The cheapest times to fly from ISN to SYD are

  • January 29th to May 6th (except the weeks of February 12th, March 19th, and March 26th)
  • August 6th to September 30th (except the week of August 20th)
  • October 22nd to December 9th (except the week of November 19th)

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 ISN to SYD is early May. Prices can be as high as $3294 for Friday flights during late December, or as low as $1325 for Tuesday flights around early May.


When to Fly to Sydney

Flying from Williston, ND (ISN) to Sydney (SYD) will usually cost between $1325 to $2334 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early May with an average ticket price of $1363. Due to high demand the most expensive time to fly is late December, with an average price of $2842. Planning your trip to low-cost times can easily save you $1479 on economy flights and even more on first-class flights. Generally, any price below $1459 can be considered a good price for a round-trip ISN to SYD flight.

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

ISN to SYD Flight Prices

Compared to other flights, the ISN to SYD flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Williston. The average price per mile (for a direct flight) is $0.11, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to SYD. Fridays are the most expensive days to fly to Sydney. Selecting flights on the least expensive days could save you up to $148 (8%) 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 $1472. Return trip prices are from the SYD to ISN flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from ISN to SYD can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 16 hour 25 minutes may not be realistic.


Flight Hacking ISN to SYD

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 ISN to SYD — but Champion Traveler does!

Hack #1: Los Angeles, CA (ISN > LAX > SYD)

  • Price for both tickets: $1445
  • Average savings: $15 (0.99%)

See ISN to LAX flights


Flight Questions Answered

Still have questions about flying from ISN to SYD? We’ve got answers.

Which airlines fly this route?

You can find 7 major airlines flying this route most often: Air Canada, Air New Zealand, American, Delta, Qantas, United, Virgin Australia, and potentially more during busy seasons.

How far away is it from Sydney International Airport to Sloulin Field International Airport?

The distance between the two airports is roughly 8574 miles or 13798 kilometers.

How long does it take to fly from ISN to SYD?

The real-world flight time for a nonstop ISN to SYD flight is about 16 hour 25 minutes.

How many flights go between Williston, ND and Sydney?

It depends on the day of the week and the date, but a typical day might have around 8 available flights from ISN to SYD.


Airport Location Info


Departing Airport

Origination code ISN
Origination airport name Sloulin Field International Airport
City Williston, ND
Country the United States
Latitude 48.2
Longitude -103.6

Return Airport

Destination code SYD
Destination airport name Sydney International Airport
City Sydney
Country Australia
Latitude -33.9
Longitude 151.2


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.