When to Go Where in 2019

In general, 2019 should be a particularly good year to visit the Caribbean. Several airlines have increased service to the islands, including those that have recovered from major damage brought by Hurricane Irma in September 2017, like St. Martin and St. Thomas.

“The Caribbean has experienced a strong recovery, which is likely driving interest in 2019,” Mr. Solomito said.

Travel when it’s cheapest

Research shows that, across the board, January is the cheapest month, on average, to fly both domestically and internationally. September is close behind.

Hipmunk’s data specifically shows that flights within the U.S., on average, are 31 percent lower in January compared to peak summertime prices.

“It’s the start of a new year, people are motivated to be back at work, the kids are back at school, it’s usually cold — it’s just not a high-traffic travel time and flight prices reflect that,” said Kelly Soderlund, Hipmunk’s travel trends analyst. “However, if you’re on a budget or just hate crowds, it’s a fantastic time to cross some cities off your bucket list.”

If you can’t get vacation plans settled this early in the year, consider “shoulder season,” which starts in September.

“Shoulder season typically brings with it lower consumer demand outside of the Thanksgiving, Christmas and New Year’s weeks, which means overall lower prices for those trips between summer and the holiday season,” Ms. Corwin said.