Glossary

Look‑to‑book

The ratio of searches (looks) to bookings. It is a measure of search efficiency and conversion and drives cost and capacity planning.

While useful, look‑to‑book should be read with context: vertical mix, shopping patterns and caching all influence it. Optimisation focuses on deduplication, routing and UI clarity rather than chasing one number.

See also the unified travel API. For what to ask a vendor about caching, routing and retries, read look-to-book ratio and caching.

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02 Nov 2026

Look-to-book ratio and caching: what CTOs should demand from a travel API

Every search you send to a supplier is a "look". Only some of them become bookings. The ratio between the two, your look-to-book ratio, quietly decides how much a travel API costs you, how fast it feels and whether suppliers are happy to keep you connected.

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