Most round-the-world plans fail in the same way: too many countries, in the wrong order, in the wrong months, booked as a rigid chain that cannot absorb a single change. The fix is not more research. It is making four decisions properly and leaving everything else open.
1. Direction, which is decided by the seasons
You go west to east or east to west, and almost every round-the-world air ticket requires you to keep going one way without backtracking.
The real determinant is not jet lag, it is climate. A trip is a sequence of seasons, and the whole shape of it comes from deciding which months you want to be in which hemisphere.
Two workable skeletons:
Leaving Europe in September, go east: Southeast Asia in the northern winter dry season, Australia and New Zealand for the southern summer around December to February, South America from March, arriving in the Andes for the start of their dry season in May.
Leaving in April, go west: North America in early summer, the Pacific, then Southeast Asia arriving in the November dry season, then India from December.
What you are avoiding: Southeast Asia’s monsoon, Patagonia’s winter when everything closes, India’s May at 45°C, and the Caribbean and Pacific hurricane seasons.
You cannot avoid all of them. The skill is choosing which compromise you accept.
2. Fewer countries than you think
The single most common mistake. A year is not long, and travel days are dead days.
A useful rule: one country per month for a first long trip, and consider a fortnight the minimum in anywhere you actually want to see. That produces twelve countries in a year, which sounds thin on paper and is a full, unhurried trip in practice.
The alternative — thirty countries in twelve months — produces a year of airports, and people who have done it consistently say the same thing about it.
Group geographically. A month in Southeast Asia’s mainland crossing overland is one region, not four countries.
3. How to buy the flights
Three approaches, and the right one depends on how fixed your plan is.
A round-the-world ticket from an airline alliance — Star Alliance, oneworld — is one fare covering a set number of segments or miles, with dates changeable free or cheaply and routing changes charged. It is good value if you are covering long distances, and it forces a continuous direction. It is worst for people who want to improvise, because the route is fixed at purchase even if the dates are not.
Individual one-way tickets, bought as you go, is what most long-term travellers actually do now. Low-cost carriers, which are not in the alliances, cover most short and medium-haul routes for very little, and one-ways are no longer heavily penalised on many routes. It is more flexible and usually cheaper, and it means you never know what the next leg costs.
A hybrid — book the three or four expensive intercontinental legs in advance and improvise everything within a region — is the approach that works for most people.
Onward ticket requirements catch people out. Many countries require proof of onward travel at check-in, and airlines enforce it even where the country does not. Options: buy a cheap refundable regional flight, or use one of the services that rent a real ticket for 48 hours.
4. Visas, in advance, in a spreadsheet
The thing to build before you book anything: a list of every country, what visa your passport needs, whether it can be obtained on arrival or must be applied for in advance, how long it lasts, and whether it needs a physical embassy visit.
The ones that reliably cause problems: countries requiring application from your country of residence, which you cannot do mid-trip; countries requiring blank passport pages, of which you need more than you think; and the Schengen 90-in-180 rule, which is a rolling window across the whole area and is now automatically enforced.
Check passport validity too. Six months beyond your date of entry is the standard requirement and a passport expiring mid-trip is a serious problem.
Budget
Costs vary by a factor of five between regions, so an average daily figure is close to useless. Budget by region instead: Southeast Asia, South Asia, Central America and the Balkans at one level; Western Europe, Japan, Australia and Patagonia at three or four times it.
The big fixed costs that people forget: flights between regions, travel insurance for the full duration, vaccinations, visas, and the one or two set-piece experiences — Antarctica, a gorilla permit, the Inca Trail — that cost more than a month of ordinary travel.
Add a contingency of at least 15 per cent. Something will go wrong, and the alternative to a contingency is coming home early.
What to book before you leave
Very little. The first three nights’ accommodation, the first flight, insurance, and anything genuinely capped: Inca Trail permits, Torres del Paine beds, gorilla permits, Galápagos cruises, and Japanese accommodation in cherry blossom season.
Everything else gets cheaper and easier to arrange from close range, and booking it early buys a schedule you will resent by week six.