Walk-in prices at the airport are usually higher because demand is immediate and limited. Online booking platforms allow you to compare multiple providers, which helps you find better deals.
Other cost-saving tips:
Choose economy/manual cars instead of automatic
Avoid unnecessary add-ons like premium insurance if not needed
Book early (2–3 weeks before travel)
Avoid the peak summer season if possible
Most travelers who book early save 20–40% compared to last-minute rentals.