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Cheap flights from Illinois to San Francisco from $77

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 Francisco departing on 4/20. 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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0 bags

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Find the cheapest flights from Illinois to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:06 pm - 6:37 pm
STL
-
SFO
24h 31m
1 stop
Frontier Logo
6:00 am - 9:49 am
SFO
-
STL
25h 49m
1 stop
$201Frontier
Tue, Mar 17 - Tue, Mar 24
Frontier Logo
8:12 pm - 9:08 am
STL
-
SFO
14h 56m
1 stop
Frontier Logo
3:31 pm - 7:12 pm
SFO
-
STL
25h 41m
2 stops
$202Frontier
Thu, Apr 23 - Wed, Apr 29
Multiple Airlines Logo
8:06 pm - 9:38 pm
STL
-
SFO
27h 32m
2 stops
Multiple Airlines Logo
9:04 pm - 9:49 am
SFO
-
STL
10h 45m
1 stop
$216Multiple Airlines
Tue, Mar 10 - Tue, Mar 17
Southwest Logo
1:35 pm - 9:55 pm
MDW
-
SFO
10h 20m
2 stops
Southwest Logo
6:05 am - 3:25 pm
SFO
-
MDW
7h 20m
1 stop
$242Southwest
Mon, Mar 2 - Wed, Mar 4
Southwest Logo
10:05 am - 3:15 pm
MDW
-
SFO
7h 10m
1 stop
Southwest Logo
5:40 am - 11:40 am
SFO
-
MDW
4h 00mnonstop
$245Southwest
Tue, Mar 17 - Tue, Mar 24
Multiple Airlines Logo
4:16 pm - 12:28 am
ORD
-
SFO
10h 12m
1 stop
Multiple Airlines Logo
8:25 am - 9:39 am
SFO
-
ORD
23h 14m
2 stops
$245Multiple Airlines
Thu, Feb 26 - Tue, Mar 3
Delta Logo
1:29 pm - 6:36 pm
MDW
-
SFO
7h 07m
1 stop
Delta Logo
11:35 pm - 9:56 am
SFO
-
MDW
8h 21m
1 stop
$247Delta
Sat, Mar 7 - Mon, Mar 9
Delta Logo
7:25 am - 4:03 pm
ORD
-
SFO
10h 38m
1 stop
Delta Logo
5:50 am - 4:43 pm
SFO
-
ORD
8h 53m
1 stop
$247Delta
Thu, Mar 12 - Tue, Mar 17
American Airlines Logo
6:00 am - 11:02 am
PIA
-
SFO
7h 02m
1 stop
American Airlines Logo
5:32 am - 5:08 pm
SFO
-
PIA
9h 36m
1 stop
$309American Airlines
Tue, Apr 14 - Sat, Apr 18
American Airlines Logo
5:00 am - 9:40 am
BMI
-
SFO
6h 40m
1 stop
American Airlines Logo
6:00 am - 2:26 pm
SFO
-
BMI
6h 26m
1 stop
$309American Airlines
Wed, Mar 11 - Wed, Mar 18

Frontier flights from Illinois to San Francisco

Our best Frontier deals on Illinois to San Francisco flight tickets
Frontier
Mar 17
STL8:06 pmLambert-St Louis
24h 31m
1 stop
SFO6:37 pmSan Francisco
Mar 24
SFO6:00 amSan Francisco
25h 49m
1 stop
STL9:49 amLambert-St Louis
$201
Frontier
Apr 23
STL8:12 pmLambert-St Louis
14h 56m
1 stop
SFO9:08 amSan Francisco
Apr 29
SFO3:31 pmSan Francisco
25h 41m
2 stops
STL7:12 pmLambert-St Louis
$202
Frontier
Mar 16
STL8:12 pmLambert-St Louis
25h 57m
1 stop
SFO8:09 pmSan Francisco
Mar 23
SFO6:41 pmSan Francisco
37h 08m
2 stops
STL9:49 amLambert-St Louis
$203

Southwest flights from Illinois to San Francisco

Our best Southwest deals on Illinois to San Francisco flight tickets
Southwest
Mar 2
MDW1:35 pmChicago Midway
10h 20m
2 stops
SFO9:55 pmSan Francisco
Mar 4
SFO6:05 amSan Francisco
7h 20m
1 stop
MDW3:25 pmChicago Midway
$242
Southwest
Mar 17
MDW10:05 amChicago Midway
7h 10m
1 stop
SFO3:15 pmSan Francisco
Mar 24
SFO5:40 amSan Francisco
4h 00m
MDW11:40 amChicago Midway
$245
Southwest
Mar 12
MDW9:25 pmChicago Midway
4h 40m
SFO12:05 amSan Francisco
Mar 17
SFO11:25 pmSan Francisco
4h 05m
MDW5:30 amChicago Midway
$250

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to San Francisco 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 February 12, 2026.
Use the filters below to find and compare flights from Illinois to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Tue 3/17

8:06 pm-6:37 pm

1 stop24h 31m

San Francisco

Tue 3/24

6:00 am-9:49 am

1 stop25h 49m

$201

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Thu 4/23

8:12 pm-9:08 am

1 stop14h 56m

San Francisco

Wed 4/29

3:31 pm-7:12 pm

2 stops25h 41m

$202

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Tue 3/10

8:06 pm-9:38 pm

2 stops27h 32m

San Francisco

Tue 3/17

9:04 pm-9:49 am

1 stop10h 45m

$216

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Mon 3/2

1:35 pm-9:55 pm

2 stops10h 20m

San Francisco

Wed 3/4

6:05 am-3:25 pm

1 stop7h 20m

$242

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 3/17

10:05 am-3:15 pm

1 stop7h 10m

San Francisco

Tue 3/24

5:40 am-11:40 am

Nonstop4h 00m

$245

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 2/26

4:16 pm-12:28 am

1 stop10h 12m

San Francisco

Tue 3/3

8:25 am-9:39 am

2 stops23h 14m

$245

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 3/7

1:29 pm-6:36 pm

1 stop7h 07m

San Francisco

Mon 3/9

11:35 pm-9:56 am

1 stop8h 21m

$247

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 3/12

7:25 am-4:03 pm

1 stop10h 38m

San Francisco

Tue 3/17

5:50 am-4:43 pm

1 stop8h 53m

$247

PeoriaSan Francisco

PIA - SFO

PIASFO

Greater Peoria

Tue 4/14

6:00 am-11:02 am

1 stop7h 02m

San Francisco

Sat 4/18

5:32 am-5:08 pm

1 stop9h 36m

$309

BloomingtonSan Francisco

BMI - SFO

BMISFO

Bloomington-Normal

Wed 3/11

5:00 am-9:40 am

1 stop6h 40m

San Francisco

Wed 3/18

6:00 am-2:26 pm

1 stop6h 26m

$309

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 Francisco from

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

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 Francisco?

If you aren’t able to travel to San Francisco during the month of July, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $288.

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

The cheapest day to depart from Illinois to San Francisco is on a Thursday when prices can be found for as low as $356. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $542.

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

Our data shows that the cheapest Illinois to San Francisco flights are usually those with departure times in the evening. Our users have found flights to San Francisco in the evening for as low as $382. Flights in the afternoon are often more expensive with an average ticket price of $505.

What is the cheapest Illinois to San Francisco flight route?

Fly from Chicago Midway to San Francisco for the best Illinois - San Francisco flight prices

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

You are more likely to see cheaper flights to San Francisco from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $336 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Illinois for as low as $266 on momondo.

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

There are 4 cabin classes available to choose from on Illinois to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Illinois to San Francisco flight deals and tips

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

Best Price Found

$141

Fastest flight time

4h 05m

Direct flights

Every day

Airports in San Francisco

1 airport
The best one-way flight to San Francisco from Illinois in the past 72 hours is $141. The best round-trip flight deal from Illinois to San Francisco found on momondo in the last 72 hours is $283.
The fastest flight from Illinois to San Francisco takes 4h 05m
Direct flights go from Illinois to San Francisco every day.
There is 1 airport in San Francisco. From Illinois there are direct flights to San Francisco (SFO).
Search flight deals

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

    Prices for flights from Illinois to San Francisco Airport refresh daily.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to San Francisco Airport.

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

    The required travel and health documents for your San Francisco 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 Francisco 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 Francisco?

Best airlines flying from Illinois to San Francisco

Compare and see reviews for airlines that fly from Illinois to San Francisco with momondo
Airline
Rating
Free Cancellation
Price
Hawaiian AirlinesPriceFrom $108Free CancellationRating
7.8
2,833 reviews
Search Hawaiian Airlines flights
FrontierPriceFrom $110Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
Sun Country AirPriceFrom $112Free CancellationRating
6.8
342 reviews
Search Sun Country Air flights
DeltaPriceFrom $128Free CancellationRating
7.9
8,187 reviews
Search Delta flights
SouthwestPriceFrom $138Free CancellationRating
8.0
4,283 reviews
Search Southwest flights
JetBluePriceFrom $183Free CancellationRating
7.2
2,896 reviews
Search JetBlue flights
Alaska AirlinesPriceFrom $186Free CancellationRating
8.0
11,880 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $197Free CancellationRating
7.2
11,277 reviews
Search American Airlines flights
United AirlinesPriceFrom $207Free CancellationRating
7.4
9,283 reviews
Search United Airlines flights

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Carmel-by-the-Sea
Modesto
Sonoma
Bodega Bay
Roseville
Hayward
Walnut Creek
Santa Clara
Calistoga
Berkeley
Big Sur
Fremont
Daly City
Half Moon Bay
Salinas
Vallejo
Sunnyvale
Milpitas
Turlock

Why use momondo?

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

It is quick and easy to find Illinois to San Francisco 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 San Francisco that suits you.

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

Yes. momondo allows you to filter the results for Illinois to San Francisco flights to just show those with flexible booking policies.

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

Once you have performed a search for Illinois to San Francisco flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to San Francisco from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your San Francisco trip

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