French low-cost airline Corsair is offering return flights to the Caribbean from their home base at Paris Orly airport for as little as $160. Dates available in fall 2020, mainly September and October.
Assuming international travel becomes possible again by September, this is an amazingly good deal, with a CPM of only 1,8 cents per mile flown.
The routing is a bit inconvenient: the outbound flight has an overnight layover in Montreal, and the inbound flight has two layovers in Barbados and Guadeloupe. But if you can handle the annoyance, the price is hard to beat.
The deal can be booked on GoToGate.com – here is a screenshot of the itinerary with sample dates
Only a few seats are still available at this price, so book quickly!