$393 Cheap Flights from Honolulu (HNL) to Sidney (SDY)

View $393 flight on Thu, Jan 29, 2026Opens in a new window

Popular airlines from Daniel K. Inouye Intl. Airport (HNL) to Sidney, MT (SDY-Sidney-Richland Municipal)

Cheap Flights from Honolulu to Sidney (HNL-SDY)

Prices were available within the past 7 days and start at $393 for one-way flights and $964 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Dec 29 - Sun, Jan 4
HNL
Oahu
SDY
Sidney
$964 Roundtrip, found 4 hours ago
$964
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Mon, Dec 29 from Oahu to Sidney, returning Sun, Jan 4, priced at $964 found 4 hours ago
Alaska Airlines
Mon, Dec 29 - Sun, Jan 4
HNL
Oahu
SDY
Sidney
$979 Roundtrip, found 6 days ago
$979
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Dec 29 from Oahu to Sidney, returning Sun, Jan 4, priced at $979 found 6 days ago
Alaska Airlines
Mon, Dec 29 - Sun, Jan 4
HNL
Oahu
SDY
Sidney
$1,004 Roundtrip, found 1 day ago
$1,004
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Mon, Dec 29 from Oahu to Sidney, returning Sun, Jan 4, priced at $1,004 found 1 day ago
Alaska Airlines
Mon, Apr 13 - Fri, Apr 17
HNL
Oahu
SDY
Sidney
$1,045 Roundtrip, found 6 days ago
$1,045
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Apr 13 from Oahu to Sidney, returning Fri, Apr 17, priced at $1,045 found 6 days ago
Alaska Airlines
Mon, Apr 13 - Fri, Apr 17
HNL
Oahu
SDY
Sidney
$1,050 Roundtrip, found 6 days ago
$1,050
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Apr 13 from Oahu to Sidney, returning Fri, Apr 17, priced at $1,050 found 6 days ago
Alaska Airlines
Mon, Apr 13 - Fri, Apr 17
HNL
Oahu
SDY
Sidney
$1,055 Roundtrip, found 6 days ago
$1,055
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Apr 13 from Oahu to Sidney, returning Fri, Apr 17, priced at $1,055 found 6 days ago
Alaska Airlines
Mon, Apr 13 - Fri, Apr 17
HNL
Oahu
SDY
Sidney
$1,060 Roundtrip, found 6 days ago
$1,060
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Apr 13 from Oahu to Sidney, returning Fri, Apr 17, priced at $1,060 found 6 days ago
United
Mon, Dec 29 - Sun, Jan 4
HNL
Oahu
SDY
Sidney
$1,079 Roundtrip, found 1 day ago
$1,079
Roundtrip
found 1 day ago
Select United flight, departing Mon, Dec 29 from Oahu to Sidney, returning Sun, Jan 4, priced at $1,079 found 1 day ago
Alaska Airlines
Mon, Apr 13 - Fri, Apr 17
HNL
Oahu
SDY
Sidney
$1,082 Roundtrip, found 6 days ago
$1,082
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Apr 13 from Oahu to Sidney, returning Fri, Apr 17, priced at $1,082 found 6 days ago
Alaska Airlines
Mon, Apr 13 - Fri, Apr 17
HNL
Oahu
SDY
Sidney
$1,087 Roundtrip, found 6 days ago
$1,087
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Apr 13 from Oahu to Sidney, returning Fri, Apr 17, priced at $1,087 found 6 days ago

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Flights from Honolulu (HNL) to Sidney (SDY)
Origin airport
Daniel K. Inouye Intl.
Destination airport
Sidney-Richland Municipal
Roundtrip price
$963
Distance
3469 mi

Honolulu to Sidney Flights

The cheapest times to fly from Honolulu to Sidney

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Honolulu to Sidney are during the month of December. You can find some of the cheapest flights from Honolulu to Sidney with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Honolulu to Sidney

Sunday is one of the best days to book for cheap flights from Honolulu to Sidney: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Honolulu to Sidney

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Honolulu to Sidney in 2026. You can also book with separate airlines for your outbound and return journeys, from $393 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Honolulu to Sidney flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Honolulu to Sidney airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY) cost?
Lock in a cheap one-way flight from $393 or cheap return flight from $964 from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY)?
The cheapest month to fly from HNL to SDY is December, when demand is low. Off-peak season is often when better flight deals are available between these airports.
What is the cheapest airline that flies from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll fly you from HNL to SDY. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY)?
You'll have to catch a flight with a layover when traveling from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY). There are no daily direct flights on this route. However, just filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from HNL to SDY?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* But this can vary based on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY)?
To touch down at Sidney-Richland Municipal Airport (SDY) on schedule, select a flight that takes off from Daniel K. Inouye Intl. Airport (HNL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY) last-minute?
Last-minute bookings from HNL to SDY are typically more expensive. To secure the lowest prices, start searching for flights as soon as possible. That being said, if you can play around with your travel dates, it's possible to find a cheap ticket right before your journey.
Is it cheaper to book a HNL to SDY flight and hotel package?
Booking a HNL to SDY flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Pick from our impressive range of accommodations and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Daniel K. Inouye Intl. Airport (HNL) to Sidney-Richland Municipal Airport (SDY)?
If you reserved your HNL to SDY flight within the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more information.

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*Available to One Key members.