In 2026, you can use the Uber app to request a ride 24/7 in most major global cities, but "whenever you want" is subject to driver availability and local regulations. In high-demand areas like New York, London, or Mumbai, you will almost always find a ride within minutes. However, in smaller towns or during late-night hours in suburban areas, wait times can increase significantly, or the service may be unavailable. To counter this, Uber’s "Reserve" feature allows you to book rides up to 90 days in advance, providing more certainty for airport runs or early morning appointments. It is also important to note that "whenever you want" doesn't mean "at any price"; during peak times, Surge Pricing can double or triple the fare. Always check the app for a "real-time" estimate before assuming a ride is instantly available, especially during major events or extreme weather.