We pay for travel as we book the arrangements. It usually fits into our monthly budget and we will adjust our other spending for the month if necessary. I book the different parts as I do the planning and pay as I book. I'll take some cash out before the trip specifically for tipping. During the trip, meals, shopping, uber, anything not pre paid, goes on a credit card. We have a few thousand dollars of discretionary spending in our monthly budget and several credit cards. We can pay the balances off before they accrue interest. We never pay interest on anything!