The Liberia Visa on Arrival (VoA) allows travelers to obtain a Visa upon arrival in Liberia by plane.
Quoted from the source.
Before you go
The conditions that come with this rule, from its official sources.
Conditions from official sources
Needs a Visa on Arrival approval applied for online at visaonarrival.lis.gov.lr before the flight.
Must arrive by air at Roberts International Airport (ROB) in Monrovia.
Must enter Liberia within 3 months of the approval.
Needs a valid Yellow Fever vaccination certificate.
Passport validity
Your passport must be valid for at least 6 months.
Hold a passport valid for at least six months from your entry date.
Tourist entry only
These rules cover tourist visits. Work, study and transit follow other rules.
The other way round
What Liberia passport holders need to visit Singapore.
Liberia passport Singapore
Visa-free
If you hold a travel document 1 issued by one of the countries or places listed below, you will require a valid Singapore entry visa to travel to, and seek entry, into Singapore.