インドシナ一周ビザ：アメリカ人向け、カンボジア・ベトナム・ラオス1周旅行

What the loop costs and what you upload

For a standard one-direction loop, the combined visa cost for an American adds up cleanly. A single-entry Vietnam e-visa at $25, a Cambodia Tourist eVisa at $80, and a Laos eVisa at $50 comes to $155 in visa fees for all three countries. Add the $20 verified Cambodia e-Arrival Card and the total reaches $175 for the full circuit, fully covered. If your route re-enters Vietnam at any point — common when you fly home from a Vietnam hub — swap the $25 single-entry Vietnam e-visa for the $50 multiple-entry version, which lifts the visa total to $180 plus the e-Arrival.

These are line items, not deal-breakers. The Cambodia figure is fixed and all-in: it includes the approval delivered as a printable PDF, free resubmission if Immigration flags a correction, and US-timezone support, so there is no second invoice if your photo bounces. Budget all three visas at the start of your planning and the paperwork barely registers against flights and accommodation for a multi-week trip.

The documents all three countries want

ループ旅行者の朗報として、3カ国すべてでアップロード書類はほぼ同一です。1セットを準備して再利用しましょう：機械読み取り可能なテキストがすべて明確に判読できる米国パスポートの生物情報ページの鮮明なスキャンまたは写真、無眼鏡、白背景で自然な表情の最近のパスポートスタイルデジタル写真、PDF添付を受け取れる有効なメールアドレス、そして支払い用のカード。カンボジアはVisa、Mastercard、AmEx、PayPal、Apple Pay、Google Payを受け入れています。

3カ国すべてでアメリカ人が見落とす一つの细节：米国パスポートは入国の日から最低6ヶ月の有効期間が必要です。そして各出入境管理システムはパスポートの機械読み取りゾーンから情報を読み取るため、各申請書の名前はパスポートと完全に一致する必要があります—一文字一文字同一で。如果您持有第二国籍，请在提交这三个签证中的任何一个之前，决定您将使用哪本护照旅行，并始终使用同一本护照申请所有签证。我们的柬埔寨电子签证文件指南为美国人详细说明了导致大多数可避免拒签的照片和扫描规格。

いつ何を申請するか

最初の国際線フライトの10〜14日前に、3つのビザをすべて同じ日に申請してください。ずらして申請する運用上の理由はありません—3つのポータルは独立して並行処理され、それぞれ約3〜5日で完了します。一緒に申請することで、出発前に3つの承認をすべて手にに入れることができ、どの国で写真の再提出を求められても、旅行日程を変更せずに済むバッファがあります。

小さな優先順位を設定したい場合は最初に入国する国の申請を優先し、各フォームの入国日を実際の旅程に合わせておいてください。ベトナムとラオスの電子ビザは入国口岸と出国口岸を指定するよう求められます поэтому在各表格上保持一致的出行日期非常重要。柬埔寨电子签证要求提供预期抵达日期，但不会锁定该日期——签证自签发之日起3个月内有效，因此在此窗口内几天内调整日期没有问题。

余裕を持たせ、焦らないで

各ビザの標準承認期間は3〜5日ですが、「営業日」が重要です。美国的周末或柬埔寨、越南、老挝的公共假期会增加日历等待时间，因此周五晚上提交的申请要到下周才会开始处理。提前10-14天提交可以吸收任何此类延迟。在最后72小时才处理三个签证是循环旅行者将常规申请变成紧张经历的最常见方式。

如果您正在规划实际行程，我们关于将30天分配到柬埔寨、越南和老挝的指南会提供真实的三国路线，标注签证检查站并计算停留限制，以帮助您避免任何单一行程的超期停留。

3国間の移動：機能する陸路国境

两個陆地边境承担了柬埔寨与其邻国之间的大部分环线交通。越南一侧是从胡志明市到金边的路线上的莫拜（越南）到巴维（柬埔寨）——旅游巴士每天运行，整个行程（包括边境处理）大约需要6至7小时，拥有双方签证的美国人在获得批准后可以顺利通过。老挝一侧是从老挝南部的DOM KLAROR到老挝的TRAPEANG KREAL再到柬埔寨的路线，连接老挝南部和Stung Treng，有小巴和直通巴士服务。2026年，这两个口岸均正常开放运营。

整个环线的不可协商规则：每个签证必须在您到达相关边境之前就已到手。柬埔寨及其邻国都不会在这些陆路口岸可靠或有计划地发放临时旅游签证，因此缺少批准意味着您无法通关。这就是为什么提前10至14天在线提交所有三个签证申请如此重要——陆路口岸并不是您忘记申请签证的后备方案。

One regional note that reshapes any overland plan involving Thailand: every Thailand–Cambodia land border has been closed since June 2025, with no scheduled reopening confirmed as of April 2026. The old Bangkok-to-Siem Reap overland hop no longer works. If Thailand is on your wider itinerary, you fly between Thailand and Cambodia rather than driving. The Vietnam–Cambodia and Laos–Cambodia land borders are unaffected by that closure — they remain the reliable overland links for the loop.

If the Laos crossing is your plan, our guide to the Laos-to-Cambodia border at Dom Kralor for US citizens covers the bus routes, what the officers check, and how long each side actually takes. Flying between the loop cities is also straightforward — Saigon to Phnom Penh, Hanoi to Siem Reap, and Vientiane to Phnom Penh are all short, well-served hops.

周回旅行における一回入国トラップ

This is the part that catches more loop travelers than any document mistake. All three visas default to single entry, and single entry means exactly that — one crossing in, and the visa is spent. The moment you leave the country, that visa is finished, even if you intended to come back the next day.

Picture a common loop: fly into Saigon, bus to Phnom Penh, see Angkor Wat, head up to Laos, then return to Vietnam to fly home from Hanoi. That route enters Vietnam twice — once at the start, once on the return — so a single-entry Vietnam e-visa will not work. You need the $50 multiple-entry Vietnam e-visa for that itinerary. The Cambodia and Laos eVisas are both single-entry by design, so each handles its one leg of the loop perfectly — but if your route re-enters Cambodia or re-enters Laos at any point, that second entry requires a second application for that country.

The rule of thumb: count the number of times you cross into each country, and buy an entry for each. One entry into a country, single-entry visa. Two or more entries, multiple-entry where the country offers it (Vietnam), or a fresh application each time where it does not (Cambodia and Laos). Map your border crossings before you file, not after you have already paid for the wrong entry type.

Re-entering Cambodia after a side trip into Vietnam or Laos is common enough that we wrote it up in full: our guide on re-entering Cambodia after Vietnam or Laos for Americans walks through exactly when you need a second eVisa and how to time the fresh application so it does not stall your loop.

カンボジアe-Arrivalの手順と全体のまとめ

One last piece that neither Vietnam nor Laos has an equivalent for: the Cambodia e-Arrival Card. Every air arrival into Cambodia must file it — 14 fields covering your passport, flight number, arrival date, accommodation, and a short customs declaration. It is separate from the eVisa, mandatory, and submitted within 7 days before your flight into Cambodia. Our verified e-Arrival is $20 USD, checked end-to-end before it reaches Cambodian Immigration. A single date-format slip on the Card is one of the most common reasons travelers get bounced back at the kiosk, so it is worth getting right.

If you fly into Cambodia, you file the e-Arrival Card. If you cross into Cambodia by land at Bavet from Vietnam or at Trapeang Kreal from Laos, the e-Arrival requirement does not apply the same way — it is the air-arrival step — but your eVisa still has to be approved and in hand. Vietnam and Laos ask for nothing equivalent on either side; each e-visa PDF is the whole document set at its own immigration desk.

So the full loop, start to finish: three separate visas, filed online on the same day 10 to 14 days out; one Vietnam e-visa (single or multiple entry depending on your route), one Cambodia eVisa, and one Laos eVisa; the Cambodia e-Arrival Card if you fly into Cambodia; and every approval in hand before you reach any border. When you are ready, you can apply for your Cambodia eVisa now, and keep our Cambodia visa for US citizens hub bookmarked as the single reference for every Cambodia rule, fee, and document.