Quick rules for flying with helmet in carry-on and checked baggage. Verdicts and conditions across the major aviation regions below.
Allowed in both. Often easier to attach to outside of carry-on bag.
Bike / motorcycle / ski helmets allowed in both. Most EU carriers permit helmet separately in addition to standard carry-on.
Allowed in both. Many UK carriers permit helmet in addition to carry-on.
Allowed in both. Carry-on policy varies by carrier.
Bike / motorcycle / ski helmets allowed in both. Carry-on: most airlines let you carry a helmet separately (in addition to standard carry-on) — confirm with carrier. Common at popular motorcycle destinations (Thailand, Vietnam, Bali).
Allowed in both. Most Australian + NZ carriers permit a helmet in addition to standard carry-on for cyclists / motorcyclists.