In fact, as HR should be booking the flights, but HR would not be conducting the interview, someone has gone out of their way to cancel that flight. It may even be that the "sponsor" has been fired and had their approval rights revoked.

After all if they could not screen you out, their own bona fides are then highly suspect.

This is actually quite hard to do and would have left a wide trail. That they used refundable tickets is significant.

You bombed at the interview, was the position misrepresented or in any way "Bait and Switch"? Sometimes the copy for the job is garbage.

Otherwise I would invoice for time and expense, and then sue for liquidated damages.

OP should a lawyer first, they are very good at this kind of billing.

In fact, as HR should be booking the flights, but HR would not be conducting the interview, someone has gone out of their way to cancel that flight. It may even be that the "sponsor" has been fired and had their approval rights revoked.

After all if they could not screen you out, their own bona fides are then highly suspect.

This is actually quite hard to do and would have left a wide trail. That they used refundable tickets is significant.

You bombed at the interview, was the position misrepresented or in any way "Bait and Switch"? Sometimes the copy for the job is garbage.

Otherwise I would invoice for time and expense, and then sue for liquidated damages.

OP should consult with a lawyer first, they are very good at this kind of billing.