Best islands in Vietnam — Phú Quốc, Côn Đảo, Cát Bà and the rest

Vietnam's islands sit on a spectrum from "developed resort destination" to "remote and barely-connected". Each suits a different trip; trying to use Côn Đảo for a budget backpacker week or Phú Quốc for a remote-escape is a category error.

Methodology: ranked on accessibility, beach quality, infrastructure, distinctiveness, and price.

The 5 ranked

1. Phú Quốc (south, Gulf of Thailand)

The largest Vietnamese island; the standard "beach week" answer. Direct international flights from regional hubs (Bangkok, Singapore, Seoul); domestic flights from every major Vietnamese city. 30-day visa-free for direct arrivals from any nationality — a genuine differentiator.

• Best for: resort weeks, families, beginner-island travellers
• Cost: medium ($80–250/night accommodation)
• How to reach: fly direct PQC, or domestic from SGN / HAN / DAD
• When: November–April (dry season)

2. Côn Đảo (south, far offshore)

The Galápagos of Vietnam — pristine beaches, sea turtles, French colonial prison history, and the country's only Six Senses. Limited infrastructure (small airport, expensive flights) keeps it quiet. The premium island experience.

• Best for: luxury beach weeks, history-and-beach combos, divers
• Cost: high (Six Senses from $1,000+/night; budget options scarce)
• How to reach: fly Vietnam Airlines / Bamboo from SGN — limited daily flights
• When: March–September

3. Cát Bà (north, Hạ Long Bay)

The largest of the Hạ Long Bay islands. National park, kayaking, climbing, beaches on the southern coast. Cát Bà town is workmanlike (not pretty); the rewards are in the surrounding water. Hạ Long / Lan Hạ Bay cruises depart from here.

• Best for: adventure travellers, climbers, kayakers
• Cost: low–medium ($25–100/night)
• How to reach: ferry from Hải Phòng, or combined-ticket from Hanoi
• When: March–October

4. Lý Sơn (central, off Quảng Ngãi)

The "garlic island" — a working farming community on a volcanic outcrop. Black sand, basalt formations, no resorts, two small homestays. Best for travellers who want to walk an island in a day and eat at family homes.

• Best for: off-grid escape, photographers, slow-travel weekenders
• Cost: low ($20–50/night)
• How to reach: ferry from Sa Kỳ (Quảng Ngãi) — weather-dependent
• When: April–August (calm seas)

5. Cù Lao Chàm (central, off Hội An)

A protected marine reserve; 20-minute speedboat from Cửa Đại beach near Hội An. Best as a day-trip or single overnight. Diving, snorkelling, an empty beach by Vietnamese-tourism standards.

• Best for: Hội An visitors, day-trip snorkellers
• Cost: medium for tour, low for stay
• How to reach: speedboat from Cửa Đại / Cửa Đại beach
• When: March–September (closed off-season for safety)

Honourable mentions

• Phú Quý (Bình Thuận coast) — emerging escape, basic infrastructure
• Bình Hưng (Khánh Hòa) — small fishing-village island
• Nam Du archipelago (south) — backpacker-secret cluster of small islands
• Bái Tử Long islands (north) — the quieter neighbour of Hạ Long Bay

Which island for which trip?

What the rankings don't cover

• Diving certification: Phú Quốc is the best place to get certified (cheap, English-speaking instructors). Côn Đảo is best to dive after certification.
• Visa-day-trip strategy: Phú Quốc's 30-day visa-free is genuinely useful for travellers who don't qualify for the standard visa-free programme.
• Hidden costs: Côn Đảo's flight cost makes it premium-only; Phú Quốc's domestic flights are routinely under $50 one-way.

Related

• Best beaches in Vietnam
• Best places to visit in Vietnam
• Best quiet places in Vietnam
• Phú Quốc destination page
• Côn Đảo destination page