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$746+ Cheap flights from San Francisco to Sidney, MT (SFO - SDY)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/17. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — SDY
mars 5 — mars 121
jeu. 3/5
jeu. 3/12
1 adult, Economy
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Cheap flight deals from San Francisco to Sidney

Cheapest flights from San Francisco to Sidney
Explore the most affordable flight options available from San Francisco to Sidney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on février 3, 2026.

This Expedia deal was found by Cheapflights users on 2/2. 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.
mar. 2/174:21 pm
SFO
-
SDY
2 stops15h 49m
Multiple Airlines
sam. 2/211:04 pm
SDY
-
SFO
2 stops7h 43m
Multiple Airlines
Deal found 2/2$746

Find flight deals from San Francisco to Sidney

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Sidney (SDY). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated février 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$746
(Expedia)
Provider with most accurate pricing for San Francisco-Sidney Richland Municipal flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Sidney Richland Municipal flights.
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From San Francisco to Sidney Richland Municipal
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Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco 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 février 3, 2026.
Use the filters below to find and compare flights from San Francisco to Sidney that are best for you.

Fly from

San Francisco

Fly to

Sidney

Route

Depart

Return

Price

San FranciscoSidney

SFO - SDY

SFOSDY

San Francisco

mar. 2/17

4:21 pm-9:10 am

2 stops15h 49m

Sidney Richland Municipal

sam. 2/21

1:04 pm-7:47 pm

2 stops7h 43m

$746

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/2

  • Most accurate provider: When it comes to deals on San Francisco-Sidney, Montana flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Francisco-Sidney, Montana flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Francisco-Sidney, Montana flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Francisco-Sidney, Montana flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Francisco-Sidney, Montana flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Francisco to Sidney

Have a flexible travel schedule? Discover the best time to fly to Sidney from San Francisco 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.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Sidney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find deals for flights from San Francisco to Sidney that include hotel bookings?

    Yes. In addition to deals on San Francisco to Sidney flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Sidney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Sidney.

  • Can I find deals for business class flights from San Francisco to Sidney?

    Yes. Cheapflights offers flight deals from San Francisco to Sidney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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