$444 Cheap Flights from New Orleans (MSY) to Sidney (SDY)

View $444 flight on Fri, May 16, 2025Opens in a new window

Popular airlines from Louis Armstrong New Orleans Intl. Airport (MSY) to Sidney, MT (SDY-Sidney-Richland Municipal)

Find available prices by choosing your travel dates.

Cheap Flights from New Orleans to Sidney (MSY-SDY)

Prices were available within the past 7 days and start at $444 for one-way flights and $598 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Jun 10 - Fri, Jun 20
MSY
New Orleans
SDY
Sidney
$598 Roundtrip, found 3 days ago
$598
Roundtrip
found 3 days ago
Select United flight, departing Tue, Jun 10 from New Orleans to Sidney, returning Fri, Jun 20, priced at $598 found 3 days ago
United
Tue, Jun 10 - Fri, Jun 20
MSY
New Orleans
SDY
Sidney
$599 Roundtrip, found 3 days ago
$599
Roundtrip
found 3 days ago
Select United flight, departing Tue, Jun 10 from New Orleans to Sidney, returning Fri, Jun 20, priced at $599 found 3 days ago
Flights from New Orleans (MSY) to Sidney (SDY)
Origin airport
Louis Armstrong New Orleans Intl.
Destination airport
Sidney-Richland Municipal
Roundtrip price
$597
Distance
1430 mi

New Orleans to Sidney Flights

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

The best time to book a flight from New Orleans to Sidney

Sunday is one of the best days to book for cheap flights from New Orleans 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 New Orleans 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 New Orleans to Sidney in 2025. You can also book with separate airlines for your outbound and return journeys, from $444 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 New Orleans 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 New Orleans 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

Is it cheaper to buy a plane ticket from Louis Armstrong New Orleans Intl. Airport (MSY) to SDY last minute?
When it’s time to book your flights, being organized pays off. While it’s possible to score a last-minute deal on a MSY to SDY flight, tickets usually don’t get cheaper as the date of departure nears. Based on flight pricing and demand studies in 2022, we have found that the sweet spot to book a domestic flight is between 28 – 35 days in advance. For international flights it’s between three and four months.
What airports do you fly into for Sidney from New Orleans?
From New Orleans, you can reach Sidney via Sidney-Richland Municipal Airport (SDY), Dawson Community Airport (GDV) and Basin Intl. Airport (XWA). Do some research into which hub is the right option for you before you make a decision. If you opt for Sidney-Richland Municipal Airport (SDY), it’s roughly 1 mi west of downtown. Use the money you save when booking your journey with Expedia to visit the city’s popular sights, such as Sidney Country Club and MonDak Heritage Center.
Can I change the date of my flight from Louis Armstrong New Orleans Intl. Airport to SDY?
You can quickly make changes to your Louis Armstrong New Orleans Intl. Airport to Sidney-Richland Municipal Airport (SDY) trip through the Expedia Trips portal. But before you make any amendments, check the conditions in your itinerary to find out what you’re able to do and what charges may apply. Some airlines have a change fee per person, plus any difference in prices. But if you booked in the last 24 hours, you may be able to cancel for free and organize new flights. You can also take a look at our Customer Service portal for more useful advice and to chat with our Virtual Agent.

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*Available to One Key members.