Where can one book a flight to Puerto Rico?

* Online travel agencies (OTAs): OTAs such as Expedia, Priceline, and Kayak aggregate flights from multiple airlines and allow you to book flights online.

* Airline websites: Most airlines have their own websites where you can book flights directly.

* Travel agents: Travel agents can help you book flights and take care of other travel arrangements such as hotels and car rentals.

* By phone: You can also book flights over the phone by calling the airline directly or through a travel agency.