Route brief · SEL → HAN
Seoul → Hanoi
$133
−46% vs typical
seasonal median $245 · difference $112
Sep 5 – Sep 8 · 3 nights
Jeju AirNonstop
- Usual monthly lows
- $177–$265
- Board rank
- Stronger than 94%
- Route sample
- 6 observed months
Cached fare — the booking search re-prices live before you pay.
Destination briefHANHanoiOld-quarter alleys, motorbike tides and the country’s best food — and Ha Long Bay two hours out.Best windowOct–Nov · Mar–AprAirportsNoi Bai (HAN)All routes into HanoiWhen this route gets cheap.
Cached-fare history: across 6 months, Sep is the cheapest for SEL → HAN. Best time to be there: Oct–Nov · Mar–Apr.
Fares bottom out in September around $133 and peak in March near $265 — a $132 spread across the 6 months we track. The cheapest itinerary we are tracking flies Jeju Air nonstop and takes about 5 hours outbound, on a 3-night trip. At $133 for 2,742 km each way, that works out to about $24 per 1,000 km flown. That is well under the $39 that medium-haul fares on this board typically run. Of the 4 departure cities we track at a similar distance from Hanoi, this is the cheapest right now — 34% under the next one, Singapore.
Cheapest day in the next 3 months: Sep 9 · $127 (38% below median)
Tap any day → live search
The median cached fare across this calendar is 14% lower than when tracking began on Aug 8 — $208 then versus $178 now, across 5 recorded snapshots. This is a calendar-level trend, so an individual deal above can be lower. The lowest single day we have seen here is $127, on Sep 9.
Cheapest in Sep · around $133
46% below the $245 typical fare
Cheapest round-trip fare found per month · Seoul → Hanoi · cached-price history
Route facts
- Airports
- Incheon (ICN) · Gimpo (GMP) ↔ Noi Bai (HAN)
- Flight time
- ~5 hours outbound
- Distance
- ~2,742 km each way
- Typical price
- $245 round-trip (seasonal median)
- Airlines on the board
- Jeju Air
- Itineraries
- Nonstop available
- Best months to visit
- Oct–Nov · Mar–Apr
SEL → HAN, answered.
Is $133 a good price for Seoul to Hanoi?
Yes — the seasonal median for this route is around $245 round-trip. At $133 you're 46% below that, saving about $112, which we rate rare for this route.
What is the cheapest month to fly from Seoul to Hanoi?
Across 6 months of cached-fare history, Sep comes out cheapest on this route. The best months to actually be in Hanoi are Oct–Nov · Mar–Apr — when those overlap, that's your window.
How far in advance should I book SEL → Hanoi?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. What we can measure is which month is cheap: across 6 months of cached fares, Sep comes out lowest on this route. See /guides/what-moves-a-flight-price/ for what does move a fare.
Are there nonstop flights from Seoul to Hanoi?
Yes — the current board includes nonstop fares (Jeju Air). The outbound leg runs around 5 hours.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on September 1). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in Hanoi?
Lock the flight first — then compare stays for Sep 5 – Sep 8 · 3 nights.
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Missed it?
Cached fares expire. This route has a feed of its own — follow it and the next SEL → HAN drop reaches you as soon as we find it.
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