A free European flight is on offer to any new Post Office customers who take out a credit card with them in March.
Free return flights will be provided to Dublin, Amsterdam, Brussels, Berlin, Paris or Madrid for new customers accepted for a Post Office Credit Card by March 27.
To qualify, people must enter the code FLIGHT when filling in the online application form for the card. They have to pay any taxes and additional charges imposed by the airline, flight vouchers are valid for 90 days after they are issued, and flights cannot be taken during any weeks that contain a public holiday.
The group launched the offer to flag up the benefits that its credit card has for travellers, including the fact that it does not levy charges for purchases made overseas.
Az Alibhai, head of credit cards at the Post Office, said: "This is a great opportunity for customers to get a credit card offering great rates and value for travellers and at the same time take advantage of a return flight to Europe."
The card also offers 0% interest on balance transfers for the first 12 months, and while this lags behind the market leaders, with Nationwide currently offering 0% for 17 months, customers will also be offered an interest-free period on transfers for five months during the second and third years after the card is taken out.
Purchases are interest-free for the first three months, and there is no cash advance fee when the card is used to purchase travel money from the Post Office.