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Cheap flights from San Diego to Illinois from $60

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Diego to Illinois departing on 3/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from San Diego to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:05 am - 7:12 pm
SAN
-
STL
10h 07m
1 stop
Frontier Logo
8:12 pm - 12:01 am
STL
-
SAN
29h 49m
1 stop
$128Frontier
Sat, Apr 25 - Sat, May 2
Frontier Logo
7:05 am - 7:12 pm
SAN
-
STL
10h 07m
1 stop
Frontier Logo
8:12 pm - 8:34 am
STL
-
SAN
14h 22m
1 stop
$142Frontier
Sat, Apr 25 - Thu, Apr 30
Frontier Logo
7:05 am - 7:12 pm
SAN
-
STL
10h 07m
1 stop
Frontier Logo
8:12 pm - 8:04 pm
STL
-
SAN
25h 52m
1 stop
$143Frontier
Sat, Apr 25 - Fri, May 1
Southwest Logo
10:40 pm - 4:35 am
SAN
-
MDW
3h 55mnonstop
Southwest Logo
6:10 pm - 8:30 pm
MDW
-
SAN
4h 20mnonstop
$163Southwest
Wed, Apr 29 - Sat, May 2
Hawaiian Airlines Logo
5:42 pm - 11:59 pm
SAN
-
ORD
4h 17mnonstop
Hawaiian Airlines Logo
8:20 am - 11:02 am
ORD
-
SAN
4h 42mnonstop
$164Hawaiian Airlines
Mon, Mar 9 - Wed, Mar 18
United Airlines Logo
2:05 pm - 8:17 pm
SAN
-
ORD
4h 12mnonstop
United Airlines Logo
7:00 am - 9:40 am
ORD
-
SAN
4h 40mnonstop
$167United Airlines
Wed, Apr 22 - Sun, Apr 26
Southwest Logo
4:45 pm - 10:35 pm
SAN
-
MDW
3h 50mnonstop
Southwest Logo
5:45 am - 8:10 am
MDW
-
SAN
4h 25mnonstop
$167Southwest
Fri, Mar 13 - Wed, Mar 18
United Airlines Logo
10:30 am - 10:22 pm
SAN
-
MLI
9h 52m
2 stops
United Airlines Logo
2:00 pm - 6:51 pm
MLI
-
SAN
6h 51m
1 stop
$256United Airlines
Tue, Mar 24 - Wed, Apr 1
American Airlines Logo
3:19 pm - 11:37 pm
SAN
-
MLI
6h 18m
1 stop
American Airlines Logo
6:00 am - 12:41 pm
MLI
-
SAN
8h 41m
1 stop
$264American Airlines
Tue, Mar 24 - Wed, Apr 1
American Airlines Logo
10:45 pm - 9:36 am
SAN
-
PIA
8h 51m
1 stop
American Airlines Logo
6:30 pm - 11:23 pm
PIA
-
SAN
6h 53m
1 stop
$334American Airlines
Wed, Aug 5 - Mon, Aug 10

Hawaiian Airlines flights from San Diego to Illinois

Our best Hawaiian Airlines deals on San Diego to Illinois flight tickets
Hawaiian Airlines
Mar 9
SAN5:42 pmSan Diego
4h 17m
ORD11:59 pmChicago O'Hare Intl
Mar 18
ORD8:20 amChicago O'Hare Intl
4h 42m
SAN11:02 amSan Diego
$164
Hawaiian Airlines
Mar 13
SAN5:42 pmSan Diego
4h 17m
ORD11:59 pmChicago O'Hare Intl
Mar 16
ORD7:40 amChicago O'Hare Intl
4h 49m
SAN10:29 amSan Diego
$189

Frontier flights from San Diego to Illinois

Our best Frontier deals on San Diego to Illinois flight tickets
Frontier
Apr 25
SAN7:05 amSan Diego
10h 07m
1 stop
STL7:12 pmLambert-St Louis
May 2
STL8:12 pmLambert-St Louis
29h 49m
1 stop
SAN12:01 amSan Diego
$128
Frontier
Apr 25
SAN7:05 amSan Diego
10h 07m
1 stop
STL7:12 pmLambert-St Louis
Apr 30
STL8:12 pmLambert-St Louis
14h 22m
1 stop
SAN8:34 amSan Diego
$142
Frontier
Apr 25
SAN7:05 amSan Diego
10h 07m
1 stop
STL7:12 pmLambert-St Louis
May 1
STL8:12 pmLambert-St Louis
25h 52m
1 stop
SAN8:04 pmSan Diego
$143

momondo Fare Finder

 
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, momondo users made 832,500 searches. Data last updated February 10, 2026.
Use the filters below to find and compare flights from San Diego to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Sat 4/25

7:05 am-7:12 pm

1 stop10h 07m

Lambert-St Louis

Sat 5/2

8:12 pm-12:01 am

1 stop29h 49m

$128

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Sat 4/25

7:05 am-7:12 pm

1 stop10h 07m

Lambert-St Louis

Thu 4/30

8:12 pm-8:34 am

1 stop14h 22m

$142

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Sat 4/25

7:05 am-7:12 pm

1 stop10h 07m

Lambert-St Louis

Fri 5/1

8:12 pm-8:04 pm

1 stop25h 52m

$143

San DiegoChicago

SAN - MDW

SANMDW

San Diego

Wed 4/29

10:40 pm-4:35 am

Nonstop3h 55m

Chicago Midway

Sat 5/2

6:10 pm-8:30 pm

Nonstop4h 20m

$163

San DiegoChicago

SAN - ORD

SANORD

San Diego

Mon 3/9

5:42 pm-11:59 pm

Nonstop4h 17m

Chicago O'Hare Intl

Wed 3/18

8:20 am-11:02 am

Nonstop4h 42m

$164

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 4/22

2:05 pm-8:17 pm

Nonstop4h 12m

Chicago O'Hare Intl

Sun 4/26

7:00 am-9:40 am

Nonstop4h 40m

$167

San DiegoChicago

SAN - MDW

SANMDW

San Diego

Fri 3/13

4:45 pm-10:35 pm

Nonstop3h 50m

Chicago Midway

Wed 3/18

5:45 am-8:10 am

Nonstop4h 25m

$167

San DiegoMoline

SAN - MLI

SANMLI

San Diego

Tue 3/24

10:30 am-10:22 pm

2 stops9h 52m

Moline Quad-City

Wed 4/1

2:00 pm-6:51 pm

1 stop6h 51m

$256

San DiegoMoline

SAN - MLI

SANMLI

San Diego

Tue 3/24

3:19 pm-11:37 pm

1 stop6h 18m

Moline Quad-City

Wed 4/1

6:00 am-12:41 pm

1 stop8h 41m

$264

San DiegoPeoria

SAN - PIA

SANPIA

San Diego

Wed 8/5

10:45 pm-9:36 am

1 stop8h 51m

Greater Peoria

Mon 8/10

6:30 pm-11:23 pm

1 stop6h 53m

$334

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from San Diego to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from San Diego is in October. Flight prices, which tend to average around $237, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of October, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $239.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from San Diego to Illinois is on a Thursday when prices can be found for as low as $384. Flights from San Diego to Illinois on a Sunday will generally be more expensive and average around $556. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from San Diego to Illinois during this time can be as low as $261. Flights in the morning are often more expensive with an average ticket price of $448.

What is the cheapest San Diego to Illinois flight route?

Fly from San Diego to Chicago O'Hare Intl for the best San Diego - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $301 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from San Diego for as low as $246 on momondo.

What cabin class options are available on San Diego to Illinois flights?

There are 4 cabin classes available to choose from on San Diego to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on San Diego to Illinois flights?

You could potentially save up to 3% on your flight if you consider stops on a San Diego to Illinois flight.

Cheap San Diego to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Diego to Illinois

Best Price Found

$135

Fastest flight time

3h 30m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from San Diego in the past 72 hours is $135. The best round-trip flight deal from San Diego to Illinois found on momondo in the last 72 hours is $254.
The fastest flight from San Diego to Illinois takes 3h 30m
Direct flights go from San Diego to Illinois every day.
There are 98 airports in Illinois. From San Diego there are direct flights to Chicago Midway (MDW), Lambert-St Louis (STL).
Search flight deals

  • When did momondo last update prices for flights from San Diego Airport to Illinois?

    Prices for flights from San Diego Airport to Illinois refresh daily.

  • How many operators does momondo search for flights from San Diego Airport to Illinois?

  • How old do you have to be to fly from San Diego Airport to Illinois?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from San Diego Airport to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from San Diego to Illinois?

Best airlines flying from San Diego to Illinois

Compare and see reviews for airlines that fly from San Diego to Illinois with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $92Free CancellationRating
6.3
8,437 reviews
Search Spirit Airlines flights
FrontierPriceFrom $110Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
Alaska AirlinesPriceFrom $138Free CancellationRating
8.0
11,871 reviews
Search Alaska Airlines flights
Hawaiian AirlinesPriceFrom $139Free CancellationRating
7.8
2,831 reviews
Search Hawaiian Airlines flights
American AirlinesPriceFrom $158Free CancellationRating
7.2
11,260 reviews
Search American Airlines flights
United AirlinesPriceFrom $174Free CancellationRating
7.4
9,267 reviews
Search United Airlines flights
SouthwestPriceFrom $205Free CancellationRating
8.0
4,282 reviews
Search Southwest flights
DeltaPriceFrom $236Free CancellationRating
7.9
8,178 reviews
Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from San Diego to Illinois?

It is quick and easy to find San Diego to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

Can I find flights from San Diego to Illinois with flexible booking policies on momondo?

Flights from San Diego to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from San Diego to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from San Diego.

I’m not ready to book a flight from San Diego to Illinois right now. Can momondo alert me if prices change?

If you are not ready to book a flight from San Diego to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.

An easier way to manage your Illinois trip

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