The most popular route from USA to Lucknow is Newark - Lucknow Amausi. You may also consider New York John F Kennedy Intl - Lucknow Amausi or Chicago O'Hare Intl - Lucknow Amausi.
The cheapest flight price from USA to Lucknow is $1056. On average you can expect to pay $1295. The most popular route, (Newark - Lucknow Amausi), can usually be booked for $909.