What Do I Do If I Miss My Flight? Act in This Order

A missed flight is urgent, but the useful response is orderly: contact the airline, preserve the booking, confirm the replacement flight, then deal with bags and overnight needs. The cause of the miss matters. An airline-caused delay is handled under the carrier's disruption policy; arriving late on your own is handled under the ticket and fare rules. Do not assume those situations receive the same remedy.

What do I do if I miss my flight?

1. Contact the operating airline immediately. Use its app, website, messaging channel, reservations line, kiosk, or airport service desk. If you are already in the terminal, open a digital channel while you walk to an agent.
2. Ask whether the booking is still active. Name every remaining segment you need protected, including an onward connection and the return. Delta's official missed-flights page warns that its entire itinerary, including the return trip, may be cancelled after a missed flight.
3. Check for automatic rebooking. Look in the airline's trip-management screen before buying anything. American Airlines directs affected passengers to its app, website, or airport kiosk to view a new trip or select a different flight.
4. Confirm the new flight and boarding pass. A proposed itinerary is not useful until you know you have a confirmed seat or whatever status the airline assigns, a current boarding pass, and the correct departure airport and terminal.
5. Trace the checked bag. Tell the agent that a bag was checked and ask where it is being routed. American says it reroutes bags automatically when a passenger checks in for new flights, but you should still verify the bag record for your own itinerary.
6. Save the result. Screenshot the replacement itinerary, boarding pass, bag receipt, and any written airline message so they remain available without a network connection.

This sequence protects the original reservation before you create a second one. It also gives the airline a chance to apply its own contract and disruption policy. Rules change, so confirm the current terms with the operating airline before flying or accepting a replacement.

First decide why the flight was missed

The practical question is not just whether the aircraft departed. It is who caused the broken itinerary and whether the flights were held in the same reservation.

Situation	What the official pages establish	Your next move
You arrived too late for your first flight	Delta says a missed flight may lead to cancellation of the entire itinerary, including the return.	Contact the airline immediately and ask it to keep or restore every remaining segment before purchasing a replacement.
An airline delay broke a connection on the same itinerary	American says it rebooks a passenger when its cancellation or delay causes the missed connection. Delta publishes a similar commitment for a misconnection.	Check the trip record for automatic rebooking, then ask for another available option if the proposed trip does not work.
The missed flight was on a separate reservation	The fetched disruption pages do not promise protection across an unrelated booking.	Contact both ticket issuers. Ask the first about its disrupted flight and the second whether the unused booking can still be preserved or changed.
You are unsure whether the airline or passenger caused the miss	The carrier's record contains the operating times and booking status.	Ask the operating airline to explain how it coded the disruption and what rule it is applying.

A single reservation is the record containing the flights sold together. Separate reservations may look like one journey on your calendar while remaining independent tickets in airline systems. Avoid claiming that one carrier must protect another carrier's separate ticket unless that carrier confirms it for your case.

If the airline caused the missed connection

Start with the airline that operates the disrupted flight. American Airlines states that if its flight is cancelled or a delay causes a missed connection, it will rebook the passenger on the next flight with available seats. Its page says the replacement can be reviewed in the American app, on its website, or at an airport kiosk.

Delta's Customer Service Plan says that when a passenger has misconnected, it will rebook that passenger on the next available Delta flight at no additional cost. It also says that if a Delta flight is unavailable, it will arrange an alternative on an airline with which it has a ticketing agreement. Those are carrier-specific commitments, not a universal promise that every airline follows identical rules.

Before accepting a new route, read the whole itinerary. Confirm the destination, airport, connections, cabin, and date displayed in the booking. If the airline offers a replacement you do not want, ask what alternatives and refund choices apply before rejecting or cancelling it. Keep the conversation tied to the operating carrier's published terms.

If you missed the flight because you were late

Move quickly even when the cause was traffic, parking, a long security queue, or arriving at the wrong terminal. Delta tells passengers who cannot make a flight to contact the airline immediately to review options and update the itinerary. The important danger is not only the departed flight: an untouched missed segment can affect later flights in the same booking.

Use direct, specific language with the agent: say that you missed the flight, provide the confirmation code, and ask whether the remainder of the itinerary is active. Then ask what change, standby, credit, or new-ticket options apply to your fare. Do not present any of those as guaranteed; the airline must interpret its current contract and your ticket.

If an online tool shows no useful option, keep the booking open and speak with the carrier. Buying a separate replacement first can leave you managing two records, two bag routings, and uncertainty about the return. If you do buy a new ticket after the airline explains the original booking, keep the confirmation separate and verify which carrier now controls each bag and segment.

What happens to checked baggage?

Ask about the bag explicitly. Show the bag-tag receipt and have the agent confirm its destination in the updated record. American says it reroutes checked bags automatically when the passenger checks in for new flights. That statement describes American's process; it does not prove that every carrier handles every missed-flight bag the same way.

If you reach the destination without the bag, follow the operating airline's baggage-reporting process. If you misplaced an item rather than checked baggage, ownership of the location matters. TSA says its Lost & Found contacts cover items left at security checkpoints or missing from checked baggage. For property left elsewhere in an airport, TSA directs travellers to the airport's website.

Do you need to go through security again?

If you remain inside the secure side of the terminal and the replacement gate is reachable airside, follow airport signs and the airline's directions. If you leave the secure area, change to a terminal without an airside route, or return on another day, plan to enter through the checkpoint again. TSA describes passenger screening as the process intended to stop prohibited items and other threats from entering the sterile area, meaning the gate-side zone beyond screening.

Recheck anything you bought or repacked before returning. Under the TSA 3-1-1 liquids rule, carry-on liquids, aerosols, gels, creams, and pastes are limited to containers of 3.4 ounces or 100 milliliters or less per item inside a quart-sized bag, subject to the exemptions TSA lists. Items can also receive additional screening.

What to ask the airline agent

• Is my original reservation still active?
• Are my onward and return flights protected?
• Have I already been rebooked, and is the new itinerary confirmed?
• What alternatives does my ticket allow if the proposed route does not work?
• Where is my checked bag, and is its destination updated?
• Must I change terminals or pass through security again?
• If the disruption was within the airline's control, what assistance does its published policy provide for this case?

Write down the answer or save it in the app. If the itinerary changes again, the latest confirmed record is more useful than a remembered conversation.

Before you leave the airport

Do a final document check. Make sure the boarding pass matches the replacement flight, the bag tag is linked to the right destination, and the remaining trip still appears in the reservation. Download the terminal map and keep the airline's contact channel available offline where possible. For a connection, review what happens after a missed connecting flight. For a broader disruption plan, see flight cancellations and delays. If you need to move through an unfamiliar terminal, use the guide to navigating an airport.

The calm version of this problem is simple: preserve the booking first, verify the new itinerary second, and spend money only after the airline explains your status and options.