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Cheap flights from Illinois to San Diego from $72

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 10/25. 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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Cheap round-trip flights

Alaska Airlines Logo
10:00 am - 1:00 pmORD-SAN
5h 00mnonstop
Alaska Airlines Logo
5:49 pm - 11:59 pmSAN-ORD
4h 10mnonstop
$134Alaska Airlines
Find Deal
Sat, Oct 25 - Sat, Nov 1
Frontier Logo
6:00 am - 11:50 pmORD-SAN
19h 50m1 stop
Frontier Logo
6:58 am - 7:38 pmSAN-ORD
10h 40m1 stop
$135Frontier
Find Deal
Mon, Nov 10 - Tue, Nov 18
Alaska Airlines Logo
2:59 pm - 5:24 pmORD-SAN
4h 25mnonstop
Alaska Airlines Logo
5:00 pm - 11:10 pmSAN-ORD
4h 10mnonstop
$139Alaska Airlines
Find Deal
Sat, Jan 31 - Sat, Feb 7
Hawaiian Airlines Logo
10:00 am - 1:00 pmORD-SAN
5h 00mnonstop
Hawaiian Airlines Logo
5:49 pm - 11:59 pmSAN-ORD
4h 10mnonstop
$143Hawaiian Airlines
Find Deal
Sat, Oct 25 - Sat, Nov 1
Hawaiian Airlines Logo
3:50 pm - 6:50 pmORD-SAN
5h 00mnonstop
Hawaiian Airlines Logo
5:49 pm - 11:59 pmSAN-ORD
4h 10mnonstop
$144Hawaiian Airlines
Find Deal
Sat, Oct 25 - Sat, Nov 1
Frontier Logo
7:52 pm - 11:50 pmSTL-SAN
5h 58m1 stop
Frontier Logo
8:11 am - 7:26 pmSAN-STL
9h 15m1 stop
$144Frontier
Find Deal
Fri, Oct 24 - Mon, Oct 27
Southwest Logo
1:50 pm - 4:05 pmMDW-SAN
4h 15mnonstop
Southwest Logo
4:50 pm - 10:50 pmSAN-MDW
4h 00mnonstop
$153Southwest
Find Deal
Sat, Oct 25 - Sat, Nov 1
Southwest Logo
8:25 pm - 10:45 pmMDW-SAN
4h 20mnonstop
Southwest Logo
6:55 am - 1:00 pmSAN-MDW
4h 05mnonstop
$163Southwest
Find Deal
Tue, Oct 21 - Sat, Oct 25
American Airlines Logo
11:50 am - 2:10 pmORD-SAN
4h 20mnonstop
American Airlines Logo
6:16 am - 12:40 pmSAN-ORD
4h 24mnonstop
$163American Airlines
Find Deal
Tue, Oct 21 - Sat, Oct 25
American Airlines Logo
11:43 am - 2:13 pmORD-SAN
4h 30mnonstop
American Airlines Logo
8:07 am - 2:15 pmSAN-ORD
4h 08mnonstop
$187American Airlines
Find Deal
Thu, Jan 1 - Wed, Jan 7

Alaska Airlines flights from Illinois to San Diego

Our best Alaska Airlines deals on Illinois to San Diego flight tickets
Alaska Airlines
Oct 25
ORD10:00 amChicago O'Hare Intl
5h 00m
SAN1:00 pmSan Diego
Nov 1
SAN5:49 pmSan Diego
4h 10m
ORD11:59 pmChicago O'Hare Intl
$134
Find similar
Alaska Airlines
Jan 31
ORD2:59 pmChicago O'Hare Intl
4h 25m
SAN5:24 pmSan Diego
Feb 7
SAN5:00 pmSan Diego
4h 10m
ORD11:10 pmChicago O'Hare Intl
$139
Find similar
Alaska Airlines
Oct 15
ORD7:59 pmChicago O'Hare Intl
5h 00m
SAN10:59 pmSan Diego
Oct 20
SAN5:19 pmSan Diego
4h 40m
ORD11:59 pmChicago O'Hare Intl
$142
Find similar

Hawaiian Airlines flights from Illinois to San Diego

Our best Hawaiian Airlines deals on Illinois to San Diego flight tickets
Hawaiian Airlines
Oct 25
ORD10:00 amChicago O'Hare Intl
5h 00m
SAN1:00 pmSan Diego
Nov 1
SAN5:49 pmSan Diego
4h 10m
ORD11:59 pmChicago O'Hare Intl
$143
Find similar
Hawaiian Airlines
Oct 25
ORD3:50 pmChicago O'Hare Intl
5h 00m
SAN6:50 pmSan Diego
Nov 1
SAN5:49 pmSan Diego
4h 10m
ORD11:59 pmChicago O'Hare Intl
$144
Find similar
Hawaiian Airlines
Oct 25
ORD10:00 amChicago O'Hare Intl
5h 00m
SAN1:00 pmSan Diego
Nov 1
SAN5:49 pmSan Diego
4h 10m
ORD11:59 pmChicago O'Hare Intl
$145
Find similar

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 September 23, 2025.
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

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Sat 10/25

10:00 am-1:00 pm

Nonstop5h 00m

San Diego

Sat 11/1

5:49 pm-11:59 pm

Nonstop4h 10m

$134

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Mon 11/10

6:00 am-11:50 pm

1 stop19h 50m

San Diego

Tue 11/18

6:58 am-7:38 pm

1 stop10h 40m

$135

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Sat 1/31

2:59 pm-5:24 pm

Nonstop4h 25m

San Diego

Sat 2/7

5:00 pm-11:10 pm

Nonstop4h 10m

$139

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Sat 10/25

10:00 am-1:00 pm

Nonstop5h 00m

San Diego

Sat 11/1

5:49 pm-11:59 pm

Nonstop4h 10m

$143

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Sat 10/25

3:50 pm-6:50 pm

Nonstop5h 00m

San Diego

Sat 11/1

5:49 pm-11:59 pm

Nonstop4h 10m

$144

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Fri 10/24

7:52 pm-11:50 pm

1 stop5h 58m

San Diego

Mon 10/27

8:11 am-7:26 pm

1 stop9h 15m

$144

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Sat 10/25

1:50 pm-4:05 pm

Nonstop4h 15m

San Diego

Sat 11/1

4:50 pm-10:50 pm

Nonstop4h 00m

$153

ChicagoSan Diego

MDW - SAN

MDWSAN

Chicago Midway

Tue 10/21

8:25 pm-10:45 pm

Nonstop4h 20m

San Diego

Sat 10/25

6:55 am-1:00 pm

Nonstop4h 05m

$163

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Tue 10/21

11:50 am-2:10 pm

Nonstop4h 20m

San Diego

Sat 10/25

6:16 am-12:40 pm

Nonstop4h 24m

$163

ChicagoSan Diego

ORD - SAN

ORDSAN

Chicago O'Hare Intl

Thu 1/1

11:43 am-2:13 pm

Nonstop4h 30m

San Diego

Wed 1/7

8:07 am-2:15 pm

Nonstop4h 08m

$187

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 August, then departing from Illinois during the month September is also very affordable. Most momondo users find prices during this month for around $263.

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 Thursday. Travelers who choose to depart for San Diego on a Thursday will often find tickets for as low as $356. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $457. 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 $285. Flights in the afternoon are often more expensive with an average ticket price of $449.

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 $362 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 $284 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?

No. A direct flight is the cheapest option for a flight between Illinois to San Diego.

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

$99

Fastest flight time

3h 45m

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 $99. The best round-trip flight deal from Illinois to San Diego found on momondo in the last 72 hours is $178.
The fastest flight from Illinois to San Diego takes 3h 45m
Direct flights go from Illinois to San Diego every day.
There is 1 airport near San Diego: 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 $93Free CancellationRating
6.3
8,041 reviews
Search Spirit Airlines flights
FrontierPriceFrom $102Free CancellationRating
5.8
3,165 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $138Free CancellationRating
7.8
2,744 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $139Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $161Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $192Free CancellationRating
8.0
4,244 reviews
Search Southwest flights
United AirlinesPriceFrom $203Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
DeltaPriceFrom $223Free CancellationRating
7.9
7,974 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
La Mesa
National City
Poway
Imperial Beach
San Ysidro
Borrego Springs
Lemon Grove
Alpine
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

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