$315 Cheap Flights from San Jose (SJC) to Sidney (SDY)

View $315 flight on Wed, Oct 22, 2025Opens in a new window

Popular airlines from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney, MT (SDY-Sidney-Richland Municipal)

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Cheap Flights from San Jose to Sidney (SJC-SDY)

Prices were available within the past 7 days and start at $315 for one-way flights and $716 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Fri, Oct 24 - Tue, Oct 28
SJC
San Jose
SDY
Sidney
$716 Roundtrip, found 2 days ago
$716
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri, Oct 24 from San Jose to Sidney, returning Tue, Oct 28, priced at $716 found 2 days ago
Alaska Airlines
Fri, Oct 24 - Tue, Oct 28
SJC
San Jose
SDY
Sidney
$787 Roundtrip, found 2 days ago
$787
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri, Oct 24 from San Jose to Sidney, returning Tue, Oct 28, priced at $787 found 2 days ago
Alaska Airlines
Wed, Oct 22 - Sun, Oct 26
SJC
San Jose
SDY
Sidney
$885 Roundtrip, found 3 days ago
$885
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Oct 22 from San Jose to Sidney, returning Sun, Oct 26, priced at $885 found 3 days ago
Alaska Airlines
Wed, Oct 22 - Sun, Oct 26
SJC
San Jose
SDY
Sidney
$895 Roundtrip, found 3 days ago
$895
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Oct 22 from San Jose to Sidney, returning Sun, Oct 26, priced at $895 found 3 days ago

Frequently asked questions

How much does a flight from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY) cost?
Snag a cheap one-way flight from $315 or cheap return flight from $716 from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY)?
Planning your getaway for October is a good way to save, as it's the cheapest month for flights between SJC and SDY. You'll often find the lowest fares during the off-season.
What is the cheapest airline that flies from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY)?
To find the cheapest airline that'll fly you from SJC to SDY, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY)?
Direct flights from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel details and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SJC to SDY?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can change based on a number of factors, including the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY)?
Book a flight from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY) that takes off before 3 PM to reduce the likelihood of delays. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY) last-minute?
Last-minute bookings from SJC to SDY are typically more expensive. To secure the lowest prices, start searching for flights ahead of time. That said, if you're flexible with your travel plans, you may score a cheap fare right before you leave.
Is it cheaper to book a SJC to SDY flight and hotel package?
You'll typically save money by securing a SJC to SDY flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After selecting your preferred accommodations and flights, consider adding extras like car rentals, activities and tours.
Can I cancel or change the date of my flight from Norman Y. Mineta San Jose Intl. Airport (SJC) to Sidney-Richland Municipal Airport (SDY)?
If you reserved your SJC to SDY flight within the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Norman Y. Mineta San Jose Intl.
Destination airport
Sidney-Richland Municipal
Roundtrip price
$716
Distance
1146 mi

Book with confidence

San Jose to Sidney Flights

The cheapest times to fly from San Jose to Sidney

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Jose to Sidney are during the month of October. You can find some of the cheapest flights from San Jose to Sidney with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Jose to Sidney

Sunday is one of the best days to book for cheap flights from San Jose to Sidney: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Jose to Sidney

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Jose to Sidney in 2025. You can also book with separate airlines for your outbound and return journeys, from $315 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Jose to Sidney flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Jose to Sidney airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Jose to Sidney Flights

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*Available to One Key members.