As per the VivaAerobus Refund Policy, If travelers are able to confirm their flight cancellation with VivaAerobus online, travelers should be able to receive their refund from VivaAerobus in just a few days, less a cancellation fee charged. It may take up to 48 hours for VivaAerobus to refund, provided that travelers submit the cancellation request in time. To receive the full refund within 24 hours of booking, travelers simply need to verify there are at least seven days between their cancellation and the scheduled flight departure.

For more visit: https://airlinespolicy.com/cancellation-policy/vivaaerobus-cancellation-policy/