For Business Class flights, the cheapest month to fly this route is September. The most expensive months are June and November.
In terms of precipitation, rainfall in Costa Rica ranges from 0.0 - 300.0 inches per month. September is typically the wettest month, when rainfall can reach 300.0 mm. February is typically the driest time to visit Costa Rica when rainfall is around 0.0 mm.
If weather is an important factor for your trip to Costa Rica, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 18.0 C).
Booking a Business Class flight 3 days in advance of your planned departure date is, on average, the best time to get cheap flights to Costa Rica. The general trend is that the closer you book to the departure date, the more expensive your flight will be.