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Cheap flights from San Diego to Illinois from $81

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 6/3. 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
6:25 am - 7:23 pm
SAN
-
STL
10h 58m
1 stop
Frontier Logo
8:08 pm - 11:50 pm
STL
-
SAN
5h 42m
1 stop
$192Frontier
Tue, Jun 2 - Sat, Jun 6
Frontier Logo
6:25 am - 7:23 pm
SAN
-
STL
10h 58m
1 stop
Frontier Logo
7:46 pm - 8:48 am
STL
-
SAN
15h 02m
1 stop
$210Frontier
Tue, Jun 9 - Tue, Jun 16
United Airlines Logo
2:08 pm - 8:28 pm
SAN
-
ORD
4h 20mnonstop
United Airlines Logo
8:46 am - 11:21 am
ORD
-
SAN
4h 35mnonstop
$247United Airlines
Wed, Jun 3 - Tue, Jun 9
Southwest Logo
10:40 pm - 4:35 am
SAN
-
MDW
3h 55mnonstop
Southwest Logo
8:40 pm - 10:55 pm
MDW
-
SAN
4h 15mnonstop
$247Southwest
Tue, Jun 2 - Sat, Jun 6
Southwest Logo
10:40 pm - 4:35 am
SAN
-
MDW
3h 55mnonstop
Southwest Logo
8:40 pm - 10:55 pm
MDW
-
SAN
4h 15mnonstop
$252Southwest
Tue, Jun 2 - Sat, Jun 6
American Airlines Logo
1:07 pm - 12:41 am
SAN
-
MLI
9h 34m
1 stop
American Airlines Logo
6:50 pm - 11:26 pm
MLI
-
SAN
6h 36m
1 stop
$313American Airlines
Wed, Jul 15 - Tue, Jul 21
American Airlines Logo
12:45 pm - 11:30 pm
SAN
-
MLI
8h 45m
2 stops
American Airlines Logo
6:50 pm - 11:26 pm
MLI
-
SAN
6h 36m
1 stop
$318American Airlines
Wed, Jul 15 - Tue, Jul 21
United Airlines Logo
2:15 pm - 10:43 pm
SAN
-
PIA
6h 28m
1 stop
United Airlines Logo
3:35 pm - 10:10 pm
PIA
-
SAN
8h 35m
1 stop
$349United Airlines
Thu, Aug 13 - Mon, Aug 17
Delta Logo
12:50 pm - 10:23 pm
SAN
-
BMI
7h 33m
1 stop
Delta Logo
4:00 pm - 11:03 pm
BMI
-
SAN
9h 03m
1 stop
$359Delta
Tue, Oct 13 - Mon, Oct 19
Delta Logo
9:46 am - 11:01 pm
SAN
-
BMI
11h 15m
2 stops
Delta Logo
4:24 pm - 11:00 pm
BMI
-
SAN
8h 36m
1 stop
$364Delta
Thu, Aug 13 - Mon, Aug 17

American Airlines flights from San Diego to Illinois

Our best American Airlines deals on San Diego to Illinois flight tickets
American Airlines
May 31
SAN6:15 amSan Diego
4h 25m
ORD12:40 pmChicago O'Hare Intl
Jun 6
ORD6:45 amChicago O'Hare Intl
4h 30m
SAN9:15 amSan Diego
$278
American Airlines
May 24
SAN7:28 amSan Diego
4h 23m
ORD1:51 pmChicago O'Hare Intl
Jun 2
ORD6:59 pmChicago O'Hare Intl
4h 30m
SAN9:29 pmSan Diego
$297
American Airlines
May 27
SAN9:57 amSan Diego
4h 26m
ORD4:23 pmChicago O'Hare Intl
Jun 2
ORD6:45 amChicago O'Hare Intl
4h 19m
SAN9:04 amSan Diego
$298

Frontier flights from San Diego to Illinois

Our best Frontier deals on San Diego to Illinois flight tickets
Frontier
Jun 2
SAN6:25 amSan Diego
10h 58m
1 stop
STL7:23 pmLambert-St Louis
Jun 6
STL8:08 pmLambert-St Louis
5h 42m
1 stop
SAN11:50 pmSan Diego
$192
Frontier
Jun 9
SAN6:25 amSan Diego
10h 58m
1 stop
STL7:23 pmLambert-St Louis
Jun 16
STL7:46 pmLambert-St Louis
15h 02m
1 stop
SAN8:48 amSan Diego
$210
Frontier
Jun 16
SAN9:43 amSan Diego
7h 08m
1 stop
STL6:51 pmLambert-St Louis
Jun 24
STL8:08 pmLambert-St Louis
15h 01m
1 stop
SAN9:09 amSan Diego
$211

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 May 13, 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

Cheapest round-trip

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Tue 6/2

6:25 am-7:23 pm

1 stop10h 58m

Lambert-St Louis

Sat 6/6

8:08 pm-11:50 pm

1 stop5h 42m

$192

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Tue 6/9

6:25 am-7:23 pm

1 stop10h 58m

Lambert-St Louis

Tue 6/16

7:46 pm-8:48 am

1 stop15h 02m

$210

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 6/3

2:08 pm-8:28 pm

Nonstop4h 20m

Chicago O'Hare Intl

Tue 6/9

8:46 am-11:21 am

Nonstop4h 35m

$247
Quickest round-trip

San DiegoChicago

SAN - MDW

SANMDW

San Diego

Tue 6/2

10:40 pm-4:35 am

Nonstop3h 55m

Chicago Midway

Sat 6/6

8:40 pm-10:55 pm

Nonstop4h 15m

$247

San DiegoChicago

SAN - MDW

SANMDW

San Diego

Tue 6/2

10:40 pm-4:35 am

Nonstop3h 55m

Chicago Midway

Sat 6/6

8:40 pm-10:55 pm

Nonstop4h 15m

$252

San DiegoMoline

SAN - MLI

SANMLI

San Diego

Wed 7/15

1:07 pm-12:41 am

1 stop9h 34m

Moline Quad-City

Tue 7/21

6:50 pm-11:26 pm

1 stop6h 36m

$313

San DiegoMoline

SAN - MLI

SANMLI

San Diego

Wed 7/15

12:45 pm-11:30 pm

2 stops8h 45m

Moline Quad-City

Tue 7/21

6:50 pm-11:26 pm

1 stop6h 36m

$318

San DiegoPeoria

SAN - PIA

SANPIA

San Diego

Thu 8/13

2:15 pm-10:43 pm

1 stop6h 28m

Greater Peoria

Mon 8/17

3:35 pm-10:10 pm

1 stop8h 35m

$349

San DiegoBloomington

SAN - BMI

SANBMI

San Diego

Tue 10/13

12:50 pm-10:23 pm

1 stop7h 33m

Bloomington-Normal

Mon 10/19

4:00 pm-11:03 pm

1 stop9h 03m

$359

San DiegoBloomington

SAN - BMI

SANBMI

San Diego

Thu 8/13

9:46 am-11:01 pm

2 stops11h 15m

Bloomington-Normal

Mon 8/17

4:24 pm-11:00 pm

1 stop8h 36m

$364

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 February. Flight prices, which tend to average around $91, 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 February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $103.

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 Friday when prices can be found for as low as $357. Flights from San Diego to Illinois on a Sunday will generally be more expensive and average around $529. 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 $274. Flights at noon are often more expensive with an average ticket price of $430.

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 from San Diego 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 $292 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 $249 on momondo.

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

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

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

$179

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 $179. The best round-trip flight deal from San Diego to Illinois found on momondo in the last 72 hours is $347.
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

Frequently asked questions about flying from San Diego to Illinois

  • 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
FrontierPriceFrom $51Free CancellationRating
5.6
2,953 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $139Free CancellationRating
7.8
2,837 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $150Free CancellationRating
7.9
12,361 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $157Free CancellationRating
7.1
11,664 reviews
Search American Airlines flights
United AirlinesPriceFrom $166Free CancellationRating
7.4
9,711 reviews
Search United Airlines flights
SouthwestPriceFrom $205Free CancellationRating
8.0
4,299 reviews
Search Southwest 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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Find better results for your trip to Illinois

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