Good question. Asking this question only make sense if you think UFO's are space ships with live crews on board. If you think they might be mirages of some kind, then they don't have to come from anywhere. Other than Earth, nowhere in our solar system looks like it can support much life. Mercury is airless, waterless, and very very hot. Venus is not much cooler, the surface of Venus is hot enough to melt lead. Mars is nearly airless and cold. Jupiter is a gas giant with no solid surface anywhere near the top of the atmosphere. Jupiter's satellites are unpromising for life. Ditto for Uranus and Neptune. Uranus satellite Titan might support some weird kind of life that lives at temperatures far below water ice. Pluto is frozen solid, colder than frozen.
Perhaps they come from another star system. The physics we know now limits everything to traveling at light speed or less. There might be an advanced physics that permits faster than light travel but we have not found it yet. The closest star is Alpha Centauri, four and a skosh light years away. The others are all much further. Gotta wonder about what sort of culture sets out on four year or more (each way) trips all that often.
Suppose they have faster than light? I would expect an alien ship boosting up to light speed or braking down from light speed to show a very bright glare from her engines. Something easily seen from earth. Some years ago we launched a Saturn 5 after dark. The glare from it's engines, just kerosene and LOX, lit up the entire east coast of the US. I have no idea how faster than light engines might work, but I expect they would use more power than simple chemical engines. And there is always some waste energy that comes out as light. Which is why I expect an alien faster than light drive to be super obvious in operation.
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