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Cheap flights from Washington, D.C. to Sidney from $522

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Sidney departing on 8/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. to Sidney (WAS-SDY)

Cheap round-trip flights

Logo
7:00 am - 7:38 pmIAD-SDY
14h 38m2 stops
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12:52 pm - 7:33 amSDY-IAD
16h 41m2 stops
$995
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Wed, Sep 3 - Sun, Sep 7

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Sidney, Montana 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, momondo users made 832,500 searches. Data last updated August 21, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Sidney, Montana that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Sidney

IAD - SDY

IADSDY

Washington, D.C. Dulles Intl

Wed 9/3

7:00 am-7:38 pm

2 stops14h 38m

Sidney Richland Municipal

Sun 9/7

12:52 pm-7:33 am

2 stops16h 41m

$995

Washington, D.C.Sidney

IAD - SDY

IADSDY

Washington, D.C. Dulles Intl

Sat 8/30

7:00 am-7:38 pm

2 stops14h 38m

$522

Washington, D.C.Sidney

IAD - SDY

IADSDY

Washington, D.C. Dulles Intl

Sat 8/30

7:00 am-7:38 pm

2 stops14h 38m

$603

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Washington, D.C. to Sidney, Montana

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Sidney, Montana according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. to Sidney, Montana (WAS to SDY) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Sidney, Montana

Direct flights

None
There are no direct flights from Washington, D.C. to Sidney, Montana. There are no popular flight routes from Washington, D.C. to Sidney, Montana.
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  • How far is Washington, D.C. to Sidney Richland Municipal by plane?

    A flight from Washington, D.C. to Sidney Richland Municipal will travel around 1482.2 mi. By plane, this route typically takes 14h 38m.

  • When did momondo last update prices for flights from Washington, D.C. to Sidney Richland Municipal Airport?

    Prices for flights from Washington, D.C. to Sidney Richland Municipal Airport were last updated today.

  • How old do you have to be to fly from Washington, D.C. to Sidney Richland Municipal Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to Sidney Richland Municipal Airport.

  • What documentation or ID do you need to fly to Sidney Richland Municipal Airport?

    The necessary travel and health documents for your Sidney Richland Municipal Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • How do I get Price Alerts for flights from Washington, D.C. to Sidney, Montana?

    Search flight deals from Washington, D.C. to Sidney, Montana. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from Washington, D.C. to Sidney, Montana with momondo?

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Sidney?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Sidney from Washington, D.C..

Can I find flights from Washington, D.C. to Sidney with flexible booking policies on momondo?

Flights from Washington, D.C. to Sidney with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Washington, D.C. to Sidney?

momondo provides multiple filters to help you find the best flight to Sidney from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Washington, D.C. to Sidney right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Washington, D.C. to Sidney now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Sidney and let you know when they change.

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