Fly Air Seoul to Guam and the checked bag rules change on you. The Air Seoul baggage allowance on that route jumps to 23 kg and two pieces. That is more than double what the airline includes on every other international route.
Most travelers researching the Air Seoul baggage allowance assume one number applies everywhere. On this airline, that assumption is the mistake.
Carry-on: one bag, one small extra, one shared weight limit
Air Seoul allows one carry-on bag up to 115 cm total. That is length plus width plus height, with sides no larger than 55 by 40 by 20 cm. The stated weight cap is 10 kg, or 22 lbs, straight from Air Seoul’s own site.
Passengers may also bring one small item, such as a handbag, a laptop bag, or reading material. Air Seoul is explicit that both pieces share the same 10 kg total. A heavy laptop bag can eat into the space you meant for your rolling case.
The Air Seoul baggage allowance by route
Checked baggage on Air Seoul cannot exceed 203 cm in total linear size. The free weight included depends entirely on where you are flying. Here the Air Seoul baggage allowance stops being one policy and becomes three.
| Route | Free checked weight | Pieces included |
|---|---|---|
| Domestic (within South Korea) | 15 kg (33 lbs) | 1 |
| International (Japan, China, Hong Kong, Southeast Asia) | 10 kg (22 lbs) | 1 |
| Guam | 23 kg (50 lbs) | 2 |
That 10 kg figure for most international routes is thin next to full service carriers. One pair of shoes packed on top of clothing can push a bag over it. Guam sits apart because Air Seoul prices that route closer to a long US flight than to its short hops around Asia.
What excess baggage costs
Air Seoul prices extra weight by the route, and by whether you pay online or at the airport. Domestic overage runs 8,000 KRW per 5 kg if prepaid. At the airport counter it is 3,000 KRW per kg instead, so prepaying ahead is the cheaper move.
International overage is billed in 5 kg blocks, and the price climbs with distance. Expect roughly 4,000 JPY for Japan, 350 CNY for China and Hong Kong, and 60 USD for Southeast Asia, if bought 48 hours before departure. On the Guam route, extra weight is billed by the 23 kg piece instead, at 40 USD early or 45 USD close to departure.
Checking a bag at the gate instead of online adds a separate charge. That runs 10,000 KRW per piece domestically and 20,000 KRW, about 20 USD, internationally, on top of any weight fee. Sports gear such as skis, bikes, and surfboards carries a flat 20,000 KRW item charge as well.
What travelers actually run into
Air Seoul does not publish gate by gate enforcement data. No Air Seoul specific enforcement thread turned up in this research pass either. The closest honest comparison comes from other Korean low cost carriers.
Forum posts there describe the same 15 kg checked and 10 kg carry-on split Air Seoul uses at home. Counter staff weigh bags and charge on the spot for anything over. Budget on being weighed at check-in rather than hoping a heavy bag slides through.
A merger is coming, the rules are not changed yet
Air Seoul and its sister low cost carrier are both being folded into Jin Air under the Korean Air group. Completion is targeted around 2027. Until then, the Air Seoul baggage allowance above is what applies, read straight off Air Seoul’s own site.
Check back closer to the merger date. Baggage policy is often one of the first things airlines line up after combining.
The bottom line
The honest bottom line on the Air Seoul baggage allowance is that it rewards route awareness. Pack to 10 kg for carry-on no matter where you fly. Expect only 10 kg free checked baggage on most international routes, and remember Guam is the outlier with 23 kg and two pieces.
If you are also weighing Korean Air’s baggage rules or Asiana’s own allowance for a connecting itinerary, compare the numbers before you pack. A regional low cost peer like Zipair’s baggage policy follows a similar pay as you go structure. It helps to see how carry-on sizes get measured across the industry before you buy a bag that almost fits.
Run your numbers through the baggage cost calculator before booking. Check the Air Seoul baggage page for any update after your travel dates.
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