Passengers who cancel their reservation after 24 hours are subject to cancellation costs from Allegiant Airlines. The cost per passenger is about $75, though it can change depending on the kind of reservation you make. Allegiant Airlines, on the other hand, is charging up to USD 25 each person during COVID-19.
https://flightcancellation...

If you need to cancel your Virgin Atlantic flight, it all depends on what type of ticket you purchased. If you have received a refundable ticket, you can cancel it as per the rules that came with your ticket. But if you have got a non-refundable ticket like Economy Lite, unfortunately, you can not cancel it. You have a few options for canceling: you can do it online, call them, or ask your travel agent to help you.