Flights: Baggage Rules and Hidden Fees

There is no single baggage allowance

It is easy to assume that a checked bag and a cabin bag come with a fairly standard weight and size limit across airlines. They do not. Each airline sets its own allowance, and within one airline it often changes by fare class, so the cheapest fare on a route can come with no free checked bag and sometimes only a small personal item allowed in the cabin, while a slightly more expensive fare on the same flight includes a full checked bag. Reading the baggage allowance attached to the specific fare booked, rather than assuming it matches a previous flight with the same airline, avoids an unpleasant surprise at the airport.

Where the real cost differences appear

Extra or oversized baggage fees are usually structured to reward planning ahead. Adding a checked bag during booking or shortly afterwards, through the airline's own website, is typically cheaper than adding it later, and both are usually far cheaper than paying at the airport check-in desk or, worse, at the boarding gate. A bag that is slightly over the weight or size limit can also trigger a separate excess charge on top of the standard baggage fee, so weighing luggage at home before travelling is a small habit that avoids a larger cost at the airport.

What happens if a bag is lost, damaged or delayed

On international flights, an airline's liability for lost, damaged or delayed baggage is capped by an international treaty, the Montreal Convention, rather than being unlimited. This cap exists regardless of what the traveller paid for the flight or the bag's actual value, which is one reason travel insurance or a credit card's own travel cover is often used to fill the gap for higher-value items. Filing a report with the airline at the airport, before leaving the baggage claim area, is generally required to make a claim at all, so this is not something that can be done conveniently later from home.

Delay compensation and baggage are usually separate

Passenger rights rules in the EU and the UK, generally referred to by their regulation numbers, cover situations such as denied boarding, flight cancellation and long delays, and can provide compensation in those cases. They do not generally cover baggage problems, which fall under the separate international liability framework described above. It is worth knowing which situation applies, since the claims process and the body responsible differ.

Checking before booking, not after

The baggage section of a fare's terms is usually shown during booking, before payment, and is worth reading in full rather than skipping past. For a return trip, it is also worth checking whether both directions offer the same allowance, since some itineraries combine flights operated by different partner airlines, each with its own rules. Travel comparison sites sometimes list a voucher code or coupon code for extra baggage add-ons or for the booking itself, and checking a listing on daily-coupons.info before paying can be worth doing alongside checking the allowance, rather than instead of it. More on our approach is on the how it works page.

Cabin bags are not always free either

On some low-cost fares, only a small personal item that fits under the seat is included, and a standard cabin bag placed in the overhead locker is charged separately, sometimes at a similar price to a checked bag. This detail is easy to miss when comparing headline fares between airlines, since a lower ticket price can be offset entirely by mandatory cabin bag fees once the actual luggage needed is added. Comparing the total cost with baggage included, rather than the fare alone, gives a more realistic picture of which option is actually cheaper.

A short checklist before flying

• Check the baggage allowance for the exact fare booked, not the airline in general.
• Add extra baggage online in advance rather than at the airport.
• Weigh bags at home to avoid an overweight charge at check-in.
• Report a lost, damaged or delayed bag at the airport before leaving the baggage area.