Loungebuddy is offering a free airport lounge pass up to a $40 value when you pay with your Visa Card and purchase at loungebuddy.com/visa.

This promotion is available at over 130 Locations Worldwide. You can check the list here.

When I tested London Heathrow, it gave me 5 results including these three.

There are some terms and conditions to be aware of.

Offer valid only when book at LoungeBuddy.com via the specified promotional link and pay with a valid Visa card.
Not valid through LoungeBuddy app.
Offer subject to change, and is subject to LoungeBuddy’s terms and conditions, and privacy policy.
Amenities vary by location – see specific lounge listings for details.
Void where prohibited or restricted by law.
Any taxes are the sole responsibility of the purchaser.
Strict limit of one offer redemption per customer. Multiple redemptions by the same customer will result in all offers being void.
Offer may not be combined with any other coupon, offer, or promo.
Not redeemable for cash.
If cost of lounge access is less than $40 USD, remaining discount amount is forfeited.
Void if altered, copied, transferred, sold, purchased or where prohibited, taxed or restricted by law.
Returns and exchanges are subject to LoungeBuddy’s return policy.
Valid for online purchases via the Visa Promotional Link at LoungeBuddy.com/visa.
The above offer is available from 08/01/2016 to 10/31/2016 (or while supplies last).

I’ve never used their service before but a free lounge pass will certainly help me try it on an upcoming trip.