Cathay Pacific Flight 139 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Cathay Pacific Flight 139 Route Deals From $597

The cheapest prices found with in the last 7 days for return flights were $685 and $597 for one-way flights to Kingsford Smith Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Aug 11 - Thu, Aug 21
HKG
Hong Kong Intl.
SYD
Kingsford Smith Intl.
$685 Roundtrip, found 4 hours ago
$685
Roundtrip
found 4 hours ago
Select Cathay Pacific flight, departing Mon, Aug 11 from Hong Kong Intl. to Kingsford Smith Intl., returning Thu, Aug 21, priced at $685 found 4 hours ago

Frequently asked questions

What route does flight number CX139 take?
Flight number CX139 operates direct from Chek Lap Kok Intl. Airport to Sydney, NSW Airport (SYD-Kingsford Smith Intl.). During this trip, you can expect to be in the air for about 9 hours and 5 minutes. Consider booking ahead to secure your favorite seat.
What terminal does CX139 fly out of?
Flight number CX139 runs between HKG and Kingsford Smith Intl. Airport (SYD), and passengers traveling on this flight usually take off from Terminal 1.
What kind of plane is on flight number CX139?
There's every chance you'll find yourself traveling aboard a Boeing 777-300ER if you have a seat on flight CX139. This flight almost always takes off from Hong Kong Intl. Airport (HKG) and arrives at SYD.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your CX139 flight with Travelocity, please visit our Customer Service Portal.