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Cheap flights from Illinois to San Diego from $52

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to San Diego departing on 2/7. 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 Illinois to San Diego

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:46 pm - 11:31 pm
STL
-
SAN
9h 45m1 stop
Frontier Logo
8:16 pm - 2:46 pm
SAN
-
STL
16h 30m1 stop
$109Frontier
Sat, Jan 31 - Fri, Feb 6
Frontier Logo
1:40 pm - 12:08 am
STL
-
SAN
12h 28m1 stop
Frontier Logo
8:16 pm - 2:46 pm
SAN
-
STL
16h 30m1 stop
$110Frontier
Mon, Feb 2 - Fri, Feb 6
Frontier Logo
1:40 pm - 12:08 am
STL
-
SAN
12h 28m1 stop
Frontier Logo
6:30 am - 6:44 pm
SAN
-
STL
10h 14m1 stop
$114Frontier
Mon, Jan 26 - Fri, Jan 30
Multiple Airlines Logo
8:20 am - 11:09 am
ORD
-
SAN
4h 49mnonstop
Multiple Airlines Logo
9:18 pm - 8:43 am
SAN
-
ORD
9h 25m1 stop
$159Multiple Airlines
Wed, Mar 4 - Sat, Mar 7
Multiple Airlines Logo
12:44 pm - 5:51 pm
ORD
-
SAN
31h 07m2 stops
Multiple Airlines Logo
8:00 am - 4:53 pm
SAN
-
ORD
6h 53m1 stop
$160Multiple Airlines
Tue, Feb 10 - Sat, Feb 14
Southwest Logo
8:05 am - 12:50 pm
MDW
-
SAN
6h 45m1 stop
Southwest Logo
6:30 pm - 12:25 am
SAN
-
MDW
3h 55mnonstop
$163Southwest
Tue, Feb 17 - Mon, Feb 23
United Airlines Logo
2:40 pm - 8:49 pm
ORD
-
SAN
8h 09m1 stop
United Airlines Logo
4:47 pm - 10:59 pm
SAN
-
ORD
4h 12mnonstop
$163United Airlines
Sat, Jan 31 - Mon, Feb 2
Southwest Logo
8:15 am - 10:50 am
MDW
-
SAN
4h 35mnonstop
Southwest Logo
6:25 am - 12:25 pm
SAN
-
MDW
4h 00mnonstop
$164Southwest
Wed, Feb 4 - Wed, Feb 11
Alaska Airlines Logo
3:07 pm - 5:52 pm
ORD
-
SAN
4h 45mnonstop
Alaska Airlines Logo
5:42 pm - 11:59 pm
SAN
-
ORD
4h 17mnonstop
$167Alaska Airlines
Fri, Feb 20 - Mon, Feb 23
United Airlines Logo
10:46 am - 3:39 pm
MLI
-
SAN
6h 53m1 stop
United Airlines Logo
10:59 am - 7:02 pm
SAN
-
MLI
6h 03m1 stop
$280United Airlines
Thu, Feb 26 - Tue, Mar 3

Frontier flights from Illinois to San Diego

Our best Frontier deals on Illinois to San Diego flight tickets
Frontier
Jan 31
STL3:46 pmLambert-St Louis
9h 45m
1 stop
SAN11:31 pmSan Diego
Feb 6
SAN8:16 pmSan Diego
16h 30m
1 stop
STL2:46 pmLambert-St Louis
$109
Frontier
Feb 2
STL1:40 pmLambert-St Louis
12h 28m
1 stop
SAN12:08 amSan Diego
Feb 6
SAN8:16 pmSan Diego
16h 30m
1 stop
STL2:46 pmLambert-St Louis
$110
Frontier
Jan 26
STL1:40 pmLambert-St Louis
12h 28m
1 stop
SAN12:08 amSan Diego
Jan 30
SAN6:30 amSan Diego
10h 14m
1 stop
STL6:44 pmLambert-St Louis
$114

Southwest flights from Illinois to San Diego

Our best Southwest deals on Illinois to San Diego flight tickets
Southwest
Feb 17
MDW8:05 amChicago Midway
6h 45m
1 stop
SAN12:50 pmSan Diego
Feb 23
SAN6:30 pmSan Diego
3h 55m
MDW12:25 amChicago Midway
$163
Southwest
Feb 4
MDW8:15 amChicago Midway
4h 35m
SAN10:50 amSan Diego
Feb 11
SAN6:25 amSan Diego
4h 00m
MDW12:25 pmChicago Midway
$164
Southwest
Jan 29
MDW7:50 pmChicago Midway
4h 30m
SAN10:20 pmSan Diego
Feb 2
SAN7:35 amSan Diego
7h 40m
1 stop
MDW5:15 pmChicago Midway
$167

momondo Fare Finder

 
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, momondo users made 832,500 searches. Data last updated January 8, 2026.
Use the filters below to find and compare flights from Illinois to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 1/31

3:46 pm-11:31 pm

1 stop9h 45m

San Diego

Fri 2/6

8:16 pm-2:46 pm

1 stop16h 30m

$109

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Mon 2/2

1:40 pm-12:08 am

1 stop12h 28m

San Diego

Fri 2/6

8:16 pm-2:46 pm

1 stop16h 30m

$110

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Mon 1/26

1:40 pm-12:08 am

1 stop12h 28m

San Diego

Fri 1/30

6:30 am-6:44 pm

1 stop10h 14m

$114

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Wed 3/4

8:20 am-11:09 am

Nonstop4h 49m

San Diego

Sat 3/7

9:18 pm-8:43 am

1 stop9h 25m

$159

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Tue 2/10

12:44 pm-5:51 pm

2 stops31h 07m

San Diego

Sat 2/14

8:00 am-4:53 pm

1 stop6h 53m

$160

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Tue 2/17

8:05 am-12:50 pm

1 stop6h 45m

San Diego

Mon 2/23

6:30 pm-12:25 am

Nonstop3h 55m

$163

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Sat 1/31

2:40 pm-8:49 pm

1 stop8h 09m

San Diego

Mon 2/2

4:47 pm-10:59 pm

Nonstop4h 12m

$163

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Wed 2/4

8:15 am-10:50 am

Nonstop4h 35m

San Diego

Wed 2/11

6:25 am-12:25 pm

Nonstop4h 00m

$164

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Fri 2/20

3:07 pm-5:52 pm

Nonstop4h 45m

San Diego

Mon 2/23

5:42 pm-11:59 pm

Nonstop4h 17m

$167

MolineSan Diego

MLI - SAN

MLISAN

Moline Quad-City

Thu 2/26

10:46 am-3:39 pm

1 stop6h 53m

San Diego

Tue 3/3

10:59 am-7:02 pm

1 stop6h 03m

$280

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 San Diego from

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

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 San Diego?

If you are unable to visit San Diego during the month of October, then departing from Illinois during the month January is also very affordable. Most momondo users find prices during this month for around $229.

What is the cheapest day to depart on your flight to San Diego?

The cheapest day to depart from Illinois to San Diego is on a Friday. Travelers who choose to depart for San Diego on a Friday will often find tickets for as low as $291. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $373. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

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

The cheapest time of day to fly to San Diego is at noon when flights can be purchased for as low as $264. Flights in the afternoon are often more expensive with an average ticket price of $364.

What is the cheapest Illinois to San Diego flight route?

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

How far in advance should I book a flight to San Diego?

You are more likely to see cheaper flights to San Diego from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $300 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from Illinois for as low as $241 on momondo.

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

There are 4 cabin classes available to choose from on Illinois to San Diego 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 Illinois to San Diego flights?

You could potentially save up to 2% on your flight if you consider stops on a Illinois to San Diego flight.

Cheap Illinois to San Diego flight deals and tips

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

Best Price Found

$126

Fastest flight time

3h 40m

Direct flights

Every day

Airports in San Diego

1 airport
The best one-way flight to San Diego from Illinois in the past 72 hours is $126. The best round-trip flight deal from Illinois to San Diego found on momondo in the last 72 hours is $196.
The fastest flight from Illinois to San Diego takes 3h 40m
Direct flights go from Illinois to San Diego every day.
There is 1 airport in San Diego. From Illinois there are direct flights to San Diego (SAN).
Search flight deals

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

    Prices for flights from Illinois to San Diego Airport were last updated today.

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

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

    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 Illinois to San Diego Airport.

  • What documentation or ID do you need to fly to San Diego Airport?

    The required travel and health documents for your San Diego Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at San Diego Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

Best airlines flying from Illinois to San Diego

Compare and see reviews for airlines that fly from Illinois to San Diego with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $84Free CancellationRating
6.3
8,289 reviews
Search Spirit Airlines flights
FrontierPriceFrom $103Free CancellationRating
5.7
3,061 reviews
Search Frontier flights
Alaska AirlinesPriceFrom $142Free CancellationRating
8.0
11,668 reviews
Search Alaska Airlines flights
Hawaiian AirlinesPriceFrom $153Free CancellationRating
7.8
2,824 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $160Free CancellationRating
7.4
9,142 reviews
Search United Airlines flights
American AirlinesPriceFrom $161Free CancellationRating
7.2
11,095 reviews
Search American Airlines flights
SouthwestPriceFrom $172Free CancellationRating
8.0
4,250 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
8,031 reviews
Search Delta flights

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
Coronado
Chula Vista
El Cajon
Julian
Poway
National City
Imperial Beach
Borrego Springs
La Mesa
San Ysidro
Alpine
Lemon Grove
Santee

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to San Diego. momondo saves you time and could save you money on your trip.

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

momondo does allow users to show only those flights to San Diego from Illinois which offer a flexible booking policy as well as other useful filters and features.

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

Once all potential Illinois to San Diego flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of Illinois to San Diego flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your San Diego trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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