Once you notice that $90 repeats across three centres, the price stops being the question and the group size takes over.
How big is the group?#
OnBird goes one way and builds a ten-guest beginner trip that runs from 8:00 to 16:30 for 2,150,000 VND (about $83). The rest go the other way:
- Vietnam Active: a maximum of four guests on the fun diving day, and no more than two per instructor on the beginner day.
- Phu Quoc Diving Club: one instructor with one or two beginners, but fun divers go out on a big shared boat.
- Kimie's south: a one-to-one try dive.
- Ecodive: a Discover Scuba described as one-on-one.
North or south — what changes?#
North and south are two different seasons, not two directions. Northern dives only run in the dry season, November to April, from Dương Đông harbour, about an hour and a half out to a site it usually names as Turtle Island, at around nine metres. Flipper prices the north below the south, from 1,400,000 VND (about $54) against 1,800,000.
The south is the deeper, year-round option: Ecodive dives around 18 metres, with up to 30 for advanced divers, multi-level and drift dives, and there is a trade-off: diving is accessible all year, but because the island sits close to the Mekong delta, peak-season visibility is rarely what you would find on Vietnam's eastern seaboard.
What should you settle before you pay?#
Poseidon quotes 'Only $80' for the dive-plus-snorkelling programme and 'Only $90' for fun dives without saying whether that is per person, so ask the school for the unit before you pay.
Is there anything besides the standard boat day?#
If you want to dive without getting on a boat schedule, Red River's Seawalker at the Ocean World coral park is the outlier of the section: a four-hour trip with 15 to 20 minutes on the sea floor in a helmet, or scuba instead, one instructor per guest, 1,350,000 VND (about $52) for the adult ticket — ask for the child rate when you book.
Night diving is a single option with a single rule. Kimie's takes certificate holders only, 17:00 to 21:00, two dives, $150 per person, and states the price is identical on the north and the south side of the island — so the choice of harbour, Dương Đông or An Thới, is yours and costs nothing either way.
Important
There is no diving in the north from 10 May to 20 October.