Atlanta (ATL) to San Juan (SJU): 1,548 miles (2,491 km) great-circle, about 3h 35m nonstop by our estimate. Cheapest fare observed: $213 round-trip on Frontier, with 1 stop, departing July 24, 2026.
$213 round-trip, Frontier F91102, departing 2026-07-24 at 20:12, returning 2026-07-27. The recorded itinerary left on a Friday, returning on a Monday 3 nights later; the fare was observed 90 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $213, it ranked 16th of the 30 round-trip fares we recorded from ATL (median $212). That is 13.8 cents per great-circle mile (round-trip price over one-way distance), below the ATL median of 15.8 cents across 30 round-trip routes.
Routes from ATL of similar length: Guadalajara (1,469 mi) at $266 and San Salvador (1,425 mi) at $603.
Frontier had the cheapest fare on 18 of 30 ATL routes. It is the 16th longest of the 30 routes we track from ATL.
Of 20 departure airports with a fare to San Juan, Atlanta (ATL) ranked 12th at $213. Lowest: $127 from Orlando (MCO); highest: $632 from Washington DC (IAD); 7 nonstop. Cheapest-fare airlines (routes): Frontier (9), Spirit (4), American Airlines (2), JetBlue (2), Southwest (1) and United Airlines (1), plus 1 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, America/Puerto_Rico; flight time is our estimate.