A trip budget is useful only when it includes the costs that appear after you book the flight. Start with the money you can spend in total, then work backwards from the unavoidable items. This worksheet works for a weekend or a long journey.

1. Set a ceiling and a reserve

Write down your maximum total in your home currency. Keep a separate reserve for changes and unexpected transport. Do not treat that reserve as spending money. If the trip only works when every connection, meal and transfer goes perfectly, adjust the route before booking.

2. Price the whole route

• Transport to and from your departure airport.
• Flights, baggage, seats and any separate tickets.
• Transport from the arrival airport to the actual accommodation address, including a late-night alternative.
• Accommodation for every night, local taxes and any mandatory fees shown at checkout.
• Food, local transport, activities and connectivity.

Use the final checkout total rather than the headline fare. For each booking, record the currency, whether payment is due now or on arrival, and whether a deposit is refundable.

3. Compare options on one line each

A cheaper flight may arrive after public transport stops. A cheaper hotel may require a long daily commute. Compare each option as: booking price + required extras + transfer costs + time you are willing to spend. You do not need to assign a cash value to every hour; writing the time beside the total is enough to reveal a false bargain.

4. Keep one live record

Use a note or spreadsheet with columns for item, estimated cost, actual cost, payment date, cancellation deadline and confirmation number. Update it immediately after each purchase. If you are sharing costs, mark who paid rather than assuming you will remember later.

Before you pay

Check that the sum of confirmed bookings, remaining expected costs and reserve still fits your ceiling. If it does not, change an activity or accommodation choice before committing to another non-refundable purchase.