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Please advise us of your flight when it is known.
Does this sentence sound good?
How about "Please advise us of your flight details as soon as they are available"?
advise: West's Encyclopedia of American Law (Full Article) from Answers.com. It could be acceptable to use "advise" this way, but I recognized immediately that it was rather odd and confirmed this by checking the dictionary usage note.
Considering these points, here are some possible rewrites:
Please, tell us when you have your flight details.
Please, tell us when you know your flight number.
Please, tell us when you have some information about your flight.
Please, tell us when you have more information about your flight.
Please, tell us when you know more about your flight.