What is the cheapest airline that flies from Illinois to San Diego?

Spirit Airlines, Southwest, and Alaska Airlines are the most popular carriers operating from Illinois to San Diego

How many flights depart from Illinois to San Diego on average per day?

46 flights are operational daily from Illinois to San Diego as of July 2025. The most popular departure time for this route is 9:00PM, with 40% of flights per day taking off in the afternoon.

What airlines fly to San Diego?

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to San Diego from Illinois according to our data. American Airlines is the first choice among our users, with 57% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 7 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

How many flights depart from Illinois to San Diego on average per week?

As of July 2025, there are 327 flights per week flying from Illinois to San Diego. The most common day of the week flights depart is Sun, with 16% of flights taking off on this day.

How long does it take to fly to San Diego?

On average, it takes 4h 12m to fly from Illinois to San Diego if you fly out of Chicago (the most popular airport in Illinois) and into San Diego (the most popular airport in San Diego). If you’re flying out of Peoria and into San Diego, then the flight time is around 5h 52m.

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?

As of July 2025, there are 7 operators available to choose from 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.

$41 Cheap Flights from Illinois to San Diego in 2025

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Illinois to San Diego

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

5:35 pm - 11:37 pmORD-SAN

8h 02m1 stop

7:01 pm - 4:50 amSAN-ORD

7h 49m1 stop

$78Spirit Airlines

Find Deal

Sat, Aug 16 - Wed, Aug 20

6:21 pm - 7:21 amORD-SAN

15h 00m1 stop

7:01 pm - 4:50 amSAN-ORD

7h 49m1 stop

$86Spirit Airlines

Find Deal

Tue, Aug 19 - Wed, Aug 20

7:00 am - 9:18 amORD-SAN

4h 18mnonstop

1:17 pm - 7:41 pmSAN-ORD

4h 24mnonstop

$134American Airlines

Find Deal

Wed, Sep 10 - Wed, Sep 10

8:25 pm - 10:45 pmMDW-SAN

4h 20mnonstop

4:50 pm - 10:50 pmSAN-MDW

4h 00mnonstop

$139Southwest

Find Deal

Tue, Oct 7 - Sat, Oct 11

1:30 pm - 3:50 pmORD-SAN

4h 20mnonstop

10:30 pm - 4:37 amSAN-ORD

4h 07mnonstop

$139United Airlines

Find Deal

Tue, Aug 19 - Wed, Aug 20

7:05 am - 9:24 amORD-SAN

4h 19mnonstop

1:08 pm - 7:25 pmSAN-ORD

4h 17mnonstop

$140American Airlines

Find Deal

Sat, Aug 23 - Sat, Aug 30

7:05 pm - 9:20 pmMDW-SAN

4h 15mnonstop

7:30 am - 1:30 pmSAN-MDW

4h 00mnonstop

$148Southwest

Find Deal

Tue, Aug 19 - Sat, Aug 23

1:39 pm - 3:59 pmORD-SAN

4h 20mnonstop

4:44 pm - 11:07 pmSAN-ORD

4h 23mnonstop

$149Frontier

Find Deal

Tue, Aug 12 - Mon, Aug 18

4:13 pm - 6:35 pmORD-SAN

4h 22mnonstop

10:20 pm - 4:30 amSAN-ORD

4h 10mnonstop

$154United Airlines

Find Deal

Tue, Aug 12 - Tue, Aug 12

1:39 pm - 3:59 pmORD-SAN

4h 20mnonstop

4:44 pm - 11:07 pmSAN-ORD

4h 23mnonstop

$159Frontier

Find Deal

Tue, Aug 5 - Wed, Aug 6

Southwest flights from Illinois to San Diego

Our best Southwest deals on Illinois to San Diego flight tickets

Southwest

Oct 7

MDW8:25 pmChicago Midway

4h 20m

SAN10:45 pmSan Diego

Oct 11

SAN4:50 pmSan Diego

4h 00m

MDW10:50 pmChicago Midway

$139

Find similar

Southwest

Aug 19

MDW7:05 pmChicago Midway

4h 15m

SAN9:20 pmSan Diego

Aug 23

SAN7:30 amSan Diego

4h 00m

MDW1:30 pmChicago Midway

$148

Find similar

Southwest

Aug 20

MDW7:05 pmChicago Midway

4h 15m

SAN9:20 pmSan Diego

Aug 27

SAN9:10 amSan Diego

6h 00m

1 stop

MDW5:10 pmChicago Midway

$158

Find similar

American Airlines flights from Illinois to San Diego

Our best American Airlines deals on Illinois to San Diego flight tickets

American Airlines

Sep 10

ORD7:00 amChicago O'Hare Intl

4h 18m

SAN9:18 amSan Diego

Sep 10

SAN1:17 pmSan Diego

4h 24m

ORD7:41 pmChicago O'Hare Intl

$134

Find similar

American Airlines

Aug 23

ORD7:05 amChicago O'Hare Intl

4h 19m

SAN9:24 amSan Diego

Aug 30

SAN1:08 pmSan Diego

4h 17m

ORD7:25 pmChicago O'Hare Intl

$140

Find similar

American Airlines

Aug 12

ORD7:25 amChicago O'Hare Intl

4h 19m

SAN9:44 amSan Diego

Aug 26

SAN1:08 pmSan Diego

4h 17m

ORD7:25 pmChicago O'Hare Intl

$148

Find similar

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

Prices

Airlines

Other information

What is the cheapest month to fly to San Diego?

If you are unable to visit San Diego during the month of July, then departing from Illinois during the month June is also very affordable. Most momondo users find prices during this month for around $297.

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 Wednesday. Travelers who choose to depart for San Diego on a Wednesday will often find tickets for as low as $395. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $471. 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 $298. Flights in the evening are often more expensive with an average ticket price of $455.

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 $386 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 $301 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	$41
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 $41. The best round-trip flight deal from Illinois to San Diego found on momondo in the last 72 hours is $78.

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?
As of July 2025, there are 7 operators available to choose from 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?
momondo data reveals that the most frequently booked plane model on the route from Illinois to San Diego is Boeing 737-800, representing 32.04% of all bookings. The subsequent popular models are Airbus A321neo at 13.24%, Airbus A321-100/200 at 12.99%, and Boeing 737-900 at 10.10%.

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 Airlines	PriceFrom $103	Free Cancellation	Rating 6.3 8,029 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $108	Free Cancellation	Rating 5.9 3,244 reviews	Search Frontier flights
Alaska Airlines	PriceFrom $143	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $192	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Southwest	PriceFrom $218	Free Cancellation	Rating 8.0 4,232 reviews	Search Southwest flights
Delta	PriceFrom $240	Free Cancellation	Rating 8.0 7,962 reviews	Search Delta flights
United Airlines	PriceFrom $254	Free Cancellation	Rating 7.4 8,868 reviews	Search United Airlines flights

Coronado

El Cajon

Chula Vista

Julian

National City

La Mesa

Imperial Beach

San Ysidro

Poway

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

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.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Sat 7/26

Sat 8/2

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Airports servicing California

Popular cities in the United States

Flights to New Yorkfrom $47

Flights to Los Angelesfrom $42

Flights to Miamifrom $43

Flights to Chicagofrom $52

Flights to Las Vegasfrom $38

Flights to Orlandofrom $58

Flights to San Franciscofrom $59

Flights to Washington, D.C.from $56

Flights to Bostonfrom $67

Flights to Dallasfrom $61

Flights to Atlantafrom $44

Flights to Seattlefrom $61

Cheap flights from Illinois to San Diego from $41

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 8/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Illinois to San Diego

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Southwest flights from Illinois to San Diego

Our best Southwest deals on Illinois to San Diego flight tickets

American Airlines flights from Illinois to San Diego

Our best American Airlines deals on Illinois to San Diego flight tickets

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 July, then departing from Illinois during the month June is also very affordable. Most momondo users find prices during this month for around $297.

What is the cheapest day to depart on your flight 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 $298. Flights in the evening are often more expensive with an average ticket price of $455.

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?

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.

What is the cheapest airline that flies from Illinois to San Diego?

Spirit Airlines, Southwest, and Alaska Airlines are the most popular carriers operating from Illinois to San Diego

What airlines fly to San Diego?

How many flights depart from Illinois to San Diego on average per day?

46 flights are operational daily from Illinois to San Diego as of July 2025. The most popular departure time for this route is 9:00PM, with 40% of flights per day taking off in the afternoon.

How many flights depart from Illinois to San Diego on average per week?

As of July 2025, there are 327 flights per week flying from Illinois to San Diego. The most common day of the week flights depart is Sun, with 16% of flights taking off on this day.

How long does it take to fly to San Diego?

On average, it takes 4h 12m to fly from Illinois to San Diego if you fly out of Chicago (the most popular airport in Illinois) and into San Diego (the most popular airport in San Diego). If you’re flying out of Peoria and into San Diego, then the flight time is around 5h 52m.

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

Fastest flight time

Direct flights

Airports in San Diego

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

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?

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

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

Traveling to a place near San Diego?

Why use momondo?

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

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

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

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

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing California