der Flug
flight
Movement through the air, especially a journey by airplane from one place to another.
Der Flug von Frankfurt nach New York dauert etwa acht Stunden.
The flight from Frankfurt to New York takes about eight hours.

flight
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flight
Movement through the air, especially a journey by airplane from one place to another.
Der Flug von Frankfurt nach New York dauert etwa acht Stunden.
The flight from Frankfurt to New York takes about eight hours.

The noun 'der Flug' (flight) is derived directly from the verb 'fliegen' (to fly). This connection helps you remember the word: 'fliegen' describes the action, while 'der Flug' describes the result or the journey itself.
Wir fliegen morgen nach Spanien.
We are flying to Spain tomorrow.
The context reveals the meaning: If people are talking about a trip, it means a flight by airplane. If it is about sports or physics, it refers to the trajectory of an object. In connection with animals, it describes a flying group.
Ich habe einen günstigen Flug nach Lissabon gefunden.
I found a cheap flight to Lisbon.
In the context of air travel, there are fixed combinations: You can book a flight, cancel a flight, or take a direct flight. If a flight is delayed, you say: 'Der Flug hat Verspätung' (The flight is delayed).
Wir mussten unseren Flug leider stornieren.
Unfortunately, we had to cancel our flight.
To describe the route of an air journey, the combination 'der Flug von ... nach ...' (the flight from ... to ...) is almost always used.
Der Flug von Berlin nach Mallorca dauert nur zwei Stunden.
The flight from Berlin to Mallorca only takes two hours.
train / track
'die Bahn' and 'der Flug' can both describe a journey. The most important difference is the means of transport. 'die Bahn' means a journey or trip by train, S-Bahn, or subway on rails. 'der Flug' means a journey by airplane through the air. They can be confused because both appear in travel planning, tickets, and departure or arrival times. If it is about a station and rails, you say 'Bahn'. If it is about an airport and airplane, you say 'Flug'.

Sie hat den Flug vor dem Wochenende noch schnell gebucht.
She quickly booked the flight before the weekend.
Nach München nehme ich lieber die Bahn, weil der Bahnhof nah ist.
I prefer taking the train to Munich because the station is nearby.