$204 Cheap Flights from Las Vegas (LAS) to Sidney (SDY)

View $204 flight on Wed, Dec 10, 2025Opens in a new window

Popular airlines from Harry Reid Intl. Airport (LAS) to Sidney, MT (SDY-Sidney-Richland Municipal)

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Cheap Flights from Las Vegas to Sidney (LAS-SDY)

Prices were available within the past 7 days and start at $204 for one-way flights and $398 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Dec 18 - Sat, Jan 3
LAS
Las Vegas
SDY
Sidney
$398 Roundtrip, found 22 hours ago
$398
Roundtrip
found 22 hours ago
Select Delta flight, departing Thu, Dec 18 from Las Vegas to Sidney, returning Sat, Jan 3, priced at $398 found 22 hours ago
United
Tue, Jan 13 - Tue, Jan 27
LAS
Las Vegas
SDY
Sidney
$403 Roundtrip, found 5 days ago
$403
Roundtrip
found 5 days ago
Select United flight, departing Tue, Jan 13 from Las Vegas to Sidney, returning Tue, Jan 27, priced at $403 found 5 days ago
Alaska Airlines
Tue, Dec 16 - Wed, Dec 31
LAS
Las Vegas
SDY
Sidney
$407 Roundtrip, found 22 hours ago
$407
Roundtrip
found 22 hours ago
Select Alaska Airlines flight, departing Tue, Dec 16 from Las Vegas to Sidney, returning Wed, Dec 31, priced at $407 found 22 hours ago
United
Tue, Jan 13 - Tue, Jan 27
LAS
Las Vegas
SDY
Sidney
$408 Roundtrip, found 5 days ago
$408
Roundtrip
found 5 days ago
Select United flight, departing Tue, Jan 13 from Las Vegas to Sidney, returning Tue, Jan 27, priced at $408 found 5 days ago
United
Thu, Dec 25 - Wed, Dec 31
LAS
Las Vegas
SDY
Sidney
$417 Roundtrip, found 6 days ago
$417
Roundtrip
found 6 days ago
Select United flight, departing Thu, Dec 25 from Las Vegas to Sidney, returning Wed, Dec 31, priced at $417 found 6 days ago
Delta
Thu, Dec 18 - Sun, Dec 21
LAS
Las Vegas
SDY
Sidney
$427 Roundtrip, found 22 hours ago
$427
Roundtrip
found 22 hours ago
Select Delta flight, departing Thu, Dec 18 from Las Vegas to Sidney, returning Sun, Dec 21, priced at $427 found 22 hours ago
United
Thu, Nov 20 - Mon, Nov 24
LAS
Las Vegas
SDY
Sidney
$433 Roundtrip, found 18 hours ago
$433
Roundtrip
found 18 hours ago
Select United flight, departing Thu, Nov 20 from Las Vegas to Sidney, returning Mon, Nov 24, priced at $433 found 18 hours ago
United
Wed, Dec 17 - Wed, Dec 31
LAS
Las Vegas
SDY
Sidney
$436 Roundtrip, found 6 days ago
$436
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 17 from Las Vegas to Sidney, returning Wed, Dec 31, priced at $436 found 6 days ago
Alaska Airlines
Tue, Dec 16 - Sun, Jan 4
LAS
Las Vegas
SDY
Sidney
$436 Roundtrip, found 22 hours ago
$436
Roundtrip
found 22 hours ago
Select Alaska Airlines flight, departing Tue, Dec 16 from Las Vegas to Sidney, returning Sun, Jan 4, priced at $436 found 22 hours ago
Delta
Mon, Nov 17 - Mon, Nov 24
LAS
Las Vegas
SDY
Sidney
$438 Roundtrip, found 18 hours ago
$438
Roundtrip
found 18 hours ago
Select Delta flight, departing Mon, Nov 17 from Las Vegas to Sidney, returning Mon, Nov 24, priced at $438 found 18 hours ago
Alaska Airlines
Tue, Dec 16 - Sun, Jan 4
LAS
Las Vegas
SDY
Sidney
$442 Roundtrip, found 2 days ago
$442
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Dec 16 from Las Vegas to Sidney, returning Sun, Jan 4, priced at $442 found 2 days ago
United
Wed, Dec 17 - Thu, Jan 1
LAS
Las Vegas
SDY
Sidney
$446 Roundtrip, found 6 days ago
$446
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 17 from Las Vegas to Sidney, returning Thu, Jan 1, priced at $446 found 6 days ago

Alternative airports near Sidney

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sidney-Richland Municipal SDY. Cheapest and Closest option available. Average driving time to city center is 3 minutes. Flights from $462
SDY
Sidney-Richland Municipal
CheapestClosest
Average driving time to city center3 min
Flights from $462
Flights from Las Vegas (LAS) to Sidney (SDY)
Origin airport
Harry Reid Intl.
Destination airport
Sidney-Richland Municipal
Roundtrip price
$397
Distance
979 mi

Las Vegas to Sidney Flights

The cheapest times to fly from Las Vegas 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 Las Vegas to Sidney are during the month of December. You can find some of the cheapest flights from Las Vegas to Sidney with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Las Vegas to Sidney

Sunday is one of the best days to book for cheap flights from Las Vegas 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 Las Vegas 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 Las Vegas to Sidney in 2025. You can also book with separate airlines for your outbound and return journeys, from $204 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 Las Vegas 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 Las Vegas 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.

 

Frequently asked questions

How much does a flight from Harry Reid Intl. Airport (LAS) to Sidney-Richland Municipal Airport (SDY) cost?
Get a cheap one-way flight from $204 or cheap return flight from $398 from Harry Reid Intl. Airport (LAS) 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 Harry Reid Intl. Airport (LAS) to Sidney-Richland Municipal Airport (SDY)?
December is the most affordable month to fly from LAS to SDY. Planning your trip for the off-season is often the key to scoring lower fares.
What is the cheapest airline that flies from Harry Reid Intl. Airport (LAS) to Sidney-Richland Municipal Airport (SDY)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest LAS to SDY flight.
How many flights per day from Harry Reid Intl. Airport (LAS) to Sidney-Richland Municipal Airport (SDY)?
Nonstop flights from Harry Reid Intl. Airport (LAS) 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 our filter tool. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from LAS to SDY?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can change based on a range of factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Harry Reid Intl. Airport (LAS) to Sidney-Richland Municipal Airport (SDY)?
To land at Sidney-Richland Municipal Airport (SDY) on time, book a flight that leaves Harry Reid Intl. Airport (LAS) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 Harry Reid Intl. Airport (LAS) to Sidney-Richland Municipal Airport (SDY) last-minute?
Last-minute fares from LAS to SDY are typically more expensive. For the best prices, start looking for flights ahead of time. That being said, if you can play around with your travel dates, you may land a cheap fare right before your journey.
Is it cheaper to book a LAS to SDY flight and hotel package?
Compared with arranging flights and hotels separately, booking a LAS to SDY flight and hotel package with Expedia could result in significant savings. What's more, having it all in one place takes the hassle out of planning your trip. Simply pick your flights and choose from our wide range of hotels, then personalize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Harry Reid Intl. Airport (LAS) to Sidney-Richland Municipal Airport (SDY)?
In most cases, you're able to cancel or reschedule your LAS to SDY flight. However, additional charges may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's policies and fees on flight changes, or if you'd like more information, go to our Customer Service portal.

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*Available to One Key members.