-2:26 pm

1 stop6h 11m

Chicago O'Hare Intl

Sun 12/15

9:53 pm-8:13 am

1 stop12h 20m

$143

San DiegoChicago

SAN - ORD

SANORD

San Diego

Mon 12/16

6:25 am-12:49 pm

1 stop28h 24m

Chicago O'Hare Intl

Thu 12/19

1:07 pm-11:54 pm

1 stop12h 47m

$144

San DiegoChicago

SAN - MDW

SANMDW

San Diego

Sun 12/15

7:15 pm-11:48 am

1 stop14h 33m

Chicago Midway

Thu 12/19

8:41 pm-10:12 pm

1 stop27h 31m

$162

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Mon 12/2

6:25 am-12:07 am

1 stop15h 42m

Lambert-St Louis

Sun 12/8

8:34 pm-7:10 pm

1 stop24h 36m

$182

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Wed 12/4

12:00 pm-9:55 pm

1 stop7h 55m

Lambert-St Louis

Tue 12/10

6:30 am-2:27 pm

1 stop9h 57m

$276

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Mon 12/9

5:58 pm-3:21 pm

2 stops19h 23m

Lambert-St Louis

Fri 12/13

12:15 pm-12:10 pm

3 stops25h 55m

$279

San DiegoMoline

SAN - MLI

SANMLI

San Diego

Fri 1/17

1:28 pm-9:58 pm

1 stop6h 30m

Moline Quad-City

Mon 1/20

12:55 pm-8:10 pm

1 stop9h 15m

$288

San DiegoChicago

SAN - ORD

SANORD

San Diego

Tue 2/18

11:20 am-11:56 pm

1 stop10h 36m

Chicago O'Hare Intl

Wed 2/26

7:00 am-8:31 pm

1 stop15h 31m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

Showing 1-10 of 52 results
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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.
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 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, September is the cheapest month in which you can book a flight from San Diego to Illinois (average of $232). Flying from San Diego to Illinois in June is currently the most expensive (average of $308). 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 November 21, 2024.

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 November 21, 2024.

The most flights from SAN to USIL are scheduled on a Thursday (31 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 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 November 21, 2024.
To help decide which airline to fly from San Diego to Illinois, see what other customers have to say about Spirit Airlines, Frontier 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.
Southwest
8.1
Very good
5,015 reviews

Food

7.2

Comfort

8.1

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.1
Very good
5,015 reviews
Southwest
8.1
Very good
5,015 reviews

Food

7.2

Comfort

8.1

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.0
Very good
9,458 reviews
Southwest
8.1
Very good
5,015 reviews

Food

7.2

Comfort

8.1

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
8,758 reviews
Southwest
8.1
Very good
5,015 reviews

Food

7.2

Comfort

8.1

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
9,172 reviews
Southwest
8.1
Very good
5,015 reviews

Food

7.2

Comfort

8.1

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

WestJet
7.3
Good
2,810 reviews
Southwest
8.1
Very good
5,015 reviews

Food

7.2

Comfort

8.1

Boarding

8.2

Entertainment

7.7

Crew

8.7

Overall

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

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.

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

    Located just 2.6 mi from the city center, San Diego (SAN) is the airport most travelers will use when flying to Illinois from San Diego.

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

    One-way options have recently been found by users for as low as $54 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $71 and American Airlines from $109 one-way.

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

    While some choose either San Diego - Chicago Midway or San Diego - Lambert-St Louis, San Diego - Chicago O'Hare Intl is the most popular route from San Diego to Illinois.

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

    The top 3 most reliable airlines when flying from San Diego to Illinois are Iberia (97%), Cathay Pacific (95%) and Lufthansa (89%).

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

    While on average a flight from San Diego to Illinois is generally $994, our data shows the cheapest flight currently is $130. When looking at the most popular route, (San Diego - Chicago O'Hare Intl), you can expect to pay $112 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Diego to Illinois 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 San Diego to Illinois?

    Currently, September is the cheapest month in which you can book a flight from San Diego to Illinois (average of $232). Flying from San Diego to Illinois in June is currently the most expensive (average of $308). 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

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Alternative routes for San Diego to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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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 2,629,791 searches. Data last updated November 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$91Average$200FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$100Average$226FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$217Average$478FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$245Average$516FlexibilityNo cancel feeOn-time69%
DeltaCheapest$251Average$357FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$252Average$485FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$391Average$751FlexibilityNo cancel feeOn-time75%
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