This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $415 fare is the cheapest current round-trip from Chicago (MDW) to SJU on Frontier flight F92999, departing 2026-09-18 at 12:54 with return on 2026-09-22.

Clicking "Book this flight" opens Kiwi.com with this exact flight pre-filtered — same airline, same dates, same passenger count.