Start planning as soon as the idea is real. Start booking on a schedule: roughly two to eight months ahead for international flights, longer for peak dates, and one to three months for short-haul. The two are different jobs. Planning early costs you nothing and removes the friction that makes trips fall apart. Booking early is about price and availability, and there's a right window for it.
Here's how the timing works in 2026, and one new rule for Europe you'll want on your radar.
When to book: the numbers
For international flights, the useful window is broad. Data from flight specialists Going suggests the best fares tend to appear around two to eight months out, with roughly eight months a sweet spot for long-haul, stretching to ten months for peak seasons like summer and Christmas (Going). Short-haul and domestic fares behave differently: one to three months ahead is usually enough, and booking eleven months out (the moment airlines open their schedules) tends to cost more, not less.
For accommodation, the rule of thumb inverts by demand. Sought-after places in high season, a boutique hotel in Amalfi in July, a ski chalet at New Year, go early or go without. Cities with deep supply can wait.
The season matters right now. It's September. If you're eyeing Christmas markets in Vienna or winter sun in the Canaries, you're already inside the sensible booking window. Spring 2027 trips are the thing to plan now and book over the coming weeks.
When to plan: as early as you like
Booking has a right time. Planning doesn't. The single biggest reason trips never happen isn't cost, it's uncertainty, the vague sense that it'll be a hassle to sort out. Every week you leave the idea as a mental note is a week it can talk itself out of existence.
The trick is to start the plan early and let it grow as details firm up, rather than trying to assemble it all in one anxious weekend. A shell of an itinerary in September becomes a real one by the time you book, instead of ten browser tabs you open in a panic the night before.
The new Europe timing you should plan around
If you're travelling to Europe from outside the Schengen area, there are two new border systems to factor in. The EU's biometric Entry/Exit System (EES) reached full operation across Schengen borders on 10 April 2026 (official EU guidance). And ETIAS, the travel authorisation UK, US and other visa-exempt visitors will need, is not yet in operation. The fee is set at €20, and the EU will announce the start date several months before launch (official ETIAS guidance).
Neither is a visa, and neither should derail a trip. But they're one more reason to have your plan settled early rather than scrambling at the gate. Check the official sites for the confirmed go-live date before you travel.
Keep the plan somewhere it can grow
This is why Tralendr works the way it does. You start a trip the moment it's real, add pieces as they firm up, and it all stays in one visual, day-by-day itinerary on a map, editable and shareable with a link. The plan grows with you instead of being rebuilt from scratch. Which means you start early, and actually go.