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Both Delta and American Airlines have round trip airfares travelling from Phoenix (PHX) to San Juan Puerto Rico (SJU) for $ 315, making 1 stop for a little over an hour only. These are basic economy fares, a restricted-type fare. You do have an option to upgrade to main cabin before final checkout.

Travel Availability:

Departs PHX: 4-6, 10-11, 13, 18-20, 25, 28; Oct 22; Nov 6; Jan 7-9, 11-12, 14-15, 17-19, 21-25, 28-29, 31; Feb 1-5, 8, 11-12, 15, 18-19, 22, 25-26
Returns: wide availability returns, generally 7 days works best