Is it safe to visit Nepal now since the trip is non refundable?

I’ll offer a contrary opinion and say that you’re probably fine to go, although you may need to alter your itinerary. Contact your tour operator, they’ll be able to advise based on local knowledge, unlike us armchair speculators here on the Internets.

That said:

• Major intercity roads and city thoroughfares will almost certainly be cleared by May, this is a necessity just to get relief supplies flowing.
• Yes, local water supplies may be affected by the earthquake, but since sanitation in Nepal is woeful even at good times, they should be drinking bottled water only and choosing where to eat very carefully anyway. (Also, I infer your parents are Indians, in which case they’ll already be very used to this.)
• Since tourists are staying away in droves, the money you will spend as a tourist for hotels, restaurants, taxis, guides etc is more needed than ever.

Update: On June 15, 2015, Nepal reopened 6 of 7 closed World Heritage sites and urged more tourists to come visit.

I’ve been asking similar questions myself as I had a week booked from 16th May, plus a short trip next week. It is hard to see how the itinerary you describe could be feasible by the date your parents travel.

A magnitude 7.9 earthquake leaves widespread damage over a large area, and the areas your parents propose to visit are in the worst-hit area. Many roads are impassable, and in Chitwan in particular, there’s a good chance the hotel is not standing. Large areas are without running water and electricity, and sadly disease and increase crime tend to come in the wake of such disasters. You say it was booked through a tour operator. Contact them now, and ask about cancelling. If the operator is based in Nepal without a overseas agent, this may not be possible.

You don’t state your parents nationality, but many governments are advising against travel to Nepal and are evacuating their citizens. If that applies to your parents, most travel insurance policies will pay for cancellation. This is the case even if the flights and tour were non-refundable, as it’ll be the insurers rather than airlines and tour operators that pay your parents.

If this is part of a longer holiday, explore the possibility of booking something instead of the Nepal section of the trip. Most insurance policies will be happy to cover the cost of that, as it’s typically cheaper to pay for a replacement week in the middle of the holiday than covering the entire cancellation costs. But do speak to your insurers before doing that. I’ve been pleasantly surprised by how helpful mine were in discussing options over the phone.

If your parents are uninsured, they need to think very carefully about what to do. Cancelling and accepting the loss may well be best. However if they’re unwilling to do that, most airlines are still serving Kathmandu and most of the western-style hotels in Kathmandu are relatively undamaged. Probably the roads will be clear enough that it’s possible to get a taxi around Kathmandu, and if not, there are hotels along the ring road by the airport perimeter. But quite probably many of Kathmandu’s tourist attractions will be closed. They may be able to get an internal flight to a relatively unscathed part of the country such as the far east, and salvage something of a holiday there. But unless your parents are the sort of 60-year-olds who would be willing to risk sleeping on an airport floor, this is not a sensible option.

There are three ways your parents can end up not losing the money they spent:

• If they have trip insurance it may cover this sort of thing and enable them to claim a full refund and not go
• If the tour operator can’t provide what they paid for, the tour operator may give them a refund. Similarly if the airline can’t actually transport them they may provide a refund. This is a reasonable chance but I wouldn’t want to count on it. The chances will be increased if the tour agency is part of some sort of association or is licensed in some way.
• If the airline can transport them and the tour agency is willing to take them, then perhaps they can take the trip as planned, or modify it slightly to volunteer in some way and help the Nepalese people recover. I would guess that if the airline and tour people refuse to refund them, it’s because it’s safe to take them

May 18th is perhaps too far away to predict the state of food and water supplies. Nonetheless contacting the tour people immediately is the way to go. Also look for other sources of information – for example a number of Facebook groups after Cyclone Pam have been great for updates on which Vanuatu hotels and attractions are re-opening when. Doubtless similar groups are being created for Nepal already. Liking the hotels and attractions is great first step, as well as looking for relevant groups.