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The Baloch Liberation Army (BLA), a separatist militant group, claimed responsibility for the attack.
The threat triggered tightened security checks on trains and at railway stations.
27 others were injured as an autorickshaw carrying schoolchildren bore the brunt of the bomb.
The accused confessed to the police that he only attempted to get the flight cancelled, and there was no other motive. However, police are looking into other angles as well.
The arrested, Shubham Upadhyay, reportedly sent two bomb threats to draw attention after watching similar news stories.
In just 12 days, more than 275 flights from Indian carriers have been subjected to hoax bomb threats, primarily communicated via social media.
Most of these alerts were sent to the X handles of the airlines.
The threatening messages reached the airlines' 'X' (formerly Twitter) accounts hours after both flights had departed.
According to PTI, over 90 flights have received bomb threats this week.
Cochin International Airport (CIAL) conducted a bomb threat assessment after a social media post targetted Alliance flight 9I 506 COK-BLR.
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