How does KAYAK find such low prices on flights from Illinois to San Diego?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to San Diego. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to San Diego?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Diego from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Illinois to San Diego?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Diego with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to San Diego?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Diego from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$63 CHEAP FLIGHTS from Illinois to San Diego

SAN

KAYAK searches hundreds of travel sites at once for deals on flights to San Diego

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Cheap Flights from Illinois to San Diego

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to San Diego

Tue, May 19 - Wed, May 27

6:51 pm - 3:31 pm

STL

SAN

22h 40m

2 stops

6:25 am - 7:23 pm

SAN

STL

10h 58m

1 stop

$174Frontier

Wed, May 27 - Sat, May 30

8:08 pm - 8:42 am

STL

SAN

14h 34m

1 stop

9:37 am - 7:23 pm

SAN

STL

7h 46m

1 stop

$177Frontier

Mon, May 18 - Sat, May 23

9:18 pm - 9:04 pm

STL

SAN

25h 46m

1 stop

6:25 am - 7:23 pm

SAN

STL

10h 58m

1 stop

$185Frontier

Sat, May 16 - Sat, May 23

7:59 pm - 10:36 pm

ORD

SAN

4h 37mnonstop

6:25 am - 7:55 am

SAN

ORD

23h 30m

2 stops

$234Multiple Airlines

Sat, May 23 - Sat, May 30

6:10 pm - 8:30 pm

MDW

SAN

4h 20mnonstop

10:40 pm - 4:35 am

SAN

MDW

3h 55mnonstop

$237Southwest

Sat, May 23 - Wed, Jun 3

7:59 pm - 10:36 pm

ORD

SAN

4h 37mnonstop

12:34 pm - 6:50 pm

SAN

ORD

4h 16mnonstop

$237Alaska Airlines

Thu, May 14 - Sat, May 30

9:30 am - 6:25 pm

ORD

SAN

10h 55m

1 stop

5:44 pm - 11:55 pm

SAN

ORD

4h 11mnonstop

$239Multiple Airlines

Sat, May 23 - Sat, Jun 6

6:15 am - 8:30 am

MDW

SAN

4h 15mnonstop

10:40 pm - 4:40 am

SAN

MDW

4h 00mnonstop

$247Southwest

Sat, May 23 - Sat, May 30

1:22 pm - 6:01 pm

MDW

SAN

6h 39m

1 stop

10:15 pm - 8:43 am

SAN

MDW

8h 28m

1 stop

$257Delta

Sat, May 23 - Wed, May 27

1:22 pm - 6:01 pm

MDW

SAN

6h 39m

1 stop

10:53 am - 9:09 pm

SAN

MDW

8h 16m

1 stop

$267Delta

Useful Info

Low season	January
High season	July
Cheapest flight	$63

Best time to beat the crowds with an average 9% drop in price.

Most popular time to fly and prices are also 1% lower on average.

Flight from St. Louis to San Diego

How does KAYAK find such low prices on flights from Illinois to San Diego?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to San Diego.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to San Diego?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Diego from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to San Diego?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Diego with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to San Diego?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Diego from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Julian

National City

Borrego Springs

Poway

Alpine

Lemon Grove

Santee

Everything you need to know for your flight to San Diego

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in San Diego

San Diego (SAN)

SAN

$63 Find Cheap Flights from Illinois to San Diego

KAYAK searches hundreds of travel sites at once for deals on flights to San Diego

Cheap Flights from Illinois to San Diego

Recent round-trip flight deals from Illinois to San Diego

Recent one-way flight deals from Illinois to San Diego

Recent last minute flight deals from Illinois to San Diego

Recent direct flight deals from Illinois to San Diego

Good to know

FAQs for booking flights from Illinois to San Diego

How does KAYAK find such low prices on flights from Illinois to San Diego?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to San Diego.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to San Diego?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Diego from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to San Diego?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Diego with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to San Diego?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Diego from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near San Diego?

Everything you need to know for your flight to San Diego

Information on the airport you'll fly into in San Diego

Cabin class types available on flights to Illinois

Complete your trip to San Diego with a hotel stay or car rental

Find direct flights for San Diego

Flights to other popular destinations

Flights from domestic origins to San Diego

Choose which airport to fly into in San Diego

Find deals for your return flight