Kaitlyn Rosati has visited 90 countries and all seven continents, embodying a fast-growing cohort of solo travellers who choose to go it alone. But doing so has often cost more.

“That gondola ride in Venice costs 90 euros regardless of party size,” lamented Rosati, who runs the blog No Man Nomad.

Individual travellers also face single supplement markups — an extra fee to compensate for the cost at full occupancy — on many tours and cruises that typically serve couples and families. Even airfare can get strange: Algorithms sometimes return higher prices to a party of one than to a pair on the same flight, a quirk of opaque fare rules that has drawn scrutiny.

Still, travellers such as Rosati say there’s never been a better time to visit a destination solo: “The same way many people ha

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