How to calculate true CAC for a travel business

Most travel businesses calculate customer acquisition cost by dividing last month's ad spend by last month's bookings. The number this produces is wrong in at least three directions simultaneously, and it is usually wrong in a comforting way.

Getting it right is not complicated, but it requires deciding a few things explicitly.

Decision 1 — What goes into the numerator

CAC should include the full cost of acquiring a customer, not just the media cost:

• Paid media spend across all platforms
• Agency or freelancer fees
• Tooling — CRM, landing page platform, call tracking, WhatsApp API costs
• Creative production attributable to acquisition
• A fair share of in-house salary for people doing marketing and pre-sales

The sales-team question is where businesses differ. If your consultants spend most of their time converting new enquiries, a share of their cost is acquisition cost. If they are primarily servicing existing relationships, it is not. Pick a treatment, write it down, and apply it consistently — the trend matters more than the absolute number.

Decision 2 — What counts as an acquisition

Three candidates, each measuring something different:

• Per booking — one family of six booking together is one acquisition. Best for understanding funnel economics.
• Per traveller — that same family is six. Useful for capacity planning on fixed-departure group products.
• Per new customer — excludes repeat travellers. The most honest measure of acquisition efficiency.

Use per-booking as your primary measure and track per-new-customer alongside it. If they diverge over time, your repeat business is either growing or quietly disappearing, and either is important to know.

Decision 3 — How to handle the time lag

This is what breaks the naive calculation. Spend in April produces enquiries in April, some of which become bookings in June, for travel in December. Dividing April spend by April bookings compares two unrelated populations.

The fix is cohort-based: group leads by the month they were acquired, then track bookings from that cohort as they mature.

These figures are illustrative — the shape is the point. Once you know your own maturation curve, you can estimate a cohort's final CAC from its 30-day position with reasonable confidence, which is what lets you make budget decisions without waiting a quarter.

Compare CAC to margin, not to trip value

This is the error that does the most damage in travel. A ₹2,00,000 package where you keep ₹20,000 is a ₹20,000 business, not a ₹2,00,000 one. A CAC of ₹15,000 against that booking leaves ₹5,000 — before any of your fixed costs.

Always evaluate CAC against gross margin per booking. In travel that means net of supplier costs: flights, hotels, transport, guides, permits, visa fees and applicable taxes. Many travel businesses discover at this point that their most impressive-looking package is their least profitable to acquire.

Segment before you conclude

Blended CAC hides everything that matters. The same business will typically show wildly different economics across:

• Destination — a domestic weekend trip and a two-week Europe tour are different businesses
• Channel — brand search CAC is not comparable to cold prospecting CAC
• Season — peak-season auction costs can be multiples of shoulder season
• New versus repeat — repeat bookings often have near-zero acquisition cost

Segment by destination and channel at minimum. The interesting finding is almost always inside a segment, and almost never in the blended average.

Account for repeat and referral

A traveller who books a domestic trip this year and an international one next year, and refers a colleague in between, has an acquisition cost that should be amortised across all of that. If your CAC calculation only ever looks at the first booking, you will systematically under-invest in acquisition.

Track a simple three-year value per acquired customer if you have the history. Even a rough figure changes what CAC you can justify — often substantially.

The monthly view worth building

One table, updated monthly, by destination and channel: total acquisition cost, enquiries, qualified enquiries, bookings, booked revenue, gross margin, CAC per booking, and margin-to-CAC ratio — with cohorts tracked by lead month rather than booking month.

It is more work than a dashboard screenshot, and it is the difference between allocating budget on evidence and allocating it on the most recent conversation. In a business where the gap between spend and revenue is measured in months, that difference compounds quickly.