Travelers have found it’s best to book a flight 41 days in advance to save up to 38% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 41 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Philadelphia to Serbia 1-2 weeks in advance for as low as $913, or $984 for flights within the next 24 hours.
Due to multiple factors, expect to potentially pay more when booking in June. For low rates, March can be a great choice for travel to Serbia. Flights to Serbia from Philadelphia in March are about $745 on average during March, but can be found for as low as $440.