Barry Gill was due to fly out on Wednesday to give away his daughter Gemma Brown at her wedding in Cyprus.
But the cancellation of all Monarch flights from the UK has left him and his wife Deborah wondering whether they will even be able to make it to Friday's ceremony at all.
Barry is from Hartlepool but now lives in Houghton.
Mr Gill's stepdaughter, Joanne Richardson, 24, said her parents could be forced to shell out as much as £800 for new flights, but they were unsure if they could afford it.
She said: "We found out early this morning that Monarch had gone bust and we've spent all the time since then trying to sort out new flights.
"We (she and her stepsister) are already out in Cyprus but Mum and Dad, with working during the week, had been planning to come Wednesday through to Saturday.
"We checked the website in the morning and it said all the flights were cancelled. It's left people in the lurch.
"I'm not sure whether they're going to be able to get out as it's a lot of money to find in the space of a day."
Mr and Mrs Gill, aged 54 and 49, had been due to fly from Leeds Bradford Airport for the wedding in Larnaka.
Ms Richardson added: "It was the news nobody wanted.
"My stepsister has got all the wedding preparations to deal with, so we're trying to get it sorted.
"We just don't know whether he's going to be there to give her away."
But after hours of turmoil she later told how Hays Travel had "sorted everything out" and her parents did not need to buy flights.
Jane Schumm, Hays Travel retail and training director, said: “Our customers are our top priority and we’re working methodically to secure new flights for all affected, as well as ensuring that all of our customers overseas are looked after.”
About 300,000 future bookings were cancelled when Monarch was placed into administration on Monday morning.
Customers have been told to keep away from airports as there will be no more flights.
They have been advised to check a dedicated website, monarch.caa.co.uk, for advice.