$948 Cheap Flights from Sidney (SDY) to Honolulu (HNL)

View $948 flight on Wed, Sep 10, 2025Opens in a new window

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

Cheap Flights from Sidney to Honolulu (SDY-HNL)

Prices were available within the past 7 days and start at $948 for one-way flights and $1,864 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Cape Air
Wed, Sep 10 - Wed, Sep 17
SDY
Sidney
HNL
Oahu
$1,864 Roundtrip, found 3 days ago
$1,864
Roundtrip
found 3 days ago
Select Cape Air flight, departing Wed, Sep 10 from Sidney to Oahu, returning Wed, Sep 17, priced at $1,864 found 3 days ago
Cape Air
Wed, Sep 10 - Wed, Sep 17
SDY
Sidney
HNL
Oahu
$1,890 Roundtrip, found 3 days ago
$1,890
Roundtrip
found 3 days ago
Select Cape Air flight, departing Wed, Sep 10 from Sidney to Oahu, returning Wed, Sep 17, priced at $1,890 found 3 days ago
Cape Air
Wed, Sep 10 - Wed, Sep 17
SDY
Sidney
HNL
Oahu
$2,191 Roundtrip, found 10 hours ago
$2,191
Roundtrip
found 10 hours ago
Select Cape Air flight, departing Wed, Sep 10 from Sidney to Oahu, returning Wed, Sep 17, priced at $2,191 found 10 hours ago
Cape Air
Wed, Sep 10 - Wed, Sep 17
SDY
Sidney
HNL
Oahu
$2,273 Roundtrip, found 10 hours ago
$2,273
Roundtrip
found 10 hours ago
Select Cape Air flight, departing Wed, Sep 10 from Sidney to Oahu, returning Wed, Sep 17, priced at $2,273 found 10 hours ago
Cape Air
Wed, Sep 10 - Wed, Sep 17
SDY
Sidney
HNL
Oahu
$2,299 Roundtrip, found 10 hours ago
$2,299
Roundtrip
found 10 hours ago
Select Cape Air flight, departing Wed, Sep 10 from Sidney to Oahu, returning Wed, Sep 17, priced at $2,299 found 10 hours ago
Flights from Sidney (SDY) to Honolulu (HNL)
Origin airport
Sidney-Richland Municipal
Destination airport
Daniel K. Inouye Intl.
Roundtrip price
$1,863
Distance
3469 mi

Sidney to Honolulu Flights

The cheapest times to fly from Sidney to Honolulu

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 Sidney to Honolulu are during the month of September. You can find some of the cheapest flights from Sidney to Honolulu with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Sidney to Honolulu

Sunday is one of the best days to book for cheap flights from Sidney to Honolulu: 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 Sidney to Honolulu

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 Sidney to Honolulu in 2025. You can also book with separate airlines for your outbound and return journeys, from $948 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 Sidney to Honolulu 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 Sidney to Honolulu 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 Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL) cost?
Grab a cheap one-way flight from $948 or cheap return flight from $1,864 from Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL) 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 Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL)?
September is the most affordable month to fly from SDY to HNL. Avoiding peak travel times is often the key to scoring lower fares.
What is the cheapest airline that flies from Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL)?
To find the cheapest airline flying from SDY to HNL, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL)?
There aren't any daily direct flights departing from Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL). But you can choose flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be on your way before you know it.
What day of the week has the most flights from SDY to HNL?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can vary based on various factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL)?
To reach Daniel K. Inouye Intl. Airport (HNL) on schedule, choose a flight that leaves Sidney-Richland Municipal Airport (SDY) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL) last-minute?
Waiting until just before your trip to book your flight from SDY to HNL often results in higher prices. While it's possible to find some last-minute offers, there's no guarantee. Be flexible with your itinerary to maximize your chances of landing a bargain.
Is it cheaper to book a SDY to HNL flight and hotel package?
Opting for a SDY to HNL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience 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 it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Sidney-Richland Municipal Airport (SDY) to Daniel K. Inouye Intl. Airport (HNL)?
In most cases, you're able to cancel or reschedule your SDY to HNL flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you'd like more details, go to our Customer Service portal.

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*Available to One Key members.