Here we have the next Mumbai fare: Emirates Airlines is offering return flights from Amsterdam to Mumbai (India) for only €450 - round trip incl. taxes.
450 Euro is really cheap for a Emirates flight during the high season. All flights have a short stopover in Dubai, but you can also add a longer stopover / layover for free.
Emirates Airlines is one of the best airlines in the world (Skytrax 4/5). The Economy Class of Emirates offers a 79 - 81 cm / 31 - 32 inch seat pitch and a personal in-flight entertainment system and in-seat laptop power-outlets on newer aircraft or recharging facilities in galleys in older aircraft.
The fare is valid for travel commencing after 18th January 2013 and before 10th June 2013. The sale ends on 10th January 2013.
If you're also searching for a affortable accomondation in Mumbai, you should check the current Hotels.com 10% voucher & Expedia 10% voucher, but you should always compare hotel rates on HotelsCombined.com.
If you speak German, I'd recommend to book your flights on Opodo.de, because they offer the flights for €450 (+€9.20 VISA/Mastercard fees) otherwise please visit Emirates.com for flight booking enquiries.