Six flights to central and southern islands were cancelled or delayed Sunday due to the thickening smog, after thousands were left stranded over the past 10 days.
Pilots flying in the central city of Cebu could only see eight kilometres (five miles) ahead, said government weather observer John Agbay, adding that visibility was also impaired in the western island of Palawan.
Indonesian forest fires are an annual occurence, but dry weather has made them particularly bad this year and Malaysia, Singapore, Australia and Japan have all sent help to fight the blazes.
While the haze in the Philippines has been mild compared to other parts of Southeast Asia, the smoke has been largely unexpected as the islands affected lie thousands of kilometres away from the fires.
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