Below the surface
Diving the outer Great Barrier Reef from Cairns is an add-on to a day cruise, not a separate trip. Boats start at $186 and dives are booked on top, either as an introductory dive with a guide and no certificate, or as certified dives if you bring your card and log book.
Introductory or certified
The dive is an add-on. The boat ticket comes first.
An introductory dive needs no qualification. You get a briefing on the boat, a guide who stays with you throughout, and a shallow dive of twenty or thirty minutes at around six to eight metres. Most people manage it. Some do not get past the first few metres and that is fine too.
Certified diving means bringing your card and a log book. Boats typically run two dives across the day at different sites, with a guide available and buddy pairs organised on board. Gear is hired; some people bring their own mask and computer.
Both are booked in addition to the boat ticket, either at the time or on the morning. On the busiest days the introductory slots fill, so booking ahead is sensible.
The flying rule
Diving puts nitrogen into your tissues and ascending to altitude too soon after a dive risks decompression sickness. The standard guidance is to wait eighteen hours after a single dive and twenty-four after repetitive diving before flying.
That has a direct consequence in Cairns: if you are combining a dive day with a scenic flight, do the flight on a different day, or on the same day before you dive. The combination trips that include a helicopter are not dive trips for this reason.
It also applies to your flight home. Do not book a dive for the morning of your departure.
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Before you book
Green Island and Fitzroy are inshore, closer and cheaper. They are a different day.
An environmental management charge per person per day, often not in the headline price.
Ninety minutes each way in open water. Take it before you board.
You float face-down for hours and your back takes the full sun.
Big pontoons take hundreds. Smaller vessels visit two quieter sites.
The wind builds through the day and so does the swell.
Every trip, current fare
For comparison: everything that leaves Cairns and Port Douglas.
| Trip | Time out | Price | In the water | Cost per hour | Rating |
|---|---|---|---|---|---|
| Premium Catamaran Reef CruiseA full day on the outer reef, best value | 9 h | $186 | Yes, most of the day | $20.67 | 4.8 · 3,821 |
| Reef Cruise + Scenic HeliThe reef from the water and from the air | 8.5 h | $297 | Yes, most of the day | $34.94 | 4.6 · 1,140 |
| Reef Pontoon by HelicopterHelicopter out, a day on the pontoon | 6–7 h | $456 | Yes, on the pontoon | $70.15 | 5.0 · 6 |
| Outer Reef & Coral Cay CruiseTwo reef sites, dives available | 8.5 h | $195 | Yes, two sites | $22.94 | 4.8 · 1,611 |
| Reef Cruise + 10-Min HeliPontoon day with a ten-minute flight | 7 h | $317 | Yes, on the pontoon | $45.29 | 4.6 · 32 |
| Rainforest & Barron Falls FlightTwenty minutes over gorge, falls and rainforest | 20 min | $233 | No | $699.00 | 4.4 · 2 |
| 30-Minute Reef FlightHalf an hour over the ribbon reefs | 30 min | $329 | No | $658.00 | 4.6 · 37 |
| Port Douglas Reef FlightHalf an hour over the reef, from Port Douglas | 30 min | $329 | No | $658.00 | 4.7 · 10 |
| 40-Minute Reef FlightA wider loop over the outer reef | 40 min | $395 | No | $592.50 | 4.7 · 7 |
| 45-Min Reef & RainforestReef and rainforest in one flight | 45 min | $457 | No | $609.33 | 4.8 · 24 |
| 60-Minute Reef & RainforestThe longest scenic flight from Cairns | 1 h | $652 | No | $652.00 | 5.0 · 2 |
| Port Douglas Outer ReefFrom Port Douglas to the Agincourt reefs | 7.5 h | $216 | Yes, most of the day | $28.80 | 4.8 · 506 |
Whatever you book, take a morning departure.
When to come→Common questions
Yes. An introductory dive includes a briefing and a guide who stays with you, at around six to eight metres. No qualification is needed.
The boat is from $186 and the dive is an add-on on top, booked at the time or on the morning.
The outer reef and coral cay cruise at $195. It visits two sites on a smaller vessel and runs a proper dive operation.
Not immediately. Wait eighteen hours after a single dive and twenty-four after several. Do the scenic flight before you dive, or on another day.
Certification card and log book. Gear is hired on board; many people bring their own mask and dive computer.
Yes. Operators ask a medical questionnaire before booking and some conditions require a doctor’s clearance.
Go deeper
Every scenic flight from Cairns, by duration and by what you actually see.
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