# Boarding time vs departure time

> Departure time is when the plane leaves the gate. Boarding starts 30 to 40 minutes before that, and each airline's gate cutoff is listed here.

By Derek Johnson. Updated Nov 7, 2026. Source: https://skycapapp.com/articles/leaving/boarding-time-vs-departure-time/

Departure time is when the plane is due to leave the gate. Boarding usually starts 30 to 40 minutes before that, and the door closes about 15 minutes before it. So the number that governs your day sits about 15 minutes ahead of the one printed largest on your ticket.

Takeoff is later again. Over the 12 months to August 2026, the median taxi out at US airports was 16 minutes, and the 90th percentile was 30.

## The gate cutoff by airline

Boarding start times are mostly unpublished and vary by aircraft. Gate cutoffs are published, in contracts and on airline sites, and they're the ones with consequences. All of these are for domestic flights, as read on November 7, 2026.

| Airline | The rule | What it says happens |
|---|---|---|
| Delta | At the gate, ready to board, 15 min before departure | Reservation may be cancelled; Delta won't hold the flight |
| American | At the gate 30 min before; boarding ends at 15 | Seat may go to someone else |
| United | At the gate 15 min before | Reservation may be cancelled, boarding denied |
| Southwest | In the gate area 10 min before | Reservation may be cancelled |
| JetBlue | On board 15 min before | May be refused, even with a boarding pass |

International flights run earlier. American wants you at the gate 45 minutes before, Delta suggests the same, and JetBlue wants you on board at 20. United's contract says 30 at some international airports. Your own boarding pass overrides this table.

I couldn't read a current gate rule on Alaska's site when I checked. Its 2015 post on boarding is still online and lays out a sequence from 40 minutes down to 20, and I'd treat that as a guide to the shape of things.

Southwest is the one that says when boarding can start: as early as 30 minutes before departure. The time printed on your pass is the one to trust.

## The time on your ticket can run early

Plenty of people treat departure time as a promise that the plane will be there until then. It's closer to an estimate. In the records for about 7 million US domestic flights over the year to August 2026:

| Left the gate | Share of flights |
|---|---|
| Before scheduled time | 57% |
| 5+ min early | 36% |
| 10+ min early | 9% |
| 15+ min early | 1% |

That's why the cutoff matters. An airline that has everyone on board has every reason to shut the door. Southwest's contract says outright that it may depart early once everyone who met the check-in rules is on board. If you walk up to the gate 12 minutes before the printed time, the plane may already have gone.

The reverse is true when a flight is delayed: boarding can begin later than printed. A posted delay doesn't move the cutoff until the airline moves it. [Late aircraft](/articles/late/late-aircraft) explains how to tell when a delay is real.

## Why trackers show several times

An arrival or departure in airline reports means the gate, which is defined that way in [14 CFR 234.4](https://www.law.cornell.edu/cfr/text/14/234.4). "Wheels up" and "wheels down" are the runway. A tracker that shows "departed" while you're sitting at the end of a taxiway isn't wrong, and neither is your airline's app showing a different time: [why they disagree](/articles/overhead/why-tracker-and-airline-disagree) goes through it.

The times also move in a connection. If your second flight is 45 minutes after the first lands, you really have about 30: [how long a 45-minute connection really is](/articles/leaving/45-minute-connection) has the numbers. For the hours before all that, see [when to leave for the airport](/articles/leaving/when-to-leave-for-the-airport).

## These rules move

Airlines change these rules, and they vary by airport and aircraft. The table is a dated reading of each airline's public page. The early-departure figures cover US airlines' domestic flights, and exclude cancelled and diverted ones.

> Skycap counts down to boarding on your flight, not to departure. If your plane is arriving late, the boarding time moves with it and the page says why. [How it works at the airport](/app/features#before)

## Questions people ask

**What's the difference between boarding time and departure time?** Boarding time is when the airline starts letting people on. Departure time is when the plane is due to leave the gate, usually 30 to 40 minutes later.

**Is departure time when the plane takes off?** No. US airlines report departure as leaving the gate. Takeoff comes after the taxi out, a median of 16 minutes later over the year to August 2026.

**Can a plane leave before its departure time?** Yes, and it happens often. About 36% of US domestic flights left the gate 5 or more minutes early in that year. If you met the cutoff, you should already be on board.

**How late can I get to the gate?** It depends on the airline: 10 minutes before departure at Southwest, 15 at Delta and United, and 30 at American, whose boarding ends at 15.


## Sources

- [14 CFR 234.4, gate departure and arrival times](https://www.law.cornell.edu/cfr/text/14/234.4)
- [Delta, US domestic check-in requirements, read Nov 7 2026](https://www.delta.com/us/en/check-in-security/check-in-time-requirements/domestic-check-in)
- [Delta, international check-in requirements, read Nov 7 2026](https://www.delta.com/us/en/check-in-security/check-in-time-requirements/international-check-in)
- [Delta, Contract of Carriage, revised Aug 18 2026](https://www.delta.com/us/en/legal/contract-of-carriage-dgr)
- [American Airlines, Conditions of Carriage, updated Aug 13 2026](https://www.aa.com/web/i18n/customer-service/support/conditions-of-carriage.html)
- [United Airlines, Contract of Carriage, read Nov 7 2026](https://www.united.com/en/us/fly/contract-of-carriage.html)
- [Southwest Airlines, Contract of Carriage, effective Nov 6 2026](https://www.southwest.com/swa-resources/pdfs/corporate-commitments/contract-of-carriage.pdf)
- [Southwest, boarding process, read Nov 7 2026](https://support.southwest.com/helpcenter/article/boarding-process)
- [JetBlue, boarding procedures, read Nov 7 2026](https://www.jetblue.com/help/boarding-procedures)
- [Alaska Airlines, how boarding works, Aug 13 2015](https://news.alaskaair.com/alaska-airlines/how-boarding-works/)