“at what time (or when) does your flight depart?” is correct. if you want to be technically correct, ask, “at what time (or when) is your flight scheduled to depart?”

Asking about a flight time in 2026 can be done formally or casually depending on your relationship with the traveler. A polite, direct approach is: "What time is your flight scheduled to depart?" or "When is your estimated time of arrival (ETA)?" If you are picking someone up, it is more practical to ask: "Could you share your flight number so I can track the status in real-time?" In a casual setting, you might say: "When do you head to the airport?" or "What time do you land?" Because 2026 travel often involves "dynamic scheduling," it is also common to ask: "Is your flight still on time, or has there been a pushback?" Using specific terms like "wheels up" or "gate arrival" can help clarify whether you are talking about the actual takeoff or the time they finish taxiing. If you are communicating via a messaging app, simply asking for a "Live Flight Link" is the most efficient way to stay updated on their progress without constant back-and-forth questioning.