AirHint found the following cheapest return flights from Kolkata (CCU) to San Francisco (SFO) in May 2026 (see full year).

Return flights

02 May - 26 May	Singapore Airlines
06 May - 13 May	Singapore Airlines
01 May - 25 May	Singapore Airlines
08 May - 24 May	Singapore Airlines
13 May - 27 May	Singapore Airlines
08 May - 12 May	Qatar Airways
26 May - 09 Jun	Qatar Airways
01 May - 26 May	Qatar Airways
01 May - 30 May	Singapore Airlines
02 May - 30 May	Singapore Airlines
12 May - 19 May	Air India
01 May - 04 Jun	Qatar Airways

Also check the deals for one-way flights from Kolkata to San Francisco in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Kolkata to San Francisco in May from 668€

Return flights