Can You Bring a Knife on a Plane? Rules by Departure
Knife rules differ by departure country and destination. Compare Canadian and UK screening, US restrictions, checked packing and prohibited types.
Sources and scope
Source-based research; no hands-on test or specialist review claimed.
Canadian small-blade exception excludes US flights and prohibited knife types.
Departures screened by CATSA; page modified 2026-02-25
Knives and other sharp objects; Prohibited KnivesSource review: · Codex (AI source review)
Sharp/pointed knives are prohibited in UK hand luggage, independently of the 6 cm threshold.
UK airport security
Other personal items: Knife rowSource review: · Codex (AI source review)
TSA pocket and utility knife classifications; limited cutlery exception.
US TSA screening; official indexed listing accessed; individual item URL returned 403
Pocket Knife; Swiss Army Knife; Utility Knives/KnifeSource review: · Codex (AI source review)
A knife is not subject to one worldwide carry-on rule. Check every airport where you will pass security, the destination's possession/import rules, and the airline. A permission at your first checkpoint does not cover a connection.
Screening rules checked for this guide
| Journey or authority | Carry-on position |
|---|---|
| Canada, domestic or international non-US | CATSA permits certain knives with blades no longer than 6 cm; prohibited knife types remain excluded |
| Canada to the US | CATSA prohibits knives of any type or length in carry-on |
| UK airports | GOV.UK excludes knives with a sharp or pointed blade and/or a blade longer than 6 cm |
| US TSA screening | Pocket knives and utility knives belong in checked baggage; the TSA list describes a limited exception for plastic or round-bladed butter knives |
Sources: CATSA sharp objects, UK personal items and TSA knife listings. The UK rule does not mean every blade shorter than 6 cm is allowed: the sharp/pointed condition matters too.
Checked baggage is not permission to possess a prohibited knife
CATSA identifies automatic-opening and concealed knife types as prohibited. Do not use the checked-bag column as permission to import or carry an illegal item. For an unusual knife or destination, obtain a decision from the relevant authority before packing.
Where carriage is permitted, sheath or securely wrap a sharp blade to protect baggage handlers and inspectors. Screening staff make the checkpoint decision; airline acceptance is a separate check.
A practical connection example
A traveller carrying a 5 cm knife from Canada to a non-US destination may meet CATSA's small-blade rule, yet still fail a later UK screening check if the blade is sharp or pointed. List each screening point before deciding where to pack it.
For multi-tools, identify the actual blade and mechanism rather than relying on a “travel-friendly” label. When the exact type or connection rule is unresolved, leave the item out until the authority confirms it. This guide covers the named authorities only and does not give a global legal clearance.
Frequently asked questions
Are all knives banned from carry-on everywhere?▾
No. CATSA permits certain blades up to 6 cm on Canadian domestic and non-US international flights, but not on flights to the US. UK and US rules differ.
Can every knife go in checked luggage?▾
No. Prohibited knife types, possession and import restrictions still apply. Confirm the exact item and destination before packing.
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