The direct flights are all banned until June 21st so only the wealthy are able to transfer through the US if they're desperate.
Hope it costs them a bundle and not bring the covid variant with them.
My understanding for both Pakistan and India is that since there are no direct flights to Canada, and that since Canada requires travellers from either country to have a covid test
in whatever (third) country the travellers fly from to Canada:
-any traveller would need to get a covid test in a transit country;
-which means either getting the covid test within the transit zone of the airport of that country,
or,
-being able to enter the transit country to have the covid test (i.e. having a visa or the right to enter that country and staying long enough to have the test and get the results).
For those who can get to the USA and can enter by car, whatever restrictions at Canadian land border apply.
As far as I'm aware:
-don't know of any countries that currently provide the covid test facilities within the transit zone;
-many countries (eg USA) also have serious flight restrictions from India and Pakistan (with small differences from country to country);
-obviously many India/Pakistan citizens do not have visas to enter those 'transit countries' and so effectively cannot travel on to Canada;
-I do not know but I am guessing that very few countries right now would allow India/Pakistan citizens to enter (possibly even with a visa) just for the purposes of getting a covid test (i.e. they might allow to enter for permanent residence or other purposes but just for transit, they may be restricting and/or not issuing new visas);
-if those transit countries also have quarantine rules for those entering the country (not just transitting through airport), presumably quarantine rules would apply as well.
And obviously for many travellers, the severe inconvenience and uncertainty and additional costs may just be impractical.
I'm not aware of any 'route' to Canada that's proved reliable for large numbers of Pakistani/Indian travellers.
There are lots of people searching and while there are always some so-called 'loopholes', it seems so far that where there are gaps, they're rather minimal and/or limited just to travellers who already have visas/passports that allow them to stop, travel through and get tested in 'transit countries.'