It’s generally more expensive to depart on a Monday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.
Travelers have found it’s best to book a flight 41 days in advance to save up to 11% 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 St Louis to San Juan 1-2 weeks in advance for as low as $380, or $415 for flights within the next 24 hours.
September can be a great time to fly to San Juan from St Louis with a flight ticket averaging about $380. Cheapflights users have found deals in the month of September for as cheap as $194. The most expensive prices can be found in the month of December.
One of the essential ways to save on airfare from St Louis to San Juan is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 29% on airfare.