To save up to 7% on this flight, we recommend booking at least 19 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Key West to Puerto Rico from $262 1-2 weeks out and tickets from $281 for flights departing within the next 72 hours.
Flights from Key West to Puerto Rico lean towards being more expensive in December. Prices are generally better when you fly from Key West to Puerto Rico in August, with the cheapest ticket starting at $121.