$345 Cheap Flights from Houston (HOU) to Sidney (SDY)

View $345 flight on Mon, Oct 13, 2025Opens in a new window

Popular airlines from Houston William Hobby Airport (HOU) to Sidney, MT (SDY-Sidney-Richland Municipal)

Cheap Flights from Houston to Sidney (HOU-SDY)

Prices were available within the past 7 days and start at $345 for one-way flights and $606 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Nov 5 - Sun, Nov 9
HOU
Houston
SDY
Sidney
$606 Roundtrip, found 4 days ago
$606
Roundtrip
found 4 days ago
Select American Airlines flight, departing Wed, Nov 5 from Houston to Sidney, returning Sun, Nov 9, priced at $606 found 4 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 $500
SDY
Sidney-Richland Municipal
CheapestClosest
Average driving time to city center3 min
Flights from $500
Flights from Houston (HOU) to Sidney (SDY)
Origin airport
William P. Hobby
Destination airport
Sidney-Richland Municipal
Roundtrip price
$605
Distance
1334 mi

Houston to Sidney Flights

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

 

The best time to book a flight from Houston to Sidney

Sunday is one of the best days to book for cheap flights from Houston 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 Houston 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 Houston to Sidney in 2025. You can also book with separate airlines for your outbound and return journeys, from $345 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 Houston 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 Houston 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 William P. Hobby Airport (HOU) to Sidney-Richland Municipal Airport (SDY) cost?
Snag a cheap one-way flight from $345 or cheap return flight from $606 from William P. Hobby Airport (HOU) 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 William P. Hobby Airport (HOU) to Sidney-Richland Municipal Airport (SDY)?
The cheapest month to fly from HOU to SDY is November, when demand is low. Off-peak months are generally when airlines offer better prices between these airports.
What is the cheapest airline that flies from William P. Hobby Airport (HOU) to Sidney-Richland Municipal Airport (SDY)?
To find the cheapest airline that'll fly you from HOU to SDY, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from William P. Hobby Airport (HOU) to Sidney-Richland Municipal Airport (SDY)?
There aren't any daily nonstop flights departing from William P. Hobby Airport (HOU) to Sidney-Richland Municipal Airport (SDY). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from HOU to SDY?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* However, this can change based on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from William P. Hobby Airport (HOU) to Sidney-Richland Municipal Airport (SDY)?
To reach Sidney-Richland Municipal Airport (SDY) without delays, book a flight that takes off from William P. Hobby Airport (HOU) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 William P. Hobby Airport (HOU) to Sidney-Richland Municipal Airport (SDY) last-minute?
Booking your plane ticket from HOU to SDY shortly before your getaway is typically more expensive. However, if there's some wiggle room with your departure times and dates, you could score a cheap last-minute fare.
Is it cheaper to book a HOU to SDY flight and hotel package?
Opting for a HOU to SDY flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Pick from our wide range of stays and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from William P. Hobby Airport (HOU) to Sidney-Richland Municipal Airport (SDY)?
It's generally possible to cancel or reschedule your HOU to SDY flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.