As the U.S. and Israel’s war with Iran squeezes global oil supplies, travelers have valid reasons to worry about the cost and availability of flights as they plan their late spring and summer trips. Experts say booking earlier, and staying flexible on dates, destinations and departure airports can help reduce costs. Packing light means avoiding rising baggage fees. Using airline points or signing up for a travel credit card are other ways to make flights more affordable. Travel experts caution consumers against purchasing Basic Economy tickets, though. Even though they are the cheapest, they may rule out refunds or credits if passengers need to cancel.

A looming jet fuel shortage in Europe and Asia sparked by the Iran war and the effective closure of the Strait of Hormuz could further upend world travel within weeks if oil doesn’t start flowing soon. That means higher airfares and flight cancellations. International Energy Agency Director Fatih Birol says Europe has maybe six weeks of remaining jet fuel supplies. In general, some European countries hold several months’ worth of jet fuel inventory at a time. That's according to a report this week from the IEA. Airlines have reacted with caution, acknowledging fuel issues but working to reassure customers. Still, some carriers have already passed costs on to consumers by increasing fees for baggage and add-ons, embedding costs into ticket prices, or raising fuel surcharges.

Travel, especially during the holiday season, can be stressful. But following some tips from the pros as you prepare for a trip can make for a smoother, less anxious experience.