Travelling alone in St Petersburg is easy in the places you would expect to be awkward, and expensive in the places that look cheap. Most solo visitors get this backwards and quietly delete half the city from their plans.
What costs more when you are one person
Hotels sell rooms, not beds. A double room costs roughly the same whether one person or two sleeps in it, and "single occupancy" almost never means half price. A couple splits that bill; you do not. Short-term apartments work the same way.
Then come the activities priced per party rather than per head. Escape rooms are the clearest case: the Kub quest on Novocherkassky Prospekt 16/12 states that its game is built for teams of 2 to 10 players, so a single traveller cannot book it at all. Private boat hire on the canals is charged by the hour for the whole boat. Tastings and cooking classes are usually calculated from two guests up, because that is how the kitchen buys ingredients.
Guided tours split into two very different products. Some are open groups where you buy one ticket, and the Peterhof estate lets you book park tours online in advance. Others are sold as "excursion service for a group of up to N people" at a fixed price for the group. Book that one alone and you pay for the whole group.
What is easier alone
Museums are better solo. You can stand in front of one painting for forty minutes without anyone sighing behind you. The Hermitage in particular is far more bearable without a companion checking the time.
Theatres favour single travellers, because single seats are exactly what stays on sale after the pairs are gone. The Mariinsky alone has three venues in the city, including the Concert Hall on Pisareva Street 20.
Long walks are the one format a group actively ruins. So are public bathhouses: the shared hall is priced per person, while a private room is rented for two or three hours as a whole unit.
How to avoid the awkward parts
Discomfort usually comes from furniture, not from prices. A table for four with a candle, occupied by one person, is a test of character. Panoramic restaurants built around couples are worse. The fix is always the same: look for a bar counter or a high table by the window, where eating alone is normal. Food halls and market halls with long shared tables work just as well.
If three days of silence start to wear on you, St Petersburg runs dinners with strangers, where you sit at one table with people you have never met and the evening ends when the dinner does. Free walking tours have a similar effect.
One practical habit: nobody will watch your bag. Keep a small shoulder bag, keep everything in it, and never leave it on a chair, not even for a minute. And rather than asking passers-by for portraits, photograph the city and yourself in shop windows and canal reflections. This town reflects everything.
