Cheap flights from Kastamonu to Istanbul from $65 KFS → IST
Kastamonu (KFS) → Istanbul New Airport (IST)
The cheapest return found recently is $85 with Turkish Airlines, 30 Dec – 3 Jan 2027, found 6 days ago. The cheapest one-way found recently is $65 with Turkish Airlines, 13 Nov, found 2 days ago.
- Cheapest one-way found recently
- $65, Turkish Airlines, found 2 days ago
- Cheapest return found recently
- $85, 30 Dec to 3 Jan 2027
- Cheapest month to fly
- December 2026, one-way fares from $40 found in the last 7 days
- Airlines with nonstop flights
- Turkish Airlines
- Shortest nonstop flight found
- 1 h 30 min
Return
Not enough comparable prices yet for a usual return price.
Cheapest return found recently
$85
30 Dec – 3 Jan 2027 · Turkish Airlines
Kastamonu (KFS) → Istanbul New Airport (IST)
Leaves 4:05 p.m. · Return leaves 2:00 p.m. · 2 h 50 min of travel, both ways together
out nonstop, back nonstop
found 6 days ago
Cheapest nonstop return
$85
30 Dec – 3 Jan 2027 · Turkish Airlines
Kastamonu (KFS) → Istanbul New Airport (IST)
Leaves 4:05 p.m. · Return leaves 2:00 p.m. · 2 h 50 min of travel, both ways together
out nonstop, back nonstop
found 6 days ago
Found recently, and the cheapest we hold
$85 30 Dec – 3 Jan 2027found 6 days agoSee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 24 days, 19 Oct to 11 Nov, the cheapest return we saw each day was $70 to $86.
24 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good return price?
Not enough comparable prices yet: we hold return fares on 1 departure date and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other 4-night return fares leaving within 3 days of 30 Dec to compare.
Every date we hold
1 fares on 1 departure dates
See every date as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 30 Dec – 3 Jan 2027 | $85 | Turkish Airlines | Kastamonu (KFS) → Istanbul New Airport (IST) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
Airlines on the cheapest dates: Turkish Airlines.
One-way
The cheapest one-way fare on each of 4 departure dates is usually $53 to $65.
Cheapest one-way found recently
$65
13 Nov · Turkish Airlines
Kastamonu (KFS) → Istanbul New Airport (IST)
Leaves 4:05 p.m. · 1 h 30 min trip
nonstop
found 2 days ago
Cheapest nonstop one-way
$65
13 Nov · Turkish Airlines
Kastamonu (KFS) → Istanbul New Airport (IST)
Leaves 4:05 p.m. · 1 h 30 min trip
nonstop
found 2 days ago
Found recently, and the cheapest we hold
$65 13 Novfound 2 days agoOpen this trip
$40 30 Decfound 6 days agoOpen this trip
What have prices looked like?
Over 46 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $33 to $62.
At $65, the cheapest one-way found recently is above that range.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 4 departure dates from 13 Nov to 30 Dec, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
No. We hold one-way fares on 1 other departure date within 3 days of 13 Nov, and it is not cheaper.
Every date we hold
4 fares on 4 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 13 Nov | $65 | Turkish Airlines | Kastamonu (KFS) → Istanbul New Airport (IST) | nonstop | found 2 days ago | Open this trip |
| 15 Nov | $66 | Turkish Airlines | Kastamonu (KFS) → Istanbul New Airport (IST) | nonstop | found 6 days ago | Open this trip |
| 18 Nov | $57 | Turkish Airlines | Kastamonu (KFS) → Istanbul New Airport (IST) | nonstop | found 4 days ago | Open this trip |
| 30 Dec | $40 | Turkish Airlines | Kastamonu (KFS) → Istanbul New Airport (IST) | nonstop | found 6 days ago | Open this trip |
Which month looks cheapest?
December 2026 is the cheapest month — from $40.
Airlines on the cheapest dates: Turkish Airlines.
Premium cabin fares from Kastamonu to Istanbul
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 30 Dec – 3 Jan 2027 in another cabin: Premium economy · Business · First
Today's prices for 13 Nov in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Kastamonu to Istanbul?
Return
Not enough history yet: in 24 days of return prices, 19 Oct to 11 Nov, fewer than 3 booking ranges had prices on 7 days or more.
One-way
Fares 60 to 89 days before departure were typically 26% lower than 0 to 6 days before departure.
From the cheapest one-way each day between 24 Sept and 11 Nov (46 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $53 | $39 | +36% | 41 |
| 7–13 days | $47 | $39 | +21% | 36 |
| 14–29 days | $49 | $33 | +26% | 16 |
| 30–59 days | $40 | $38 | +3% | 11 |
| 60–89 days | $39 | $34 | Cheapest seen | 16 |
| 90–179 days | $60 | $60 | +54% | 7 |
| 180+ days | $68 | $68 | +74% | 7 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
One-way
Sinop → Istanbul
129 km from Kastamonu
$89
$24 more than flying from Kastamonu
3 Jan 2027 · NOP → IST · nonstop
found 4 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 30 Dec – 3 Jan 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Kastamonu to Istanbul?
The cheapest return found recently is $85 with Turkish Airlines, 30 Dec to 3 Jan 2027, found 6 days ago.
How much is a one-way flight from Kastamonu to Istanbul?
The cheapest one-way found recently is $65 with Turkish Airlines, 13 Nov, found 2 days ago. The cheapest one-way we hold, of any age, is $40 with Turkish Airlines, 30 Dec, found 6 days ago. The cheapest one-way fare on each of 4 departure dates is usually $53 to $65.
What is the cheapest month to fly from Kastamonu to Istanbul?
December 2026 is the cheapest month for a one-way, from $40, 30 Dec, found 6 days ago.
How far ahead should I book a flight from Kastamonu to Istanbul?
In 46 days of prices between 24 Sept and 11 Nov, one-way fares 60 to 89 days before departure were typically 26% lower than 0 to 6 days before departure.
Is there a direct flight from Kastamonu to Istanbul?
Yes, the cheapest nonstop return found recently is $85 with Turkish Airlines, 30 Dec to 3 Jan 2027, found 6 days ago. The cheapest nonstop one-way found recently is $65 with Turkish Airlines, 13 Nov, found 2 days ago.
How long is the flight from Kastamonu to Istanbul?
The cheapest nonstop one-way found recently, with Turkish Airlines on 13 Nov, takes 1 h 30 min from Kastamonu (KFS) to Istanbul New Airport (IST).
Which airlines have the cheapest flights from Kastamonu to Istanbul?
Between 13 Nov and 30 Dec, Turkish Airlines has the cheapest one-way on all 4 departure dates we hold.
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