Domain Registrar Dashboard
This is the first and the easiest method which you can use to check the domain’s expiry. But this step for those people who want to check expiray date of they own domains. If you wanted to check different domains expiry dates, then skip this step.
So, for checking the expiry date of your own domain. You just have to head over to your domain registrar website. There are several domain registrars available over the Internet. I personally use Godaddy from where I have bought all of my domains. You have to check for yours and proceed.

When you reach your domain registrar website, just log in to your account from there. If you are using GoDaddy, then you will see a tab at the top called My Products. Just click on it, and then you will see the domains that you own on a new page. After this, Just choose the domain which you want to check. Click on manage, and you will able to see the expiry date of the domain.

The process of checking a domain and the layout may be different according to your domain registrar. These steps are for GoDaddy. But the functions are all the same.
Domain Expiration Checker
Step 1) Open your preferred browser and visit the Expiration checker (link down below), and click on the Check domain option, or you can just click on the header above to visit the Domain Checker directly.
Step 2) Type the domain name in the box and click on the Check button, the service will check for the public domain data and show you everything including the expiry date.
Domain Expiration Checker
Using this site you won’t get too many details of the domain, but you get the Expiry date easily.
WHOIS is a fantastic Domain checker tool, it gives you almost all the details of the domain that is allowed for the public to see. The site is free there is no hassle of login or anything.
WHOIS Lookup Tool
Step 1) Just visit the WHOIS site by click on the heading, and type the domain name in the search box
Step 2) Click on the Whois Lookup button, and the website will present you with the full possible details of the domain name which also includes the expiry date.
Who.is Database
This is similar to the above one, or you can say one of its subsidiaries. But there is a little bit of difference in terms of the features that both of these websites provide, on the Whois.net when you will put the domain name. You will just get some of the information regarding the domain, and some of the domain extensions don’t even work there.

While using the Who.is, you can see the creation date of the domain and the date on which it will be going to expire. If it is not your domain and you want to make a deal for it, then Who.is also gives the link to get the contact information of the owner of the domain. You can also get information regarding the DNS of the domain which is searching for.
Conclusion
So, these are the different methods or websites by which you can see the expiration date of any domain. And make sure to renew your domain purchases to avoid losing them or paying hefty late renewal charges.