On board the world's longest low-cost flight – is 13 hours without frills really worth the savings?

With headline fares from just ￡150 each way, Norwegian’s new flights from Gatwick to Singapore promise to make south-east Asia more affordable than ever. But is travelling 6,764 miles, for 12 hours and 45 minutes, on what claims to be the world’s longest budget flight, with luxuries such as food and checked luggage costing extra, actually a pleasurable experience? Thanks largely to Norwegian’s new fleet of hi-tech 787-9 Dreamliners, yes it is.

I flew on the airline’s inaugural flight from London to the city state yesterday. The legroom in economy class (31 inches, with a precise 17.11 inches seat width) will leave taller travellers feeling a little cramped, and paying for snacks and drinks is always a drawback, but the service still offers very good value for money.

The Dreamliner’s ergonomic seats, bright and airy interiors, big windows and climate control buttons do much to add to the comfort levels already experienced on Norwegian’s long-haul flights, now including 11 destinations from Gatwick alone. Gatwick to Singapore will operate four times a week. The in-flight entertainment is also free of charge and hard to fault - expect new release films and popular TV boxsets.

At a glance | Norwegian's long-haul destinations from Gatwick

The big caveat, however, is that the lowest economy fares are only ever going to be snapped up by those who can be flexible about when to travel and who can plan and book their trips a long time in advance. On my flight, the excited couple sat beside me had booked their economy seats - “the cheapest option going” - around nine months beforehand.

Lorna Green had flown on one of Norwegian’s short-haul European flights before and had enjoyed the experience. “We weren’t worried about going in economy because we knew it was a new, nice plane and so the legroom would be good anyway,” she told me. It was this that saw the pair drinking prosecco at the departure gate during the airline’s pre-departure celebrations, while a lion danced at their feet.

For Lorna and her partner, and I suspect most Norwegian passengers, ￡150 was not the final cost of their flight. Checking in a bag will cost you an extra ￡25 each way, and two meals (which you'll probably need during almost 13 hours in the sky) costs another ￡25. Book both of these in advance and you also get to choose your seat. So that’s an extra ￡100 per person per return flight unless you want to travel to Asia with only hand luggage and a handsome supply of snacks to keep you going.

And those ￡150 fares really are elusive. Looking at departures in October, Norwegian’s lowest rates simply cannot be found. The cheapest available one-way ticket, departing on October 30, costs ￡279 (or ￡329 once you have paid for a checked bag and a couple of meals). Add a return flight a week later and you're looking at a minimum spend of around ￡470 (or ￡570 if you want checked luggage and food).

Which airlines offer the most legroom?

That figure of ￡570 certainly isn't a low-cost fare. Especially when you consider that British Airways has available seats on the same dates, which include a 23kg checked luggage allowance and free food and drink, for ￡498.  

We were able to find cheaper Norwegian fares further in advance: November 2-9 will cost you ￡350 for a return, or ￡450 including food and checked bags, for example, but unless you track down one of those headline ￡150 fares, you might be better off sticking with the premium carriers. Norwegian currently has ￡150 fares for departures on January 21, 24 and 29, and for plenty of dates in February in March. Fly out on January 29, and return on February 6, and you'll pay as little as ￡300 (or ￡400 with food and hold luggage). That's more like it. 

The cheapest direct flights from London to popular destinations

Once you've bagged that lead-in price and arrived in Singapore, there is a whole raft of regional budget airlines, from AirAsia and Scoot to Australian carrier JetStar, who can fly you on to other popular destinations in the region for very small sums of money. For those hoping to use Singapore as a starting point for a pan-Asian jaunt or, as Lorna and her partner were, the first stop on a round-the-world trip, book ahead and you could fly from London to Singapore for ￡150 with Norwegian, then on to Bangkok or Kuala Lumpur with AirAsia for around ￡30, or even Sydney from around ￡105 with Scoot.

And for those who need their legroom and cradle chairs, premium economy is available from ￡699 one way, or cheaper still, via an upgrade auction a few weeks before flying.

Around the world by budget airline