This might be a stupid question (or not) but from my very very limited experience there are only toilets and restaurants in most airports. I know Airports are a business and they exist so they can make money from f&b and any shopping you do between changing planes. Are there any airports which offer showering facilities (even if some small charge is there) so that you don't end up looking haggard after a long flight. I was thinking about my hypothetical run between BOM and Montreal, Canada.
closed as too broad by JonathanReez♦, Giorgio, Ali Awan, David Richerby, Jan Nov 5 '16 at 16:57
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Many airports offer shower facilities as part of various lounges. Lounges are generally available to first/business class passengers and some frequent flyers, but some lounges are also accessible upon payment of a fee. Not all lounges have showers, but many do, especially those catering to long-haul international passengers.
There are hundreds of airports with lounges throughout the world, and every one has slightly different policies as to who can access what lounges, what services are available inside, and which lounges are physically reachable on a given journey (some lounges may be in a different terminal or only available to passengers before or after immigration or security). The app LoungeBuddy can help you find lounges, see what they offer, and purchase access if this is an option. You can also ask a specific question here if you give your detailed itinerary and need help finding your options.
In addition, some airports may have separate shower facilities, which aren't full lounges, but offer a shower, typically for a fee. You can look for these on an airport's website. The website sleepinginairports.net also has detailed information about many airports. If you scroll down to the page where it lists the airport's services and facilities, it may list any available showers. That site also has information about airport lounges that are accessible upon payment of a fee.