Can I do a 'border bounce' and return to India the same day?

Technically no. Indian immigration will likely flag a same-day return, and you risk being denied entry or interrogated.

Is the Sonauli border crossing safe?

It is busy and chaotic but generally safe. Avoid using unofficial 'fixers' who offer to speed up your process for a fee; do it yourself at the official windows.

How to execute a Nepal visa run from India

Cross the border by land at Sonauli or take a direct flight from Delhi to Kathmandu to reset your Indian tourist visa clock. You must remain outside of India for at least two months before re-entering if you are on a standard 180-day Indian tourist visa, though this rule is inconsistently enforced.

Check your visa conditions. Verify if your Indian visa is 'multi-entry'. If it is not, you cannot re-enter India regardless of how long you stay in Nepal. Ensure you have not exceeded your 180-day annual limit.
Choose your crossing method. For a land crossing, take a bus to the Sonauli border (near Gorakhpur). For a faster route, fly from Delhi (DEL) to Kathmandu (KTM), which takes 1.5 hours.
Clear immigration. Exit India by getting your passport stamped at the border immigration office. Obtain your Nepal visa-on-arrival at the border or airport ($30 for 15 days).
Stay the required duration. The Indian government technically requires a two-month gap between visits for tourist visa holders. Do not try to re-enter India the next day; spend at least 60 days in Nepal to be safe.

Can I do a 'border bounce' and return to India the same day?: Technically no. Indian immigration will likely flag a same-day return, and you risk being denied entry or interrogated.
Is the Sonauli border crossing safe?: It is busy and chaotic but generally safe. Avoid using unofficial 'fixers' who offer to speed up your process for a fee; do it yourself at the official windows.