CCU → SFOKolkata to San Francisco

live

Direct flights from Kolkata (CCU) to San Francisco (SFO): 7 nonstop departures observed each week across 1 airline. 56% of the last 9 operated flights arrived within 15 minutes of schedule. The median arrival is on schedule. No cancellations were recorded across the 9 tracked flights. The nonstop covers 12,578 km, an estimated 16 hours 38 minutes in the air. Measured by Pro Flight Search from live flight boards at Kolkata and San Francisco. Updated 16 September 2026 at 09:57 UTC.

CCU Kolkata smooth · +12
SFO San Francisco smooth · +5
12,578 km · ~16h 38m est.
dep bank 04:20–15:057x weekly
Runs rough · 1 airline · 7x weekly · nonstop
56% on time

of the last 9 operated CCU → SFO flights arrived within 15 minutes

Median arrival delay is +1 min. 0 of 9 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival+1 minacross the last 9 operated legs
Flight time~16h 38mestimated from route distance
Weekly departures7x1 direct airline on the leg

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Air India

Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.

Who flies it

observed on the boards · 7 days
Air IndiaAI56% on time

Flights AI173 04:20 daily · AI183 15:05 Tu Th Sa

History

operated legs · board outcomes
09-16AI173dep +11 → arr−28
09-15AI173dep +17 → arr−21
09-14AI173dep +11 → arr+1
09-13AI173dep +20 → arr−16
09-12AI173dep +52 → arr+34
09-12AI183dep +106 → arr+92
09-11AI173dep +64 → arr+42
09-10AI173arrived−10
09-10AI183arrived+40

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
CCUKolkata +12 min smooth Full CCU delay board →
SFOSan Francisco +5 min smooth Full SFO delay board →

How the Kolkata to San Francisco route actually runs

Pro Flight Search records official board updates for nonstop CCU to SFO flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.

Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — Kolkata (CCU) to San Francisco (SFO) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/CCU-SFO
How we measure this →

CCU to SFO questions

Is CCU–SFO running on time right now?

Smooth skies ahead. The departure side at CCU is the weaker end, route health score 87/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on CCU–SFO?

Operators schedule morning departures around 04:20 from CCU. Earlier flights typically land before destination-airport delays accumulate later in the day; check the SFO delay card to confirm conditions when you'd arrive.

How long is the flight from CCU to SFO?

Great-circle distance is 12,578 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 918–1108 min gate-to-gate on this route.

How often does CCU–SFO fly?

Air India runs the route with about 10 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.