Assuming you would like detailed instructions on how to check a Biman flight:
1. Go to www.biman-airlines.com
2. Scroll down to the bottom of the homepage and click on the orange Check Flight button under the Plan Your Trip heading
3. On the next page, select whether you would like to check by flight number or city pair and enter the required information
4. Click on the blue Check Flight button and your results should populate below
5. If your desired flight is not listed, it may be because Biman has not yet released timetables for flights beyond six months from today's date