Mostar is often better overnight than rushed as a stop
Mostar can absolutely work as a day trip, but it often becomes more memorable when you stay overnight and let the city breathe a little. The main visual identity is strong enough to impress quickly, yet the old town and river atmosphere usually feel far more enjoyable once the middle of the day thins out. That is why the overnight question is really about trip style, not just checklist efficiency.
Who benefits most from staying?
Couples, slower travelers, photographers, and anyone building a Bosnia-focused route usually get more value from an overnight. Staying gives you the quieter evening and morning rhythm that day-trippers miss, and that matters in a place where atmosphere is a big part of the appeal. It also makes the stop feel less transactional and more like a proper part of the trip.
When a day trip is enough
If the route is already packed and the goal is just to see the bridge, the old town, and have one meal before moving on, then a day trip can still work. The city is compact enough that you can understand the main core quickly. But that approach tends to give you the busiest version of Mostar rather than the best version of it.
Why the evening matters
Mostar becomes stronger once the trip slows down. Evening light, quieter streets, and a less crowded dinner window do a lot to shift the mood. For many travelers, that is exactly the moment the city starts to feel special rather than simply photogenic.
How to decide
If your route already includes Sarajevo or southern Croatia and you want one more atmospheric overnight stop, Mostar is often worth it. If the schedule is too tight and the stop would become stressful, a day trip may be enough. The city rewards an overnight most when the whole point is mood, not just movement.
The practical answer
If you can spare the night, Mostar is usually worth staying overnight. It gives the city room to feel more distinctive and much less crowded, which is exactly what many travelers are hoping for when they add it to a Balkans itinerary in the first place.