Choosing the right shuttle timing depends on your flight type, terminal layout, and any extra time needed for holidays or early‑morning banks. Use the airline’s check‑in cutoff as your base and work backward to set your pickup. Adjust for passport control at IAH, the single‑terminal simplicity at Hobby, and any added queues during peak periods.
The short answer (answer-first)
For domestic flights, plan to be at the curb two hours before the airline’s check‑in closes; for international flights, plan three hours before the cutoff. Add fifteen minutes for passport and customs if you arrive at IAH Terminal D, and add a full thirty minutes during holiday weeks or Monday‑morning banks. Set your pickup by working backward from those totals, remembering that drivers aim to arrive five to ten minutes early.
IAH and Hobby in one line each
IAH is the larger international hub north of downtown, serving most international carriers and travelers from the north side or The Woodlands, while Hobby is the compact Southwest hub southeast of downtown, favored by Southwest passengers and those with south‑side addresses.
The two-hour and three-hour rules explained
The standard rule at Houston’s airports is two hours before a domestic departure and three hours before an international departure. United Airlines’ published guidance matches this, noting that check‑in closes at least forty‑five minutes before domestic flights and sixty minutes before international flights. Your shuttle pickup should be set so you arrive at the curb in time to meet those check‑in deadlines.
Terminal layout: why it changes your timing
At IAH, arrivals are on the lower level of each terminal (A through E) and Terminal D handles all international arrivals, requiring an extra fifteen minutes for passport and customs clearance when you book. At Hobby, arrivals, baggage claim, and group meeting points share one terminal complex, making navigation straightforward and eliminating the need for extra transfer time between buildings.
Working backwards from check-in cutoffs
To determine your shuttle pickup, start with the airline’s check‑in cutoff: two hours before domestic departures and three hours before international departures. Subtract your desired curb‑side arrival time from that cutoff to get the pickup time. For example, if a domestic flight checks in mid-morning, aim to be at the curb two hours ahead; if an international flight checks in early afternoon, aim for late morning at the curb. Remember to add any terminal‑specific extras, such as the fifteen‑minute customs buffer at IAH Terminal D.
Holiday weeks and the early-morning banks
Holiday weeks and Monday‑morning departure banks add queue time at both airports, so build in a full extra thirty minutes when traveling during those windows. For early‑morning flights between 5 and 7 a.m., reserve your shuttle the night before to lock in the pickup time, and book at least twelve hours ahead whenever possible to ensure availability.
Which Houston airport you are leaving from changes the drive, not the rule. Hobby's single terminal complex means one curb for everything - departures, arrivals and group meeting points share the same building - so the two-hour domestic window covers the terminal comfortably. At Bush Intercontinental, departures and arrivals spread across terminals A through E, and an international itinerary out of Terminal D adds passport and customs time on top of the three-hour window. Either way, the pickup time is staged backwards from the airline's check-in cutoff: two hours for domestic, three for international, with a full extra 30 minutes during holiday weeks and Monday-morning peaks.
One more habit that pays off: book with your flight number. On the arrival side the pickup clock runs off the actual landing - 30 minutes after a domestic touchdown, 45 after an international one, and 15 minutes for domestic carry-on-only travelers - so an early or late arrival adjusts the pickup automatically. Reservations are accepted 24/7 when drivers are available, and a reservation made the night before an early-morning departure removes the last variable from the timing math. Drivers help load and unload bags at the curb on every ride as standard, which shaves minutes off the terminal rush you just budgeted for.
For route details, see our Hobby airport guide.
For route details, see our Houston airport shuttle.
For route details, see our airport shuttle booking page.