The ‘Airfare Drops After Chuseok’ Myth — Korea’s Fuel Surcharge Just Jumped Two Tiers (October 2026 Ticketing)

Note: This article was automatically translated from Korean by AI. All content refers to South Korea unless otherwise stated. See Korean original for the most accurate reading.

Bottom line — The claim that airfares drop once Chuseok, Korea’s autumn harvest holiday, is over applies at best to base fares. The fuel surcharge added on top of ticket prices by South Korea’s national carriers has actually risen two tiers for October-issued tickets, landing at tier 23. On Korean Air’s routes departing South Korea, that’s KRW 49,000 to KRW 362,600 (roughly USD 35–260) one-way. Compared with August — peak summer season — the surcharge on the Incheon–Bangkok route alone rose 63%. Just as important: the trigger isn’t the day you fly, it’s the day you issue the ticket.

October Tickets Land at Tier 23 — Two Tiers Above September

For tickets issued between October 1 and 31, 2026, the international fuel surcharge on flights departing South Korea sits at tier 23 under the national-carrier tier system, up two tiers from September’s 21. This tiered structure applies specifically to Korea’s national carriers — Korean Air and Asiana Airlines — while foreign airlines set their own separate surcharge schedules. Korean Air charges KRW 49,000 to KRW 362,600 (about USD 35–260) depending on flight distance; Asiana Airlines charges KRW 53,400 to KRW 301,200 (about USD 38–215).

The two-tier increase doesn’t land evenly across every route, though. Below is a direct comparison of Korean Air’s nine distance bands against September’s published rates.

Source: Korean Air’s international fuel surcharge notice (departures from South Korea) and Air Travel Info’s October fuel surcharge summary (as of September 2026). The “Change” column is the two published rates subtracted directly.

Seven of the nine bands rose and two fell. The steepest increase was the 3,000–3,999 mile band, which includes Incheon–Denpasar, up KRW 12,000. By contrast, the 500–999 mile band including Incheon–Osaka fell by just KRW 200, and the Incheon–Paris/Los Angeles band fell KRW 3,500.

[Inference] The tier itself is uniform across all routes, yet the won amounts diverge — likely because the fuel surcharge is set in US dollars first, then converted to won using the average exchange rate over the same period used to calculate the reference fuel price. Korean Air’s own notice specifies this conversion process. In other words, a headline saying the tier rose doesn’t automatically mean your specific route got more expensive.

The Trigger Isn’t the Calendar — It’s 150 Cents a Gallon

Korea’s fuel surcharge system has no concept of peak or off-peak season. The sole benchmark for national carriers is the monthly average price of Singapore jet fuel. On international routes, the surcharge kicks in once that price crosses 150 cents per gallon, and the tier shifts with every 10-cent move up to the cap of tier 33. Domestic routes within Korea use a blunter scale — a 120-cent floor and 20-cent tier steps.

The reference window for October’s international rate ran from August 16 to September 15. Over that period, Singapore jet fuel averaged 377.54 cents per gallon, or USD 158.57 per barrel — up 6.22% from the prior period’s USD 149.29. A 6% rise in fuel prices was enough to push the tier up two notches. Domestic Korean routes run on a separate reference window from international ones, so the two can move in opposite directions even within the same month.

Worth flagging: domestic surcharges stayed flat at KRW 20,900 in October. Because international and domestic routes use different thresholds and step sizes, they can diverge in direction even in the same month. That KRW 20,900 figure applies to Korea’s major carriers — budget carriers sometimes post different amounts, so it’s worth checking the fare breakdown on the booking screen.

From Spring to Now, the Tier Swung From 6 to 33

In 2026, Korea’s fuel surcharge has moved more than fivefold in just six months since spring. It tripled from tier 6 in March to tier 18 in April, then hit tier 33 — the maximum tier for passenger fuel surcharges — in May. It then fell for three straight months to tier 14 by August, before climbing back seven tiers to 21 in September.

Bars show each tier as a share of the maximum tier (33). The numbers are authoritative; the bars are illustrative. Source: monthly coverage compiled from Travel Times and SBS Biz (Korean-language sources).

That swing means someone who bought a ticket in summer and someone buying now pay very different amounts. Comparing the same routes between August and October tickets makes the gap clear.

The Trigger Is the Ticketing Date, Not the Flight Date

This is where confusion most often sets in. Under Korean Air’s and Asiana Airlines’ published rules, the fuel surcharge applies based on the date the ticket is issued — not the travel date. Book a flight departing next February today, and September’s tier-21 rate applies; book it on October 1, and tier 23 applies instead. That said, some carriers reference the payment date instead, so it’s worth checking your specific airline’s notice.

The reverse holds too: if the surcharge rises after you buy but before you fly, you won’t be charged the difference — and if it falls, you won’t get a refund. It locks in at the moment of purchase.

Three more things worth knowing:

• Published rates are one-way. A round trip departing from and returning to South Korea typically carries double this amount. A journey originating overseas, however, follows that origin’s published rate rather than South Korea’s.
• The only exemption is infants under age two who don’t occupy a seat. There is no discounted tier.
• Rates differ by airline. Even at the same tier 23, Korean Air’s ceiling is KRW 362,600 while Asiana Airlines’ is KRW 301,200.

Take a family of four booking a round-trip Incheon–Da Nang journey on Korean Air. A one-way difference of KRW 6,700, multiplied by four passengers and two direction legs, works out to a KRW 53,600 gap between September and October ticketing. That gap multiplies further with more passengers or connecting legs. As a fixed cost that moves independent of season, it resembles Korea’s monthly-shifting electricity billing tiers in character.

Check the “October Is Off-Season” Assumption First

To avoid confusion, it helps to separate two components. Total airfare breaks down roughly into base fare, fuel surcharge, and airport facility fees, among others. It’s the base fare that tracks the season — when demand falls, airlines release more discounted fare classes, so the same seat costs less. The fuel surcharge, by contrast, moves purely with fuel prices and exchange rates, independent of demand.

Seasonal demand itself is well documented. According to Incheon International Airport Corporation figures, total summer peak-season passengers (July 25–August 10) this year reached 3,916,084 — a daily average of 230,358, up 5.8% from 217,831 a year earlier.

The issue is the premise that October itself is off-season. This October contains two separate three-day weekends.

• October 3 (Saturday) — National Foundation Day (Gaecheonjeol). Because it falls on a Saturday, October 5 (Monday) becomes a substitute holiday, creating a three-day break from the 3rd to the 5th.
• October 9 (Friday) — Hangeul Day, Korea’s alphabet holiday, which runs into the weekend for a three-day break from the 9th to the 11th.

Demand could plausibly concentrate around at least these two windows. Of course, two three-day weekends alone can’t tell us how demand behaved across the full month of October — that requires monthly passenger statistics once they’re published. Likewise, whether base fares on any specific route actually fell this October can’t be confirmed without route-level, date-level published data. What this article confirms is limited to the fuel surcharge alone; where the total fare moved is left an open question.

Practically speaking, here’s what’s at stake: the swing between ticketing in September versus October ranges from a KRW 3,500 saving to a KRW 12,000 addition per one-way ticket on Korean Air. Multiply that by passenger count and legs, then weigh the total against whatever change or cancellation fees would apply to shifting your itinerary. For a family of four’s round-trip to Da Nang, that’s KRW 53,600 — whether that exceeds a rebooking fee depends entirely on your fare conditions. Often, the bigger savings come from fixing a recurring monthly cost instead, the way restructuring a Korean MVNO mobile plan can be.

[Remaining uncertainty] November’s tier will be set using Singapore jet fuel’s average price from September 16 to October 15, which isn’t known yet. The won conversion will again depend on the average exchange rate over that same window. Given that the tier has swung by as much as twelve steps in a single month this year, the direction can’t be assumed in advance.

Frequently Asked Questions

If I book on September 30 but fly in October, which tier applies?

September’s tier 21 applies. Korean Air’s and Asiana Airlines’ published rules key off the ticketing date — the day the e-ticket is issued — not the travel date. For bookings where payment date and issue date diverge (waitlisted confirmations, travel-agency bookings, split payments), check your specific airline’s applicable rule, since the two dates can differ.

Do award tickets booked with miles still carry the fuel surcharge?

Yes. Even bonus (mileage) tickets are charged the fuel surcharge, taxes, and airport facility fees separately in cash. The only exemption is infants under age two who don’t occupy a seat. The amount follows the same distance-based published rate as paid tickets.

Why didn’t the domestic Korean surcharge rise?

Domestic routes within Korea have a higher trigger threshold (120 cents/gallon) and a blunter step size (20 cents per tier) than international routes, so the same fuel-price move shifts the tier less. October’s domestic rate stands at KRW 20,900 nationwide on major carriers, unchanged from September. Budget carriers sometimes post separate rates.

If the tier rises, does that guarantee my route gets more expensive?

No. In October’s case, two of Korean Air’s nine distance bands actually fell. That’s because converting a dollar-denominated amount into won doesn’t move identically across every band. Check your specific distance band on the airline’s published table rather than relying on the headline tier number.

Bottom Line

Whether it’s true that airfares fall once Chuseok passes can’t be answered from public data alone — there’s no route-level data available to confirm which direction base fares moved. What’s confirmed here is a single component: the fuel surcharge added on top of ticket prices rose two tiers to 23 for October-issued tickets, and compared with August-issued tickets during peak summer, that adds 63.7% more on Incheon–Bangkok, 45.3% more on Incheon–Da Nang, and 39.9% more on Incheon–New York. On top of that, this October contains two separate three-day weekends, which makes the premise that October is simply off-season harder to accept at face value.

A more reliable approach: first compare total fares for your intended travel date, then treat whether the ticketing date crosses into a new month as a secondary factor. The fuel surcharge is only one part of the total, and what sets it is the price of jet fuel per gallon and the exchange rate — not the calendar. What most booking screens don’t spell out, though, is that the applicable rule is the ticketing date, not the flight date.

This article does not recommend any specific airline or ticketing timing. Published rates change monthly, and won conversions shift again with the exchange rate. Check your own route’s distance band on the airline’s official published table before deciding.

Primary sources: Korean Air international fuel surcharge notice · Korea’s Ministry of Land, Infrastructure and Transport (MOLIT) Air Portal fuel-price and exchange-rate statistics · Incheon International Airport Corporation statistics · Air Travel Info · Travel Times · SBS Biz. Figures without other labeling reflect September–October 2026 ticketing; August ticketing figures used for comparison are labeled where cited.

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