$629+ 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 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SDY
Feb 22 — Mar 11
1 adult, Economy
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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 January 23, 2026.
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 January 23, 2026.
This Expedia deal was found by Cheapflights users on 1/22. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/134:21 pm
DEN
- SDY
2 stops16h 49m
Multiple Airlines
Fri 4/177:35 am
SDY
- DEN
2 stops16h 21m
Multiple Airlines
Deal found 1/22![Multiple Airlines logo]()
$629
Find 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 January 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 1 star |
Round-trip from | $629 (Expedia) |
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 January 23, 2026.
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
Mon 4/13
4:21 pm-9:10 am
2 stops16h 49m
Sidney Richland Municipal
Fri 4/17
7:35 am-11:56 pm
2 stops16h 21m
$629
- Most accurate provider: When it comes to deals on Denver-Sidney, Montana flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-Sidney, Montana flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Denver-Sidney, Montana flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Denver-Sidney, Montana flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-Sidney, Montana flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.