SFO

$88 Find Cheap Flights from Illinois to San Francisco

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to San Francisco departing on 12/20. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$129
Overall average: $337
Frontier
Mon 1/26Fri 1/30
STL - SFO • 1 stop
Cheapest non-stop
$258
Typical prices: $289-$471
American Airlines
Sun 12/14Sun 1/18
ORD - SFO • Non-stop
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We hope you love your trip to San Francisco!
Flight Deals
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Flight Deals

Cheap Flights from Illinois to San Francisco

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to San Francisco that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Illinois to San Francisco

Mon, Jan 26 - Fri, Jan 30
Frontier Logo
1:40 pm - 12:28 amSTL-SFO
12h 48m1 stop
Frontier Logo
6:15 am - 6:44 pmSFO-STL
10h 29m1 stop
$129Frontier
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Sat, Jan 31 - Sat, Feb 7
Frontier Logo
3:46 pm - 11:41 pmSTL-SFO
9h 55m1 stop
Frontier Logo
7:00 am - 2:46 pmSFO-STL
5h 46m1 stop
$135Frontier
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Thu, Dec 18 - Sat, Jan 10
Multiple Airlines Logo
9:24 pm - 7:48 amMLI-SFO
12h 24m1 stop
Multiple Airlines Logo
4:13 pm - 8:36 pmSFO-MLI
26h 23m1 stop
$257Multiple Airlines
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Thu, Feb 19 - Sun, Feb 22
Southwest Logo
5:50 am - 12:15 pmMDW-SFO
8h 25m1 stop
Southwest Logo
5:55 am - 11:55 amSFO-MDW
4h 00mnonstop
$258Southwest
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Fri, Dec 12 - Sun, Jan 4
Delta Logo
7:02 pm - 12:19 amMDW-SFO
7h 17m1 stop
Delta Logo
12:40 am - 9:08 amSFO-MDW
6h 28m1 stop
$259Delta
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Fri, Dec 12 - Sun, Dec 14
Delta Logo
6:00 am - 1:33 pmORD-SFO
9h 33m1 stop
Delta Logo
12:30 am - 8:40 amSFO-ORD
6h 10m1 stop
$259Delta
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Wed, Dec 3 - Thu, Dec 11
Southwest Logo
5:15 am - 10:10 amMDW-SFO
6h 55m1 stop
Southwest Logo
7:40 am - 5:00 pmSFO-MDW
7h 20m1 stop
$262Southwest
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Wed, Dec 17 - Wed, Jan 7
American Airlines Logo
8:35 am - 11:26 amORD-SFO
4h 51mnonstop
American Airlines Logo
6:00 am - 12:25 pmSFO-ORD
4h 25mnonstop
$263American Airlines
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Fri, Dec 12 - Tue, Dec 16
American Airlines Logo
5:39 pm - 8:30 pmORD-SFO
4h 51mnonstop
American Airlines Logo
6:00 am - 12:24 pmSFO-ORD
4h 24mnonstop
$264American Airlines
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Thu, Dec 18 - Sat, Jan 10
Multiple Airlines Logo
9:24 pm - 7:48 amMLI-SFO
12h 24m1 stop
Multiple Airlines Logo
9:42 pm - 8:36 pmSFO-MLI
20h 54m2 stops
$302Multiple Airlines
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Useful Info

Good to know

Low seasonJanuary
Cheapest flight$88
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 11% increase in price.
Flight from St. Louis to San Francisco

FAQs for booking flights from Illinois to San Francisco

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

    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 Francisco.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco 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 Francisco?

    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 Francisco 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 Francisco?

    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 Francisco 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 Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Calistoga
Marina
Rohnert Park
Capitola
Emeryville
Pacifica
Millbrae
Campbell
Mill Valley
Newark
Novato
Windsor
Belmont
Union City
Richmond
West Sacramento
Los Altos
Corte Madera
Jenner
American Canyon

Everything you need to know for your flight to San Francisco

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

San Francisco (SFO)