Planning is the difference between a good trip and the kind you need another vacation to recover from.
It depends how complex it is, but for international trips with flights, visas, and limited vacation days, starting 2–4 months out gives you decent fares, time to fix passport or visa issues, and enough choice in stays without over-researching things to death. Big once-in-a-lifetime stuff (like long-haul hikes, major festivals, or peak-season Europe/USA/Japan) can benefit from 6–9 months’ notice for award flights and popular stays, while simple weekend trips or domestic breaks can honestly be pulled together in 1–3 weeks if your documents and basics are already sorted.
Overplanning only really ruins a trip when every hour is locked in and you feel guilty for drifting from the script. Good planning just removes nasty surprises: closed sights, missed last trains, sold-out must-dos, or wasted money. Aim to book the skeleton—transport, stays, and 1–2 key things you’d be gutted to miss—then leave gaps each day for wandering, naps, or random invitations. If your written plan feels like a work calendar, you’ve gone too far; if it fits on one page with plenty of blank space, you’re probably fine.
Start by being brutally honest about your total number—then shape the trip to that, not the other way round. Pick fewer places and move less, travel in shoulder or off-season, base yourself where stays and food are cheaper, and spend most of your time doing low-cost or free things like walking, markets, and public parks. Reserve a little money for one or two ‘wow’ experiences you’ll remember, and cut back on forgettable stuff like taxis, random shopping, and overpriced views you can get for free elsewhere. Planning here is about trade-offs: if you know what you’re choosing to skip and why, the trip feels intentional, not like constant penny-pinching.