Tickets at this price are available for departures starting as soon as next week through the end of February, with return flights valid through the end of March.
This is TAP Air Portugal's discount fare, which only includes a carry-on bag plus one personal item. Other restrictions apply. Consider their basic fare for $70 more roundtrip if you need a checked bag or would like to choose a specific seat.
Searching on TAP's site, I found seats departing JFK on Monday, February 11 and returning from SVQ on Wednesday, February 20, 2019. Other travel dates are widely available in late January and February.
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Need a barber or a room in Seville? We can help you out with the second part, here's what's on sale for the mentioned from Hotelwatchdog.