Cheap flights from Illinois to San Francisco
Travel > North America > United States > Illinois to San Francisco flights
The aggressive Spanish colonial expansion during the 18th century finally reached the shores of San Francisco Bay in 1769. An expedition led by Don Gaspar de Portola was credited for discovering San Francisco Bay, sighting it atop Sweeney Ridge, now a National Historic Landmark. A member of his crew, Sgt. Jose Francisco Ortega would later be identified as having discovered the strait now popularly known as the Golden Gate.... (read more in our San Francisco History)
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Cheapest flights found for the next 6 months
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Check our newest flight offers to San Francisco:
- $160
Frontier Airlines
cheapoair.com check priceFrom To Departure Time Chicago, IL (ORD) San Francisco, CA (SFO) 04/25/2025 05:25 pm San Francisco, CA (SFO) Chicago, IL (ORD) 04/28/2025 11:38 pm - $178
Multiple Airlines
cheapoair.com check priceFrom To Departure Time Chicago, IL (ORD) San Francisco, CA (SFO) 04/25/2025 05:25 pm San Francisco, CA (SFO) Chicago, IL (ORD) 04/28/2025 05:52 pm - $236 Multiple Airlines
cheapoair.com check priceFrom To Departure Time Chicago, IL (ORD) San Francisco, CA (SFO) 03/30/2025 02:48 pm San Francisco, CA (SFO) Chicago, IL (ORD) 04/05/2025 06:55 pm - $245 Frontier Airlines
cheapoair.com check priceFrom To Departure Time Chicago, IL (ORD) San Francisco, CA (SFO) 03/30/2025 02:48 pm San Francisco, CA (SFO) Chicago, IL (ORD) 04/05/2025 08:18 pm - $357 Multiple Airlines
cheapoair.com check priceFrom To Departure Time Chicago, IL (MDW) San Francisco, CA (SFO) 03/30/2025 06:40 am San Francisco, CA (SFO) Chicago, IL (MDW) 04/05/2025 06:55 pm
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