If the Earth is flat - how it’s possible:
You can make the following flights, starting at 9am, finishing at 3pm (or earlier) and staying at the hotel till the next day:
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London, Uk => New York => Los Angeles => Tokyo => Doha => London, UK
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The above series of trips starts and ends in the same place.
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All the time, while flying, you’ve got the Sun on the left hand side.
You can only explain that in 2 ways:
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Earth is a globe as we know it, or
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Earth is flat, but then it needs to have a shape of a donut where the sun is in the center of it, so you fly around it.
The second would mean: when you fly South of London you should cross the middle of a donut (which is the Sun) after 12 hours of trip.
Let’s fly towards the sun:
London, UK => South Africa => the Sun.
Unfortunately, after 12 hours you end up in an extremely cold area.
Allas8 answered your question fully, and provided a picture!
The bigger point you are missing is that IF the world is flat then it is obviously possible. Asking how it is possible is largely irrelevant.
IF the world is flat then every observation we make, occurs on a flat earth. Even if we can’t explain why/how (in this case it is easy to explain/imagine/conceptualize how - in any case)