How much do Virgin charge for a flight change

[JudyC]

Our original trip should been April 20 and we kept our VA ticket open. Now looking to book again for Oct 21, but our eldest son may want to tag on an extra week in California staying with my brother. He did plan a California trip in 21 but still wants to do Florida in 21 as well. He isn't decided whether to make 21 Florida and defer Cali until 22 , or to combine the two.
If we book return flights from MCO now as they are a good price and then he wants to return from LAX after an extra week how much would VA normally charge. I know he would pay the flight difference if it was more expensive but what about an admin fee?

[Seaworldfan]

We've just moved our November 21 Flights to October 22 with Virgin, cost £50 per person. Probably paid 3 or £400 more than id like to for PE and the Car but im happy we have flights secured and can start planning again.

[macadoo]

We rebooked our open ticket recently and we get 2 more flight changes foc. I’m not sure if this would include just changing 1 ticket and changing the return airport though.