$209+ Cheap flights from California to Sidney, MT (SDY)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/26. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — SDY
Jan 20 — Jan 271
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from California to Sidney
Best flights from California to SidneyDiscover carefully curated flight deals from California to Sidney that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 21, 2025.
Discover carefully curated flight deals from California to Sidney that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 21, 2025.
This Expedia deal was found by Cheapflights users on 12/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/197:57 amSFO - SDY
2 stops10h 54mMultiple Airlines
Mon 1/267:35 amSDY - SFO
2 stops13h 08mMultiple Airlines
Deal found 12/20![Multiple Airlines logo]()
$405
This Expedia deal was found by Cheapflights users on 12/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/278:00 amLAX - SDY
2 stops10h 51mMultiple Airlines
Mon 4/69:45 amSDY - LAX
2 stops11h 14mMultiple Airlines
Deal found 12/20![Multiple Airlines logo]()
$545
Find flight deals from California to Sidney
Keep the following information in mind while searching for California to Sidney flight deals. Data was last updated December 21, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $405 (Expedia) |
One-way from | $209 (Travelocity) |
Cheapflights Fare Finder
Customize your flight search to find flights from California to Sidney 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, Cheapflights users made 2,558,603 searches. Data last updated December 21, 2025.
Use the filters below to find and compare flights from California to Sidney that are best for you.
Fly from
California
Fly to
Sidney
Route
Depart
Return
Price
San FranciscoSidney
SFO - SDY
SFOSDY
San Francisco
Mon 1/19
7:57 am-7:51 pm
2 stops10h 54m
Sidney Richland Municipal
Mon 1/26
7:35 am-7:43 pm
2 stops13h 08m
$405
Los AngelesSidney
LAX - SDY
LAXSDY
Los Angeles
Fri 3/27
8:00 am-7:51 pm
2 stops10h 51m
Sidney Richland Municipal
Mon 4/6
9:45 am-7:59 pm
2 stops11h 14m
$545
Los AngelesSidney
LAX - SDY
LAXSDY
Los Angeles
Mon 1/26
2:56 pm-9:10 am
2 stops17h 14m
$209
Best time to book a flight from California to Sidney
Have a flexible travel schedule? Discover the best time to fly to Sidney from California with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from California to Sidney
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