When purchasing an airline ticket TO Venezuela (or OUT of Venezuela), you must purchase a round trip ticket. The cost of the ticket (unless you are going to Cuba) is approximately the cost you would pay to travel anywhere on any airline... "the going, market rate", this despite the fact that the Chavistas say that THEIR share of the ticket cost is a few dollars. (OF COURSE!)
What is occurring is that airlines sell their "Venezuelan share" of the ticket at the forced Chavismo cost, but make it up on the other end. You cannot purchase a one way "Venezuela" airline ticket, in Venezuela.
Secondly, the profits from flying in/out of Caracas (Maiquetía) are impossible to repatriate in currency that has value, so few airlines even bother to fly there any longer. The bolivar soberano is worthless. The only airlines that DO fly regularly are owned by the enchufados... persons "connected" with Chavismo that use this business monopoly to pad their fat bank accounts in Andorra. And of course, these businesses are paid in dollars or Euros. Not bolivars.
And now that PdVSA is nearly shut down, there is no way to get jet fuel. In a nation sitting atop 300 billion proven gallons of crude oil. With 3 of the largest refineries on the planet.