A passenger whose head was stuck in a bus window while he was trying to get some fresh air was rescued by onlookers.

Sundar Rao was sticking his head through the gap to enjoy the breeze blowing on his skin as he travelled in the city of Srikakulam in Andhra Pradesh State, India.

But when Sundar decided to return to his seat he realised his head had become stuck in the narrow window.

Co-passengers reportedly struggled for 15 minutes to help free him during the incident on January 23.

After a while, the driver parked the State Road Transport Corporation (APSRTC) bus in the nearby town of Tekkali, where they received the assistance of locals.

Phone footage shows bystanders and other passengers trying to squeeze Sundar's head back into the bus.

Some could be heard laughing in the background at the hapless Sundar as he patiently allowed a few people aboard the bus to pull his head back.

Meanwhile, several men outside pushed back on the window glass to try and create more space. They were then able to free his head from the window safely.