$316+ Cheap flights from Denver to Sidney, MT (DEN - SDY)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SDY
oct. 17 — oct. 241
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Denver to Sidney
Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Sidney (SDY). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated septiembre 17, 2025.
Round-trip from | $316 (United) |
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Find flight deals from Denver to Sidney
Cheapest flights from Denver to SidneyExplore the most affordable flight options available from Denver to Sidney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 17, 2025.
Explore the most affordable flight options available from Denver to Sidney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 17, 2025.
This United deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/177:15 pmDEN - SDY
1 stop21h 30mMultiple Airlines
dom. 10/197:35 amSDY - DEN
1 stop12h 08mMultiple Airlines
Deal found 9/15![Multiple Airlines logo]()
$316
This lastminute.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/17:00 amDEN - SDY
2 stops37h 51mMultiple Airlines
sáb. 11/82:42 pmSDY - DEN
2 stops23h 59mMultiple Airlines
Deal found 9/17![Multiple Airlines logo]()
$522
Cheapflights Fare Finder
Customize your flight search to find flights from Denver to Sidney 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, Cheapflights users made 2,558,603 searches. Data last updated septiembre 17, 2025.
Use the filters below to find and compare flights from Denver to Sidney that are best for you.
Fly from
Denver
Fly to
Sidney
Route
Depart
Return
Price
DenverSidney
DEN - SDY
DENSDY
Denver Intl
vie. 10/17
7:15 pm-4:45 pm
1 stop21h 30m
Sidney Richland Municipal
dom. 10/19
7:35 am-7:43 pm
1 stop12h 08m
$316
DenverSidney
DEN - SDY
DENSDY
Denver Intl
sáb. 11/1
7:00 am-8:51 pm
2 stops37h 51m
Sidney Richland Municipal
sáb. 11/8
2:42 pm-2:41 pm
2 stops23h 59m
$522
Best time to book a flight from Denver to Sidney
Have a flexible travel schedule? Discover the best time to fly to Sidney from Denver with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.