I'll be travelling from New Delhi to Warsaw in the end of September. Since there is no direct flight for this particular route, I'm not sure what would be best.
The cheapest (and my preferred option) is Air India to Frankfurt (FRA) in a 787 (which is why it's preferred), followed by Lufthansa/LOT Polish to Warsaw. Although, the connecting time is a measly 1h10m, which is probably way too low (more so since this my first time flying international).
Another option is going to Paris and then to Warsaw from there, but Air France is the only one who goes direct from Paris to Warsaw. Also, since the tickets will have to be booked separately, it's a hassle, and it's considerably costlier.
Edit: In light of WANTA, I'd like to be more general about the question. How much is safe for connecting time, if I were to go through Frankfurt (with the connecting flight being a separate airline).