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Istanbul to Seoul in April 2027 IST, SAW → GMP, ICN

Istanbul New Airport (IST), Sabiha Gokcen International Airport (SAW) → Gimpo International Airport (GMP), Incheon International Airport (ICN)

For departures in April 2027, the cheapest return found recently is $558 with China Southern Airlines, 26 Apr 2027 – 8 May 2027, found today.

Return

In April 2027, the cheapest return fare on each of 9 departure dates is usually $568 to $904. Across all 48 departure dates we hold on this route, it is usually $557 to $696. Of the 8 months with enough return fares to compare, April 2027 is usually the most expensive.

Cheapest return found recently

$558

26 Apr 2027 – 8 May 2027 · China Southern Airlines

Istanbul New Airport (IST) → Gimpo International Airport (GMP)

out 1 stop, back 1 stop

found today

See prices for these datesCheck today's price

Cheapest we hold, of any age

$545

5 Apr 2027 – 15 Apr 2027 · China Southern Airlines

Istanbul New Airport (IST) → Gimpo International Airport (GMP)

out 1 stop, back 1 stop

found 4 days ago

See prices for these datesCheck today's price

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The cheapest dates in April 2027

DatesFromAirlineStopsFound
5 Apr 2027 – 15 Apr 2027$545China Southern Airlinesout 1 stop, back 1 stopfound 4 days agoSee prices for these dates
26 Apr 2027 – 8 May 2027$558China Southern Airlinesout 1 stop, back 1 stopfound todaySee prices for these dates
3 Apr 2027 – 17 Apr 2027$568China Southern Airlinesout 1 stop, back 1 stopfound todaySee prices for these dates
4 Apr 2027 – 17 Apr 2027$666China Southern Airlinesout 1 stop, back 1 stopfound 6 days agoSee prices for these dates
22 Apr 2027 – 23 Apr 2027$803MIAT Mongolian Airlinesout 1 stop, back 1 stopfound 2 days agoSee prices for these dates

Every date we hold

9 departure dates

2 Apr 2027 – 16 Apr 2027: $904, found today3 Apr 2027 – 17 Apr 2027: $568, found today4 Apr 2027 – 17 Apr 2027: $666, found 6 days ago5 Apr 2027 – 15 Apr 2027: $545, found 4 days ago7 Apr 2027 – 20 Apr 2027: $893, found today9 Apr 2027 – 23 Apr 2027: $904, found today22 Apr 2027 – 23 Apr 2027: $803, found 2 days ago23 Apr 2027 – 23 Apr 2027: $1,160, found 2 days ago26 Apr 2027 – 8 May 2027: $558, found todayApr
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
2 Apr 2027 – 16 Apr 2027$904Sichuan AirlinesIstanbul New Airport (IST) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound todaySee prices for these dates
3 Apr 2027 – 17 Apr 2027$568China Southern AirlinesIstanbul New Airport (IST) → Gimpo International Airport (GMP)out 1 stop, back 1 stopfound todaySee prices for these dates
4 Apr 2027 – 17 Apr 2027$666China Southern AirlinesIstanbul New Airport (IST) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
5 Apr 2027 – 15 Apr 2027$545China Southern AirlinesIstanbul New Airport (IST) → Gimpo International Airport (GMP)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates
7 Apr 2027 – 20 Apr 2027$893Sichuan AirlinesIstanbul New Airport (IST) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound todaySee prices for these dates
9 Apr 2027 – 23 Apr 2027$904Sichuan AirlinesIstanbul New Airport (IST) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound todaySee prices for these dates
22 Apr 2027 – 23 Apr 2027$803MIAT Mongolian AirlinesIstanbul New Airport (IST) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
23 Apr 2027 – 23 Apr 2027$1,160Turkish AirlinesIstanbul New Airport (IST) → Incheon International Airport (ICN)out nonstop, back nonstopfound 2 days agoSee prices for these dates
26 Apr 2027 – 8 May 2027$558China Southern AirlinesIstanbul New Airport (IST) → Gimpo International Airport (GMP)out 1 stop, back 1 stopfound todaySee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $462.

October 2026From $5815 departure dates27 Oct – 9 Dec · found 7 days agoSee prices for these dates
November 2026From $4685 departure dates5 Nov – 18 Nov · found 20 hours agoSee prices for these dates
December 2026From $462Cheapest seen5 departure dates11 Dec – 8 Jan 2027 · found 7 days agoSee prices for these dates
January 2027From $4953 departure dates10 Jan 2027 – 18 Jan 2027 · found 5 days agoSee prices for these dates
February 2027From $5763 departure dates24 Feb 2027 – 10 Mar 2027 · found yesterdaySee prices for these dates
March 2027From $54311 departure dates20 Mar 2027 – 3 Apr 2027 · found 2 days agoSee prices for these datesEvery date in March 2027
April 2027From $5459 departure dates5 Apr 2027 – 15 Apr 2027 · found 4 days agoSee prices for these dates
May 2027From $6325 departure dates24 May 2027 – 29 May 2027 · found 2 days agoSee prices for these dates
June 2027From $5531 departure date15 Jun 2027 – 26 Jun 2027 · found 7 days agoSee prices for these dates
July 2027From $5491 departure date1 Jul 2027 – 12 Jul 2027 · found 6 days agoSee prices for these dates

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work