Is it safe to fly with a leg ulcer?

Yes: Your swelling may get worse when you fly so it is impt. To wear compression socks to help control it. Leg ulcers are primarily related to elevated venous pressure so this needs ot be addressed.

OK with precautions: If it is a venous ulcer, most likely at your age keeping swelling down with compression and getting up and walking the isle some, if you can get an exit row seat to stretch your legs out and exercise your ankle. If space get your leg up in empty seats too. For most other ulcer types pressure would not be good but be sure if it is draining you have plenty of fluid absorption.

Wear compression: If it is a venous ulcer wear compression stockings to minimize the effect of the relatively low pressure in an airplane cabin.

Leg ulcers: yes but I would recommend use of a compression stocking during airplane travel, even if he did not have an ulcer. If the ulcer secondary to vein disease, I would recommend that you be evaluated to determine the source of the vein disease and have that treated. This will give you long-term benefits of management.