Well, there is no saffron substitute as such for the high-quality saffron threads are pretty much irreplaceable.

But here's a catch, if you're in a need to add just a bit of saffron color, then these can do the trick.

Cardamom can easily give the same aroma as a saffron would

Turmeric is the most widely recommended saffron substitute

Safflower has a similar ability to color food along with a pleasant, distinctive flavor as saffron

Sweet Paprika is another inexpensive substitute for saffron