I just checked Copa, and as an example, depart SDQ on 17 Dec and return 31 Dec. the ticket including taxes was US$578 RT. In my experience, they do not charge change fees, but a change is subject to open seats. Their flights tend to get full about a week in advance, and Christmas time will fill up too.
I did not check for any specials, but the connections are good, and Copa has always been ontime, and never a lost bag for my travels with them.
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