A Mekong cruise from Phnom Penh to Saigon is the slowest, prettiest, and least-stressful way to do the Cambodia-to-Vietnam crossing. Operators handle the paperwork onboard — but Australians still need to sort both visas before they board.

You arrange both visas yourself before you board, even though the cruise crew handles the actual border paperwork onboard. Apply for the Cambodia eVisa ($80 USD / ~$122 AUD all-in, approved in 3 business days, delivered as a printable PDF by email) at least two weeks before your flight to Phnom Penh. Apply for the Vietnam eVisa ($25 USD / ~$38 AUD single-entry) about three weeks before sailing. Both arrive as PDFs. The cruise purser collects every passport onboard the day before the Kaam Samnar–Vinh Xuong river crossing, processes Cambodian exit and Vietnamese entry while you sleep, and returns the lot at breakfast. You also still need the Cambodia e-Arrival Card for the flight into KTI Phnom Penh.
The appeal is partly the scenery — stilt-house villages, floating markets, brick-kiln islands, Khmer monasteries on red-dirt banks — and partly the logistics. The cruise handles every transfer, every meal, and crucially, every step of the river border crossing. You hand your passport to the purser the evening before, you sleep, and you wake up in Vietnam with a fresh entry stamp. Compared with the Bavet–Moc Bai bus crossing, where you handle paperwork yourself in a hot border yard, the river version is almost embarrassingly comfortable.

The Cambodia eVisa for Australians is $80 USD (~$122 AUD) all-in. Approved in 3 business days. Delivered as a printable PDF by email. No flight booking, no hotel reservation, no bank statement, no embassy interview. The Australian application walkthrough covers every field; the country pillar covers eligibility for Aussie passports.
The Vietnam eVisa is a separate application through the Vietnam e-Visa Portal. $25 USD (~$38 AUD) single-entry, three working days. Single-entry is fine for the cruise — you enter Vietnam once by river and exit once by air. If your wider trip plan includes a Vietnam-to-Cambodia loop later, look at the multi-entry version at $50 USD (~$76 AUD). The Vietnam–Cambodia visa combo guide covers the dual-visa sequencing in more detail.

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首次赴柬埔寨旅行?以下是面向美国人的诚实首次旅客清单——签证、美元货币特点、安全现状、疫苗接种、寺庙着装规范,以及2026年新机场的实际抵达体验。
自2025年6月以来,泰国与柬埔寨之间的全部七个陆地边境已关闭,因此在2026年,美国人从泰国进入柬埔寨的唯一方式是乘坐飞机。以下是曼谷至暹粒和曼谷至金边航线的工作方式、登机前所需的柬埔寨电子签证,以及为何旧的波贝陆路计划已不再可行。
三种方式跨越柬埔寨首都与吴哥窟之间的195英里:15美元的特快巴士、45分钟的航班或缓慢的河流渡轮。以下是每种方式对美国旅行者的实际费用、所需时间以及哪种适合您的行程。

The Cambodia e-Arrival Card is mandatory for every air arrival into Cambodia, regardless of whether you are continuing by cruise. Your incoming flight from Bangkok, Singapore, or Kuala Lumpur to Phnom Penh's KTI airport triggers the requirement. The card has 14 fields, must be submitted in the 7-day window before your flight, and is checked at the Phnom Penh e-gates alongside your eVisa. The e-Arrival 14-field walkthrough covers every field. KTI replaced the old Phnom Penh airport on 9 September 2025 — the KTI airport guide covers the layout if you have not flown in since the switch.

Book the cruise 9 to 12 months ahead for high season, especially if you want a specific cabin tier or a particular departure date. Apply for your Cambodia eVisa and Vietnam eVisa 3 to 6 weeks before sailing — early enough to have the PDFs in hand well before you fly out of Australia, late enough to keep both validity windows comfortably overlapping the cruise dates. The visa cost guide breaks the full Aussie-dollar conversion picture down for 2026.
The cruise drops you in Saigon — fly home from SGN.
See the combo guide →Bangkok flight stopover only; no overland to Cambodia.
Read the closure update →Upriver Mekong, Luang Prabang to Cambodia overland.
Plan the Laos route →Easiest long-haul stopover into Phnom Penh.
Sort the stopover →Pair Bali with the Mekong on your next two-leg trip.
Compare the two →One last point on the Thailand alternative: some Aussie cruise itineraries used to combine a Bangkok or Chiang Mai overland leg with the Phnom Penh embarkation. That overland leg has been off the table since June 2025 — all seven Thailand–Cambodia land borders remain closed. Bangkok is still a useful flight stopover en route to KTI, but you cannot continue overland. The Thailand–Cambodia border closure update has the broader context.
Next steps and related reading for Australians: apply for your Cambodia eVisa when you are ready to lodge, bookmark our Cambodia visa hub for Australian citizens as the single canonical reference, skim the FAQ on Cambodia visa eligibility for quick answers, and use our glossary of Cambodia visa terms to decode any acronym in this guide.