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http://www.heyportugal.com/index.php?option=com_content&view=article&id=355%3Aflights-schedules-from-portugal&catid=47%3Atravel&Itemid=130
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These are the current 2011 flight schedules for the most popular destinations, from Portugal airports. We will update it when we can, but as flights change so often if you find anything wrong then please let us know.
Winter Schedule are usually October to March and Summer March to October.
Source: Hey Portugal