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Illinois

$89+ Cheap flights from San Jose (SJC) 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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ORD
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from San Jose to Illinois

Keep the following information in mind while searching for San Jose to Illinois flight deals. Data was last updated August 18, 2025.

Round-trip from

$181
(FlightHub)

One-way from

$89
(FlightHub)

Popular in

June

Cheapest in

January

Average price

$433

Good round-trip deal

$322 or less

Good one-way deal

$169 or less
From San Jose to Illinois
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One-way flight from San Jose to Illinois
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Highest demand for flights based on searches. 9% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from San Jose to Illinois.
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Price to beat on a one-way flight from San Jose to Illinois.
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Find flight deals from San Jose to Illinois

Cheapest flights from San Jose to Illinois
Explore the most affordable flight options available from San Jose to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This FlightHub deal was found by Cheapflights users on 8/17. 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.
Thu 9/252:14 pmSJC - STL
1 stop16h 52mFrontier
Wed 10/17:55 pmSTL - SJC
1 stop19h 19mFrontier
Deal found 8/17$181
This FlightHub deal was found by Cheapflights users on 8/15. 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.
Fri 10/1012:35 pmSJC - STL
1 stop18h 32mFrontier
Sun 10/127:52 pmSTL - SJC
1 stop17h 40mFrontier
Deal found 8/15$215
This FlightHub deal was found by Cheapflights users on 8/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1912:25 pmSJC - STL
1 stop18h 41mFrontier
Sun 9/212:38 pmSTL - SJC
1 stop29h 07mFrontier
Deal found 8/18$217
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/411:40 amSJC - STL
1 stop24h 13mMultiple Airlines
Mon 9/89:29 pmSTL - SJC
1 stop15h 16mMultiple Airlines
Deal found 8/17$219
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/511:40 amSJC - STL
1 stop26h 23mMultiple Airlines
Mon 9/89:29 pmSTL - SJC
1 stop15h 16mMultiple Airlines
Deal found 8/17$221
This FlightHub deal was found by Cheapflights users on 8/17. 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.
Thu 8/2112:22 pmSJC - STL
1 stop18h 49mFrontier
Sun 9/72:38 pmSTL - SJC
1 stop29h 07mFrontier
Deal found 8/17$231
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/95:55 amSJC - ORD
1 stop6h 32mMultiple Airlines
Tue 10/147:15 amORD - SJC
2 stops26h 03mMultiple Airlines
Deal found 8/16$249
This KAYAK deal was found by Cheapflights users on 8/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/166:35 amSJC - ORD
2 stops9h 39mSpirit Airlines
Fri 9/197:09 pmORD - SJC
2 stops17h 36mSpirit Airlines
Deal found 8/17$250
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3112:01 pmSJC - ORD
1 stop10h 31mMultiple Airlines
Wed 9/37:20 amORD - SJC
2 stops29h 25mMultiple Airlines
Deal found 8/17$251
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Thu 9/187:12 pmSJC - ORD
1 stop23h 47mFrontier
Sun 9/216:00 amORD - SJC
1 stop7h 26mFrontier
Deal found 8/17$253
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/266:35 amSJC - ORD
1 stop8h 24mSpirit Airlines
Tue 9/3011:15 amORD - SJC
1 stop10h 45mSpirit Airlines
Deal found 8/16$254
This KAYAK deal was found by Cheapflights users on 8/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/611:40 amSJC - ORD
1 stop7h 52mSpirit Airlines
Tue 9/911:15 amORD - SJC
1 stop10h 45mSpirit Airlines
Deal found 8/16$255

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Jose 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 August 18, 2025.
Use the filters below to find and compare flights from San Jose to Illinois that are best for you.

Fly from

San Jose

Fly to

Illinois

Route

Depart

Return

Price

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Thu 9/25

2:14 pm-9:06 am

1 stop16h 52m

Lambert-St Louis

Wed 10/1

7:55 pm-1:14 pm

1 stop19h 19m

$181

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Fri 10/10

12:35 pm-9:07 am

1 stop18h 32m

Lambert-St Louis

Sun 10/12

7:52 pm-11:32 am

1 stop17h 40m

$215

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Fri 9/19

12:25 pm-9:06 am

1 stop18h 41m

Lambert-St Louis

Sun 9/21

2:38 pm-5:45 pm

1 stop29h 07m

$217

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Thu 9/4

11:40 am-1:53 pm

1 stop24h 13m

Lambert-St Louis

Mon 9/8

9:29 pm-10:45 am

1 stop15h 16m

$219

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Fri 9/5

11:40 am-4:03 pm

1 stop26h 23m

Lambert-St Louis

Mon 9/8

9:29 pm-10:45 am

1 stop15h 16m

$221

San JoseChicago

SJC - ORD

SJCORD

San Jose

Tue 9/16

6:35 am-6:14 pm

2 stops9h 39m

Chicago O'Hare Intl

Fri 9/19

7:09 pm-10:45 am

2 stops17h 36m

$250

San JoseChicago

SJC - ORD

SJCORD

San Jose

Wed 9/24

6:35 am-6:14 pm

2 stops9h 39m

Chicago O'Hare Intl

Mon 9/29

7:09 pm-10:45 am

2 stops17h 36m

$250

San JoseChicago

SJC - ORD

SJCORD

San Jose

Thu 10/2

11:40 am-11:59 am

2 stops22h 19m

Chicago O'Hare Intl

Wed 10/8

1:26 pm-7:18 am

2 stops19h 52m

$250

San JoseChicago

SJC - ORD

SJCORD

San Jose

Fri 10/31

6:19 pm-11:30 am

2 stops15h 11m

Chicago O'Hare Intl

Mon 11/3

6:00 am-5:34 pm

2 stops13h 34m

$250

San JoseChicago

SJC - ORD

SJCORD

San Jose

Sun 8/31

12:01 pm-12:32 am

1 stop10h 31m

Chicago O'Hare Intl

Wed 9/3

7:20 am-10:45 am

2 stops29h 25m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/15

Showing 1-10 of 60 results
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Best time to book a flight from San Jose to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from San Jose 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 San Jose to Illinois

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

Currently, August is the cheapest month in which you can book a flight from San Jose to Illinois (average of $245). Flying from San Jose to Illinois in March is currently the most expensive (average of $321). 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 SJC to IL?

Find hourly flight availability from San Jose 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 August 18, 2025.

When flying from San Jose 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.

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 August 18, 2025.
Read through reviews of airlines operating flights from San Jose to Illinois, such as Southwest, United Airlines, and American Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,925 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Spirit Airlines
6.3
Okay
8,038 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,212 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from San Jose 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 Jose to Illinois?

    For a flight from San Jose to Illinois, you will be flying from San Jose. San Jose (SJC) is just 2.9 mi from the center of the city.

  • How long is the flight from San Jose to Illinois?

    Frontier, Spirit Airlines, and Delta can get you from San Jose to Illinois in just under 7h 34m. Your travel time can differ by up to 9h 18m. The distance from San Jose to Illinois is about 1832 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    The cheapest airlines for a one-way flight from San Jose to Illinois are Frontier ($89), Alaska Airlines ($102), and Hawaiian Airlines ($102).

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

    The most popular route from San Jose to Illinois is San Jose - Chicago O'Hare Intl. You may also consider San Jose - Chicago Midway or San Jose - Lambert-St Louis.

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

    While on average a flight from San Jose to Illinois is generally $448, our data shows the cheapest flight currently is $155. When looking at the most popular route, (San Jose - Chicago O'Hare Intl), you can expect to pay $112 for that flight.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from San Jose to Illinois (average of $245). Flying from San Jose to Illinois in March is currently the most expensive (average of $321). 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 Jose to Illinois

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Top 7 airlines flying from San Jose to Illinois

Discover the top 7 airlines that operate flights from San Jose 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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$98Average$253FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$108Average$222FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$170Average$243FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$200Average$556FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$212Average$491FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$357FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$351Average$492FlexibilityNo cancel feeOn-time63%

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