To save up to 18% on this flight, we recommend booking at least 20 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Harrisburg to St Lucia from $739 1-2 weeks out and tickets from $898 for flights departing within the next 72 hours.
Flights from Harrisburg to St Lucia lean towards being more expensive in December. Prices are generally better when you fly from Harrisburg to St Lucia in March, with the cheapest ticket starting at $472.