Exceptional1 stop · 17.5h
BOS to BKKThailand
Bangkok
$506
usually $1,140
−56%
Most monthly lows $915–$1,187. Cheaper than every other month on record (5).
- Travel dates
- 7 Mar '27 – 17 Apr '27 · 41 nights
- Airline
Turkish Airlines· $18 per 1,000 km
Flights · BOS → SEL
Boston to Seoul
Best fare, round trip
$1,217
Too little price history on this route to compare — the fare is shown as found.
Found
- Depart
- Mon 1 Feb
- Return
- Mon 8 Feb
- Stay
- 7 nights
- Flight
- 2 stops · 21h
- Airline
American
Cached fare — the booking search re-prices live before you pay.
South KoreaSeoulPalaces wedged between skyscrapers, barbecue smoke at midnight, cafés that outnumber people.Best windowApr–May · Sep–OctAirportsIncheon (ICN) · Gimpo (GMP)Every route into SeoulFare seasonality
When this route gets cheap.
The cheapest itinerary we are tracking makes 2 stops and takes about 21 hours outbound, on a 7-night trip — ticketed under American, which on a connecting fare need not operate every leg. At $1,217 for 10,942 km each way, that works out to about $56 per 1,000 km flown. That is above the $44 per 1,000 km typical of long-haul fares here. Across the 26 departure cities we track at a similar distance from Seoul, this fare ranks 25th — 2.6× the $460 we hold from Athens. For context, the middle fare among the 22 routes of similar length we watch out of Boston is $1,090. We have 3 months of cached prices for this route so far — not enough to call a fare cheap or expensive, so we publish the price without a percentage. Fare history here is still too short to name a cheap season. The best time to be in Seoul: Apr–May · Sep–Oct.
The 2 days we hold a cached fare for
Press a date to compare its fares
The median cached fare across this calendar is 21% higher than when tracking began on 18 Aug — $1,069 then versus $1,291 now, across 13 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 $910, on 15 Sep.
These are the only days we have a cached price for on this route so far — not the only days it flies. The search above covers any date.
Cached fares · checked 17 Oct 2026
We are still collecting this route's months — 3 months of cached prices so far, too few to chart.
Route facts
- Airports
- Logan (BOS) ↔ Incheon (ICN) · Gimpo (GMP)
- Flight time
- ≈21 hours outbound
- Distance
- ≈10,942 km each way
- Airlines on the board
- American
- Itineraries
- Connections on current fares
- Best months to visit
- Apr–May · Sep–Oct
Good to know
BOS → SEL, answered.
How far in advance should I book BOS → Seoul?
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. Our guide Why flight prices change covers the levers we can measure.
Are there nonstop flights from Boston to Seoul?
The current cheapest fares involve a connection, ticketed under American. We hold no nonstop fare on this route right now, which does not mean none flies — search your exact dates to see what does.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on 17 October). 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 Seoul?
Lock the flight first — then compare stays for 1–8 Feb '27 · 7 nights.
Browse hotelsMissed it?
Cached fares expire. This route has a feed of its own — follow it and the next BOS → SEL drop reaches you as soon as we find it.
Follow this route’s feedKeep browsing
Related routes on the board.
Rare1 stop · 17h
BOS to TYOJapan
Tokyo
$910
usually $1,730
−47%
Most monthly lows $1,262–$1,730. Cheaper than every other month on record (3).
GreatNonstop · 8.5h
BOS to ISTTürkiye
Istanbul
$518
usually $800
−35%
Most monthly lows $760–$892. Cheaper than every other month on record (8).
RareNonstop · 13h
SFO to SELUnited States
San Francisco
$648
usually $1,355
−52%
Most monthly lows $802–$1,357. Cheaper than every other month on record (3).
RareNonstop · 3h
TYO to SELJapan
Tokyo
$112
usually $225
−50%
Most monthly lows $190–$228. Cheaper than every other month on record (9).
Rare1 stop · 11.5h
BRU to SELBelgium
Brussels
$476
usually $800
−41%
Most monthly lows $664–$814. Cheaper than every other month on record (5).
