What aircraft does UL503 use?

SriLankan Airlines flight UL503 operates on a Airbus A330-300 from CMB to LHR.

How long is the UL503 flight?

The estimated flight time for UL503 from CMB to LHR is approximately 11h 24m covering 8,715 km (5,415 miles).

How many seats does this Airbus A330-300 have?

This SriLankan Airlines Airbus A330-300 has 297 total seats across 2 cabin classes: Business, Economy.

What cabin classes are available on this aircraft?

This Airbus A330-300 offers 2 cabin classes: Business, Economy. Seat distribution: 28 Business seats, 269 Economy seats.

What route does UL503 fly?

SriLankan Airlines flight UL503 operates from CMB (Bandaranaike International Colombo Airport) to LHR (London Heathrow Airport), connecting Colombo 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.

UL503 Seat Map

● On time

SriLankan Airlines · Airbus A330-300 · Tue, 09 Dec 2025

Depart

CMB · Colombo

11h 24m

5,415 mi

Arrive

LHR · London

+ Seat alert

J · Business

0/28

Y · Economy

173/269

Filter:

First Business Premium Economy Economy Extra legroom / exit Occupied Blocked

View:

Business · Economy · Rows 1–67

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

50C

Score 80 #1

Extra legroom · Quick exit access

Extra legroom

30C

Score 68 #2

Easy aisle access · Near wings (smoother ride)

Aisle

30D

Score 68 #3

Easy aisle access · Near wings (smoother ride)

Aisle

35A

Score 68 #4

Window view · Near wings (smoother ride)

Window

Get Seat Alerts

UL503 Flight Details

Flight Number: UL503

Origin:

(Bandaranaike International Colombo Airport, Colombo)

Destination:

(London Heathrow Airport, London)

Distance: 8,715 km (5,415 mi)

Est. Duration: 11h 24m

Flight Date: December 09, 2025

Aircraft: Airbus A330-300

Airline Routes: View SriLankan Airlines route map

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Flight Route Map

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Aircraft Configuration

Aircraft Details

Seating info & configuration

Airline: SriLankan Airlines (UL)
Aircraft: Airbus A330-300
Seating: Main Deck: 297 seats

Economy: 269

173 66 30

64% Available

Business: 28

0 0 28

0% 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

SriLankan Airlines Airbus A330-300 seat map layout for flight UL503 from CMB to LHR — Reference layout

This Airbus A330-300 operates SriLankan Airlines flight UL503 from Colombo (CMB) 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 UL503

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 35A Economy
Seat 34K Economy
Seat 34A Economy

Best Aisle Seats

Seat 50C Economy
Seat 30C Economy
Seat 30D Economy

Best for Legroom

Seat 50C Economy

Exit Row Seats

Seat 50C Economy

Quietest Seats

Seat 35G Economy
Seat 32A Economy
Seat 31K 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.

Reviews

Passenger Reviews for UL503

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Airbus A330-300 Seat Map

Full SriLankan Airlines Airbus A330-300 seating chart, cabin layout, and seat reviews.

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