Find Cathay Pacific(CX) flights from Hong Kong to Koh Samui

At the moment, you can catch a nonstop flight from Hong Kong to Koh Samui with the following airlines, including: Bangkok Airways HK Express Hong Kong Airlines Emirates Cathay Pacific Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

It takes about 3 hours 20 minutes to fly from Hong Kong to Koh Samui.

By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Hong Kong to Koh Samui is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

Based on Trip.com data in the past 4 weeks, there is 6 flight per week flying from Hong Kong to Koh Samui. You can check the weekly schedule for popular airlines on this route below: Cathay Pacific: S/M/T/W/T/F/S -- CX6503 (17:29)

The cheapest months to fly from Hong Kong to Koh Samui is October, when demand for travel is lower.

After crunching the numbers on our May flight calendar, it's currently cheapest to fly from Hong Kong to Koh Samui on May 16, 2026 with HK Express, with prices starting at US$322.

You can land at any one of the following hubs in Koh Samui, with Hong Kong International Airport to Samui Airport (HKG-USM) is by far the most common option on this route: Samui Airport (USM).

The time difference between Koh Samui and Hong Kong is 1h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.