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Cheap flights from Washington, D.C. Dulles Intl Airport to Sidney from $655

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Sidney departing on 12/3. 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. Dulles Intl Airport to Sidney

Cheap round-trip flights

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Multiple Airlines Logo
12:45 pm - 2:17 pmIAD-SDY
27h 32m2 stops
Multiple Airlines Logo
9:45 am - 11:15 pmSDY-IAD
11h 30m2 stops
$655Multiple Airlines
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qua, dez 3 - qua, dez 10

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport 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 novembro 5, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport 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

qua 12/3

12:45 pm-2:17 pm

2 stops27h 32m

Sidney Richland Municipal

qua 12/10

9:45 am-11:15 pm

2 stops11h 30m

$655

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Sidney, Montana (IAD to SDY) flight deals and tips

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

Direct flights

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

    There are 1461.9 mi between Washington, D.C. Dulles Intl and Sidney Richland Municipal. By plane, this route typically takes 27h 32m.

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

    Prices for flights from Washington, D.C. Dulles Intl Airport to Sidney Richland Municipal Airport are updated daily.

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Sidney Richland Municipal Airport.

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

    The travel and health documents required for your trip to Sidney Richland Municipal Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sidney Richland Municipal Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Washington, D.C. Dulles Intl Airport from Sidney, Montana. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

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

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington, D.C. to Sidney. Millions of users trust and use momondo every year so you are in good hands.

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

All flight searches from Washington, D.C. to Sidney on momondo can be filtered to show those which offer flexible booking policies.

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?

Yes. momondo can track prices for Washington, D.C. to Sidney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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1 adult
sex 12/5
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