What aircraft does CX251 use?

Cathay Pacific flight CX251 operates on a Boeing 777-300ER from HKG to LHR.

How long is the CX251 flight?

The estimated flight time for CX251 from HKG to LHR is approximately 12h 32m covering 9,631 km (5,984 miles).

How many seats does this Boeing 777-300ER have?

This Cathay Pacific Boeing 777-300ER has 294 total seats across 4 cabin classes: First, Business, Premium Economy, Economy.

What cabin classes are available on this aircraft?

This Boeing 777-300ER offers 4 cabin classes: First, Business, Premium Economy, Economy. Seat distribution: 6 First seats, 53 Business seats, 34 Premium Economy seats, 201 Economy seats.

What route does CX251 fly?

Cathay Pacific flight CX251 operates from HKG (Hong Kong International Airport) to LHR (London Heathrow Airport), connecting Hong Kong and London.

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.

CX251 Seat Map

● On time

Cathay Pacific · Boeing 777-300ER · Fri, 14 Nov 2025

Depart

HKG · Hong Kong

12h 32m

5,984 mi

Arrive

LHR · London

+ Seat alert

F · First

4/6

J · Business

42/53

W · Premium Economy

29/34

Y · Economy

192/201

Filter:

First Business Premium Economy Economy Extra legroom / exit Occupied Blocked

View:

First · Business · Premium · Economy · Rows 1–72

100%

Pinch to zoom • Double-tap to zoom in

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Get seat alerts

Top picks · Economy

Highest-scoring available seats on this aircraft

59C

Score 93 #1

Extra legroom · Quick exit access

Extra legroom

59H

Score 93 #2

Extra legroom · Quick exit access

Extra legroom

59B

Score 70 #3

Extra legroom · Quick exit access

Extra legroom

40G

Score 68 #4

Easy aisle access · Near wings (smoother ride)

Aisle

Get Seat Alerts

CX251 Flight Details

Flight Number: CX251

Origin:

(Hong Kong International Airport, Hong Kong)

Destination:

(London Heathrow Airport, London)

Distance: 9,631 km (5,984 mi)

Est. Duration: 12h 32m

Flight Date: November 14, 2025

Aircraft: Boeing 777-300ER

Airline Routes: View Cathay Pacific route map

Award Availability: Check award seats on AwardTravelFinder

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Flight Route Map

Explore More Routes:

View flights from HKG View flights to LHR View Cathay Pacific route map

Aircraft Configuration

Aircraft Details

Seating info & configuration

Airline: Cathay Pacific (CX)
Aircraft: Boeing 777-300ER
Seating: Main Deck: 294 seats

Economy: 201

192 9 0

96% Available

Premium Economy: 34

29 5 0

85% Available

Business: 53

42 11 0

79% Available

First: 6

4 2 0

67% 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 Boeing 777-300ER operates Cathay Pacific flight CX251 from Hong Kong (HKG) to London (LHR). 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 CX251

Based on legroom, location, and passenger preferences

Members only

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Create a free account to see which seats have the best legroom, views, and quietest locations.

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Best Window Seats

Seat 32A Premium Economy
Seat 32K Premium Economy
Seat 33A Premium Economy

Best Aisle Seats

Seat 59C Economy
Seat 59H Economy
Seat 40G Economy

Best for Legroom

Seat 59C Economy
Seat 59H Economy
Seat 59B Economy

Exit Row Seats

Seat 59C Economy
Seat 59H Economy
Seat 59B Economy

Quietest Seats

Seat 59C Economy
Seat 59H Economy
Seat 59J 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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