Check your airline's website or app first

The fastest way to know if your flight is on time is to go directly to your airline's website or mobile app and search for your flight number. You will need your confirmation number (the six-character code from your booking email) or your last name and booking reference. Most airlines show real-time status updates including departure time, gate number, and any delays.

If you booked through a third-party site like Kayak, Expedia, or Google Flights, those sites also pull live data from airlines. However, the airline's own system is usually fastest because it updates first. Open the app on your phone rather than the website if you are at the airport — apps refresh more frequently and work better on slower airport WiFi.

Key Takeaways

  • Your airline's website or app shows the most current flight status and is faster than third-party booking sites.
  • You need your confirmation number or last name and booking reference to look up your flight.
  • Airport departure boards and airline customer service lines confirm status when the website shows conflicting information.
  • A delay shown online may change within minutes, so check again 30 minutes before your scheduled departure time.
  • Text or email alerts from your airline notify you automatically if your flight is delayed, so enable them during booking.

Use the airport departure board when you arrive

Once you are at the airport, the departure board is the official source of truth. It shows your flight number, scheduled departure time, actual departure time (if different), and gate assignment. The board updates every few minutes as conditions change. If the board shows a different time than your airline's app, the board is correct — it reflects what the airport and airline are coordinating in real time.

Departure boards are usually located in the main terminal near check-in and again near the security checkpoint. If you cannot find one, ask any airport staff member. They can also tell you whether a delay is weather-related, mechanical, or due to crew scheduling — information that helps you decide whether to wait or rebook.

Call your airline's customer service line

If the website is down, the app is not loading, or you see conflicting information, call your airline's customer service number. This number is on your booking confirmation email and on the airline's website. Have your confirmation number ready. A representative can tell you the current status, whether the delay is expected to change, and what your options are if the flight is significantly delayed.

Wait times on the phone are usually shorter during off-peak hours (early morning, late evening, or weekday afternoons). If you are calling from abroad, check whether your airline offers a local phone number for your country — international calls can be expensive.

Enable text and email alerts from your airline

Most airlines offer automatic notifications by text message or email when your flight status changes. You can turn these on during booking or afterward in your airline account settings. Once enabled, you will receive a message if your flight is delayed, cancelled, or reboarded to a different gate. This is the easiest way to stay informed without checking repeatedly.

Check your spam folder if you do not see alerts — they sometimes land there by mistake. If alerts are not working, log into your airline account and confirm your phone number and email address are correct and that notifications are switched on.

Understand what "on time" means

A flight is considered on time if it departs within 15 minutes of the scheduled departure time shown on your ticket. This is the official definition used by the U.S. Department of Transportation. A flight that leaves at 2:15 p.m. when scheduled for 2:00 p.m. is technically on time. However, airlines often show a revised departure time on their boards if they know a delay is coming, so you may see the time change before the 15-minute window.

Arrival time is separate from departure time. A flight can depart on time but arrive late due to weather or air traffic control delays en route. Check both the departure and arrival times on your airline's status page to understand the full picture.

What to do if your flight is delayed

If your airline shows a delay of 30 minutes or more, contact the airline when ready to understand the reason and expected resolution time. Ask whether the airline is offering a rebooking on an earlier flight, a later flight, or a different airline. Some airlines automatically rebook you; others require you to request it.

If the delay is more than three hours, you may be may have access to to compensation under U.S. law, though rules vary by airline and reason for delay. Weather and air traffic control delays typically do not may have access to, but mechanical issues and crew scheduling problems often do. Ask the airline about compensation before you leave the airport, or contact them afterward with your flight number and delay documentation.

Frequently Asked Questions

How often does the flight status update online?

Most airline websites and apps update every 5 to 15 minutes. Airport departure boards update more frequently, sometimes every 2 to 3 minutes. If you are checking from home, refresh the page every 10 minutes as your departure time approaches. The closer you get to departure, the more often the status may change.

Can I check my flight status without a confirmation number?

Yes. Most airlines allow you to search by flight number and last name instead. Go to the airline's website, select "Check Flight Status," and enter the flight number (found on your ticket or booking email) and the last name on the ticket. This works even if you booked through a third-party site.

What if the airline website says on time but the airport board says delayed?

Trust the airport departure board. It reflects real-time coordination between the airline and airport operations. The airline's website may not have updated yet, or there may be a gate delay or ground crew issue that does not show online. Ask an airline representative at the gate for the most current information.

Do I need to be at the gate before the departure time shown online?

Yes. You must be at the gate and boarded before the scheduled departure time. Airlines close the gate 10 to 15 minutes before departure. If the board shows a new departure time, that is when the plane will actually push back from the gate, not when boarding ends. Arrive at your gate at least 30 minutes before the scheduled time to be safe.

What happens if I miss my flight because of a delay?

If your connecting flight was delayed and you missed your next flight, contact your airline when ready. Most airlines will rebook you on the next available flight at no charge if the delay was their responsibility. Bring your boarding pass and the flight number of the delayed flight. If you missed your flight for other reasons, rebooking fees may explore.