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Frontier Airlines, an ultra low-cost ‘no frills’ airline have a promotional code good for 90% off round trip flights between select cities in the US, including Puerto Rico.
Frontier Airlines [flyfrontier.com]
Valid Tuesday and Wednesday
Buy by 1/27/20
Fly 4/21 – 5/19/20
*Discount shown is for nonstop round-trip travel between United States and Puerto Rico on specific dates in select markets. Seats are limited. Restrictions apply.