How to get a visa on arrival? A Vietnamese visa service is in charge of it, with the cooperation with the Vietnam Immigration Department. Your work is to fill in the provided application form, then send it to the company visa email. After 2 days (for normal service, 1 day for urgency), you will receive a visa approval letter issued from the Vietnam Immigration Department. Just print it out and bring it to your arrival airport to get it stamped. The fee (including service and stamping fee) depends on the type of visa you apply (it can fluctuate from 50USD for 1 month single to 150USD for 6 month multiple, more info ). In general, it is a bit cheaper than visa code.
It is easy to get Vietnam visa from Singapore. Have a nice trip!
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For those who would like to avoid the perhaps lengthening visa procedures with their local Vietnam's Embassies, the service of Vietnam Visa-On-Arrival is available for help. It is legitimated and supported by the Vietnamese Immigration Department. We recommend that you choose visa upon arrival, as picking up visa at the Vietnam int'l airport is quite simple, easy, no additional charges and no fail.