There are many flights that go to the Dominican Republic from DC. The most popular airlines are JetBlue, American, and United. All of these airlines fly direct to the Dominican Republic. The average flight time is about 5 hours. The flight prices vary depending on the airline and the time of year. The average flight price is around $700. The best time to visit the Dominican Republic is during the winter months. This is when the weather is the coolest and the prices are the cheapest.