SFO → CCUSan Francisco to Kolkata

live

Direct flights from San Francisco (SFO) to Kolkata (CCU): 7 nonstop departures observed each week across 1 airline. 75% of the last 8 operated flights arrived within 15 minutes of schedule. The median arrival is 16 minutes early. No cancellations were recorded across the 8 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 San Francisco and Kolkata. Updated 17 August 2026 at 20:47 UTC.

SFO San Francisco heavy · +31
CCU Kolkata tracking
12,578 km · ~16h 38m est.
departs 10:307x weekly
Runs mixed · 1 airline · 7x weekly · nonstop
75% on time

of the last 8 operated SFO → CCU flights arrived within 15 minutes

Median arrival delay is −16 min. 0 of 8 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Search live fares for this route →
Median arrival−16 minacross the last 8 operated legs
Flight time~16h 38mestimated from route distance
Weekly departures7x1 direct airline on the leg

Current nonstop fares

SFO → CCU · one way · economy · 1 adult

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TodayChecking…Direct airline fares
TomorrowChecking…Direct airline fares
In one weekChecking…Direct airline fares

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 IndiaAI75% on time

Flights AI4174 10:30 daily

History

operated legs · board outcomes
08-17AI4174departed+65
08-16AI4174dep +49 → arr−22
08-15AI4174dep +64 → arr−19
08-14AI4174dep +13 → arr−79
08-13AI4174dep +51 → arr−16
08-12AI4174dep +34 → arr−36
08-11AI4174dep +57 → arr−14
08-10AI4174dep +16 → arr+38

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
SFOSan Francisco +31 min heavy 🌤 mostly cloudy · N 9 kt Full SFO delay board →
CCUKolkata tracking Full CCU delay board →

How the San Francisco to Kolkata route actually runs

Pro Flight Search tracks every published board update for nonstop SFO to CCU flights: 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. Fares link straight to the operating airline with no markups.

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

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

SFO to CCU questions

Is SFO–CCU running on time right now?

Some delays possible. The departure side at SFO is the weaker end, route health score 58/100. The airports section above carries the live status and delay window at both ends.

How long is the flight from SFO to CCU?

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 SFO–CCU fly?

Air India runs the route with about 7 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.

What does the route health score measure?

A blend of departure-side delay at SFO and arrival-side delay at CCU, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.