Cathay Pacific flight from UK domestic baggage ticket only gave 20KG, called to ask if I can add baggage ticket said no, so can I buy baggage ticket at the airport? The cost?

Cathay Pacific's checked baggage allowance is free of charge: generally 32kg (70lbs)1 If checked baggage exceeds 32kg (70lbs), passengers must notify Cathay Pacific in advance at the time of booking/reservation and approval must be obtained. If, at check-in, any baggage is found to be in excess of the limit (except: mobility aids, medical equipment, sports equipment, musical instruments, checked pets, and diplomatic baggage), the passenger must reconfigure the baggage in real time to comply with the requirements before the baggage can be arranged for check-in.

If the total dimensions of your checked baggage (length+width+height, in any pair) exceeds 203 centimeters (80 inches) in length, you must notify us in advance at the time of booking/reservation and approval must be obtained.

2 Infants are defined as passengers under 2 years of age and not occupying a seat.

3Applicable to all passengers traveling to, through or from the United States, Canada and selected Central and South American countries.

4 The following items, regardless of their actual size, are considered to be one piece of baggage of 158 centimeters (62 inches) in size:

A sleeping bag or rolled up bedroll

A backpack

A pair of skis, a pair of poles, and a pair of ski boots, or a snowboard and a pair of ski boots

A golf bag containing One golf bag containing golf clubs and a pair of golf shoes

One canvas bag or IATA 22 bag (soft-sided zippered bag with side zippers)

One properly wrapped bicycle (non-electric, single-seat touring or racing bicycle) - steering wheel must be secured to the side and balanced on the frame and pedals must be removed

One pair of standard wakeboards or one slalom wakeboard

Properly wrapped fishing gear, including two fishing rods, one fishing reel, one plunge net, one pair of fishing shoes, and one fishing tackle box

Shooting sports firearms gear including (but not exceeding):

One rifle case containing not more than two rifles, 5 kilograms (11 pounds) of ammunition, a shooting mat, muffler and small rifle tools; or

Two shotguns and two shotgun cases; or

One pistol case containing not more than five pistols, 5 kilograms (11 pounds) of ammunition, silencers, a pistol scope and small pistol tools.

Carrying such firearms is subject to conditions and regulations. We recommend that you refer to the Dangerous Goods page and then contact our Reservations Department for more details.

Any portable musical instrument not exceeding 100 centimeters (39 inches) in length.

Special rules for excess baggage:

If individual checked baggage exceeds 32 kilograms (70 pounds) in weight or 203 centimeters (80 inches) in length (length+width+height), passengers must be notified and approved in advance at the time of booking/reservation.

If any baggage exceeding the maximum weight limit is found at the time of check-in, the passenger is required to reconfigure the baggage to comply with the regulations before the baggage can be arranged for check-in. Exceptions: sports equipment, musical instruments, checked pets, mobility aids, medical equipment and diplomatic baggage. Free checked baggage can also be redeemed with Cathay Pacific Membership Points!