How much time to allow for a transfer at Manila Airport from a domestic to an international flight?

There is no definite answer to this question, as it all depends on the terminals of arrival and departure. Manila Airport has 4 terminals, all located at a distance from each other, and if you have a change, you will have to travel between them, and accordingly need more time. In addition, you need to consider the possibility of delays and cancellations, the need to collect baggage, and pass through security.

If you assume ideal conditions without delays and queues, then for a transfer without changing terminals you can allow 2 hours, and with a terminal change 3 hours. But in reality, we recommend allowing at least 5 hours for any transfer to have a time buffer for unforeseen delays.

Also keep in mind that domestic flights in the Philippines are sometimes canceled or rescheduled, which can result in you simply missing your next flight and not flying; your tickets will just be forfeited and no one will be responsible in such a case. You need to consider that the weather in the Philippines can be quite unpredictable and extreme, and at any moment, even in the height of the "dry" season, a typhoon may come. Then flights may be canceled or rescheduled, and ferry services may be interrupted. In such cases, you can find yourself trapped on an island without the ability to get to Manila or another island. Such cases happen, and we have had this experience. Therefore, we recommend that when planning your trip, you still arrive on the departure island at least one day before your flight, and preferably two days.

We also advise reading information for travelers about the weather and seasons in the Philippines here - https://nashaplaneta.net/asia/philippines/art-sezony-na-philippinah

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