To secure cheap flights from Watertown International Airport (ART) to Key West International Airport (EYW) in April, start by searching flexible dates +/- 3 days and compare departures through nearby hubs such as Syracuse (SYR), Rochester (ROC) or Boston (BOS). Use fare alerts on Google Flights or Skyscanner, book 6–10 weeks ahead for April travel, and consider mid-week departures to avoid weekend premium pricing. Mix-and-match carriers or book separate segments (e.g., ART→SYR + SYR→EYW) when it reduces cost, but allow generous layover time. Check low-fare sales from American and JetBlue for EYW connections and confirm baggage rules to avoid surprise fees. Call to action: compare ART to EYW fares now, set a price alert, and book early to capture the best April savings.