The cheapest times to fly from HNL to SDY are

  • January 8th to March 4th
  • April 9th to May 6th
  • August 6th to November 11th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from HNL to SDY is late January. Prices can be as high as $1373 for Saturday flights during early to mid December, or as low as $643 for Tuesday flights around late January.


When to Fly to Sidney

Flying from Honolulu, HI (HNL) to Sidney, MT (SDY) will usually cost between $701 to $1102 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January with an average ticket price of $708. Due to high demand the most expensive time to fly is early to mid December, with an average price of $1148. Planning your trip to low-cost times can easily save you $440 on economy flights and even more on first-class flights. Generally, any price below $859 can be considered a good price for a round-trip HNL to SDY flight.

See below for a graph of average weekly prices for the HNL to SDY route. All prices are for round-trip tickets in USD.

HNL to SDY Flight Prices

Compared to other flights, the HNL to SDY flight is cheaper than the average and costs less than the average flight leaving from Honolulu. The average price per mile (for a direct flight) is $0.15, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $124 (12%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $840. Return trip prices are from the SDY to HNL flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from HNL to SDY can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 7 hour 14 minutes may not be realistic.


Flight Hacking HNL to SDY

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from HNL to SDY — but Champion Traveler does!

Hack #1: Billings, MT (HNL > BIL > SDY)

  • Price for both tickets: $740
  • Average savings: $120 (13.91%)

See HNL to BIL flights


Flight Questions Answered

Still have questions about flying from HNL to SDY? We’ve got answers.

Which airlines fly this route?

You can find 5 major airlines flying this route most often: Alaska, American, Cape Air, Delta, United, and potentially more during busy seasons.

How far away is it from Sidney Richland Regional Airport to Daniel K Inouye International Airport?

The distance between the two airports is roughly 3469 miles or 5583 kilometers.

How long does it take to fly from HNL to SDY?

The real-world flight time for a nonstop HNL to SDY flight is about 7 hour 14 minutes.

How many flights go between Honolulu, HI and Sidney, MT?

It depends on the day of the week and the date, but a typical day might have around 18 available flights from HNL to SDY.


Airport Location Info


Departing Airport

Origination codeHNL
Origination airport nameDaniel K Inouye International Airport
CityHonolulu, HI
Countrythe United States

Return Airport

Destination codeSDY
Destination airport nameSidney Richland Regional Airport
CitySidney, MT
Countrythe United States


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.