Is it safe to get orthognathic surgery and a rhinoplasty at the same time?

As other posters have noted, a LeFort I procedure in the same setting as a Rhinoplasty is probably not advisable. The primary reason is disruption in blood supply and potential loss of support for the nose.

There is a great deal of facial swelling associated with orthognathic surgery and nasal swelling with rhinoplasty, which can lead to airway complications.
After rhinoplasty the nose is very swollen and patients are unable to breath through their nose and must breath through their mouth. However, if orthognathic surgery is done at the same time as the rhinoplasty, the patient will be unable to sufficiently breath through their mouth due to facial and oral swelling from the orthognathic surgery.
It is best to avoid possible airway complications and have the surgeries done separately to ensure you will be able to breath through at least your nose or mouth.

It would be best to have each procedure performed separately, as bite correction and rhinoplasty may both be complex surgeries depending on your individual needs. It may be best to have the bite correction taken care of first, as orthognathic surgery can change the movement of the nose. Hope this helps answer your question. Thank you and best of luck to you.