How To Monetize India Leads?

Leads for what?

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You can try to monetize them with CPA offers which accept traffic from India.

Adsense: Simplest and quickest. Can give you easy money.
Affiliate network: Show ads from companies which do fulfillment (e.g. Expedia). They can pay you commission per booking done by your visitors. Best bet is to become affiliate of the bigger brand since your users are more likely to have more overlap with them. Most of the big travel companies have affiliate programs (via widgets, white label solution, API) that you should be able to integrate easily. You can also approach an performance based Ad network which might be serving ads from multiple such companies. In India, two such performance based networks are DGM and Shoogloo.
Lead generation: You can generate leads for some travel related businesses (hotels, tour package operators) and charge per lead.
Direct advertisement: You can seek out ads from bigger companies directly. You'll need to maintain a sales team (or do it yourself). However, most companies typically don't deal with websites having small no. of impressions (< few millions). So, you might find it incredibly hard to do this.
In-text ads: For content sites, in-text ads also make sense. You might have seen them on some sites - links are with double underline, when you hover over them a small popup with the ad shows up. Most users frown upon such ads as it makes the text hard to read and as such aren't recommended.