SriLankan Airlines Flight 503 Deals & Information (2025/2026)

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SriLankan Airlines Flight 503 Route Deals From $506

The cheapest prices found with in the last 7 days for return flights were $920 and $506 for one-way flights to Heathrow for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Dec 25 - Sat, Jan 10
CMB
Bandaranaike Intl.
LHR
Heathrow
$920 Roundtrip, found 1 day ago
$920
Roundtrip
found 1 day ago
Select SriLankan Airlines flight, departing Thu, Dec 25 from Bandaranaike Intl. to Heathrow, returning Sat, Jan 10, priced at $920 found 1 day ago

Frequently asked questions

What route does flight number UL503 take?
UL503 operates from Colombo Airport (CMB-Bandaranaike Intl.) to LHR and flies direct. This trip usually takes 11 hours and 25 minutes.
How often is UL503 on time?
SriLankan Airlines flight number UL503 departs according to schedule on 72% of its journeys. You may want to leave a little space in your itinerary if you are taking this flight. If there is a set back, the average wait time is about 16 minutes. This route has a 2.15-star rating.
What kind of plane is on flight number UL503?
You'll most likely find yourself traveling aboard the Airbus A330-300 if you're on flight UL503. This flight almost always jets off from CMB and comes in to land at Heathrow Airport.
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 UL503 flight with Travelocity, please visit our Customer Service Portal.