Entering Thailand from Laos — Border Crossings Guide
The Mekong River forms most of Thailand's border with Laos, and four Friendship Bridges provide the main crossings. This guide covers each one in practical detail.
Quick Answer
Which is the busiest Thailand–Laos crossing?
The First Thai–Lao Friendship Bridge at Nong Khai is the most heavily used crossing, connecting to Vientiane (the Lao capital). It handles the most tourist traffic and has the best onward transport connections into Thailand, including a train link to Bangkok.
The Four Main Crossings
Nong Khai / Vientiane (First Friendship Bridge) is the premier crossing. A shuttle bus runs across the bridge from Nong Khai station into Laos. On the Thai side, Nong Khai has direct overnight trains to Bangkok Hua Lamphong and Krung Thep Aphiwat (Bang Sue). The crossing is open daily 6am–10pm. This is the go-to crossing for travellers doing a Vientiane visa run from Northeast Thailand.
Chiang Khong / Huay Xai (Fourth Friendship Bridge) connects northern Thailand to Laos, and is the end point of the famous Mekong slow boat journey from Luang Prabang. From Chiang Khong, songthaews and buses run to Chiang Rai (1.5 hours) and Chiang Mai (around 4–5 hours). Open 6am–10pm.
Mukdahan / Savannakhet (Second Friendship Bridge) is the main crossing in the central northeast. Mukdahan is a pleasant river town with connections to Udon Thani, Khon Kaen, and Bangkok by bus or train. Used primarily by travellers exploring central Laos.
Nakhon Phanom / Tha Khaek (Third Friendship Bridge) is quieter and suits those exploring the Tha Khaek loop (a motorbike circuit through central Lao caves and karst). Good connections to Nakhon Phanom airport for domestic Thai flights.
Visas and Visa Runs
Most Western nationals receive a 60-day visa exemption on entry to Thailand from Laos. The Laos–Thailand crossing has historically been popular for "visa runs" — crossing out of Thailand briefly to reset the entry stamp. Thai immigration now limits land border visa exemptions to two per calendar year and may question travellers who cross repeatedly. If you need ongoing stay, apply for a proper Non-Immigrant Visa.
To enter Laos, most nationalities can obtain a visa on arrival at the Friendship Bridges (cost around USD 30–50 depending on nationality). Laos e-visas can be arranged online in advance at evisa.gov.la.
Visa Disclaimer
Practical Tips
Overstay fees on the Lao side are charged per day — keep track of your Lao visa validity. Thai baht is widely accepted in border towns on the Lao side, but the exchange rate will be poor. Change currency after crossing into Thailand.
Bus services from Vientiane to Nong Khai and onward to Udon Thani airport (the nearest international airport to the crossing) are plentiful. Udon Thani has budget flights to Bangkok with AirAsia and Thai Lion Air, making the Nong Khai crossing convenient for heading south without the long train journey.