Got 18 hours and 45 minutes?

That’s the length of a new flight between Singapore and Liberty International Airport in Newark. Service on what Singapore Airlines says will be the longest commercial flight in the world begins on Oct. 11. The flights will become daily beginning on Oct. 18.

Contrast that to the shortest regularly scheduled commercial flight, a one-and-a-half-minute hop between Westray and Papa Westray, two islands north of the Scottish mainland, by Loganair.

Singapore Airlines will be the first airline to use Airbus’s A350-900 U.L.R. (for ultra long range) planes, which have extra fuel capacity, are made of a carbon fiber that is lighter than the aluminum of traditional jets and burn less fuel because they have only two engines, compared with the four on many other long-haul jets.

The flights will have 161 seats — 67 in lie-flat business class and 94 in premium economy, which uses bigger seats that have more legroom than traditional coach seats but do not have the ability to become a bed.