Open the Airtel Thanks app
Log in with your Airtel mobile number
Go to the prepaid account or plan details section
Check the active plan validity date there
Visit the Airtel website
Sign in with your Airtel number
Open the account or recharge details page
View the current plan validity shown on the page
Use Airtel USSD code by dialing *121# from your Airtel number
Follow the on-screen menu to check validity
Send an SMS or use Airtel customer support chat if online options are unavailable