MMT Wednesday Offer On Flights- Upto 15% OFF on Domestic Flights with Union Bank of India Credit & Debit Cards. The customer will get Instant Discount on domestic flight bookings as per the table above for the amount paid through Union Bank of India Credit and Debit Cards. Offer is valid for bookings done on every Wednesday till 28th June 2022. The offer is valid on 1 booking per card per month using the above offer code. Limited Time Period. Book Now