What aircraft does CX139 use?

Cathay Pacific flight CX139 operates on a Airbus A350-1000 from HKG to SYD.

How long is the CX139 flight?

The estimated flight time for CX139 from HKG to SYD is approximately 9h 45m covering 7,394 km (4,594 miles).

How many seats does this Airbus A350-1000 have?

This Cathay Pacific Airbus A350-1000 has 334 total seats across 3 cabin classes: Business, Premium Economy, Economy.

What cabin classes are available on this aircraft?

This Airbus A350-1000 offers 3 cabin classes: Business, Premium Economy, Economy. Seat distribution: 46 Business seats, 32 Premium Economy seats, 256 Economy seats.

What route does CX139 fly?

Cathay Pacific flight CX139 operates from HKG (Hong Kong International Airport) to SYD (Sydney Kingsford Smith International Airport), connecting Hong Kong and Sydney (Mascot).

How do I choose the best seat?

The best seat depends on your priorities. For extra legroom, choose seats near emergency exits or bulkhead rows. For quick boarding/deplaning, select seats near the front. Avoid seats near lavatories or galleys if you prefer a quieter flight. Window seats offer views and a wall to lean against, while aisle seats provide easier access to move around.

What do the different seat colors mean?

Green seats are typically available for selection, red seats are occupied or blocked, yellow/orange seats may have restrictions or extra fees, and blue seats often indicate premium or preferred seating with additional charges. Hover over any seat to see specific details and pricing.

Can I change my seat after booking?

Yes, most airlines allow seat changes after booking, though fees may apply depending on your fare type and desired seat. You can typically change seats through the airline's website, mobile app, or by calling customer service. Some seats become available closer to departure as the airline releases blocked inventory.

When is the best time to select seats?

The best time varies by strategy. Book immediately after purchasing your ticket for the widest selection, or wait until 24 hours before departure when airlines often release blocked premium seats. For popular routes, early selection is recommended. Our seat alerts can notify you when preferred seats become available.

Are the seat maps updated in real-time?

Our flight seat maps are updated regularly throughout the day to reflect current availability. However, seat availability can change rapidly, especially close to departure. We recommend checking the airline's official website for the most up-to-date information when making your final selection.

What if my preferred seat isn't available?

You can also check back periodically as seats often open up closer to departure when other passengers make changes or when the airline releases additional inventory.

CX139 Seat Map

● On time

Cathay Pacific · Airbus A350-1000 · Tue, 30 Dec 2025

Depart

HKG · Hong Kong

9h 45m

4,594 mi

Arrive

SYD · Sydney (Mascot)

+ Seat alert

J · Business

18/46

W · Premium Economy

3/32

Y · Economy

116/256

Filter:

First Business Premium Economy Economy Extra legroom / exit Occupied Blocked

View:

Business · Premium · Economy · Rows 11–77

100%

Pinch to zoom • Double-tap to zoom in

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Economy

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Get seat alerts

Top picks · Economy

Highest-scoring available seats on this aircraft

59H

Score 85 #1

Extra legroom · Quick exit access

Extra legroom

60K

Score 85 #2

Extra legroom · Quick exit access

Extra legroom

59K

Score 77 #3

Extra legroom · Quick exit access

Extra legroom

46G

Score 68 #4

Easy aisle access · Near wings (smoother ride)

Aisle

Get Seat Alerts

CX139 Flight Details

Flight Number: CX139

Origin:

(Hong Kong International Airport, Hong Kong)

Destination:

(Sydney Kingsford Smith International Airport, Sydney (Mascot))

Distance: 7,394 km (4,594 mi)

Est. Duration: 9h 45m

Flight Date: December 30, 2025

Aircraft: Airbus A350-1000

Airline Routes: View Cathay Pacific route map

Award Availability: Check award seats on AwardTravelFinder

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Flight Route Map

Explore More Routes:

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Aircraft Configuration

Aircraft Details

Seating info & configuration

Airline: Cathay Pacific (CX)
Aircraft: Airbus A350-1000
Seating: Main Deck: 334 seats

Economy: 256

116 60 80

45% Available

Premium Economy: 32

3 23 6

9% Available

Business: 46

18 25 3

39% Available
Legend: Seat Status

Blocked

Occupied

Standard

Cabin Classes

First

Business

Premium Economy

Economy

Extra legroom / exit

Features

Exit door

WC Lavatory

GALLEY Galley

CREW Crew area

This Airbus A350-1000 operates Cathay Pacific flight CX139 from Hong Kong (HKG) to Sydney (Mascot) (SYD). Browse the interactive seat map above to find the best seats for your journey, view real passenger reviews, and explore detailed cabin configurations to make an informed decision for your flight.

Best Seats on CX139

Based on legroom, location, and passenger preferences

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Best Window Seats

Seat 60K Economy
Seat 43A Economy
Seat 43K Economy

Best Aisle Seats

Seat 59H Economy
Seat 46G Economy
Seat 45G Economy

Best for Legroom

Seat 59H Economy
Seat 60K Economy
Seat 59K Economy

Exit Row Seats

Seat 59H Economy
Seat 60K Economy
Seat 59K Economy

Quietest Seats

Seat 44H Economy
Seat 44G Economy
Seat 44D Economy

Recommendations based on seat characteristics, cabin position, and proximity to facilities. Availability may vary by date.

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Seat Selection Assistance

Seat Alerts Require Payment

Seat alerts are available to users with a paid plan or credits. This feature monitors seat availability and notifies you when your preferred seats become available.

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