The Indian Railway Catering and Tourism Corporation has some great tour deals this season.  Their latest offers include 5N/6D deals to Nepal and Bhutan including return airfare. 

The Nepal Tour Package includes return economy class airfare from Delhi on Indigo Airlines; 5 nights accommodation at 3-star hotels in Nepal; daily breakfast and dinner at the hotel; sightseeing in AC coaches; an English-speaking tour guide; entrance fees at monuments for single entry and travel insurance for passengers below 70. 
Price: ₹31,500 per person on double sharing basis, inclusive of all taxes

The Bhutan Tour Package includes: Return economy class airfare from Delhi on Druk / Bhutan Air; 5 nights accommodation at 3-star hotels in Bhutan;  daily breakfast and dinner and one lunch at the hotel; all sightseeing and transfers as per itinerary in an SUV; an English speaking tour guide; entrance fees to monuments for single entry and travel insurance for passengers below 70.
Price: ₹42,000 per person on double sharing basis