Kayak

KAYAK is a free travel metasearch engine that searches hundreds of travel sites at once so travelers can compare and find the lowest available prices on flights, hotels, rental cars, and vacation packages, with an extensive filtering system for narrowing results. Founded in 2004 and part of Booking Holdings, KAYAK operates a family of global travel brands (including momondo, Cheapflights, HotelsCombined, SWOODOO, checkfelix and Mundi) across 60+ international sites in 25+ languages. Beyond consumer metasearch it offers KAYAK for Business, a Flight Tracker, an Explore destination-discovery tool, and KAYAK AI trip-planning. KAYAK is a metasearch and price-comparison engine rather than an online travel agency — bookings are completed with the airline, hotel, car-rental company, or travel agency. This profile documents KAYAK's public discovery, AI, and security surface; KAYAK does not currently operate a public self-serve developer API program.

Kayak is profiled on the APIs.io network. Tagged areas include Company, Travel, Metasearch, Flights, and Hotels.

Kayak’s developer surface includes support, engineering blog, signup flow, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

17.3/100 emerging ▬ flat Agent 7/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyTravelMetasearchFlightsHotelsCar RentalTravel SearchPrice ComparisonBooking HoldingsAI

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 17.3/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 1.3 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 1.4 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 7/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 3 / 3

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/kayak: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 6

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

TrustCenter

TrustCenter

Compliance

Compliance

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

About

About

Blog

Blog

Source (apis.yml)

aid: kayak
name: Kayak
description: KAYAK is a free travel metasearch engine that searches hundreds of travel sites at once so travelers can compare
  and find the lowest available prices on flights, hotels, rental cars, and vacation packages, with an extensive filtering
  system for narrowing results. Founded in 2004 and part of Booking Holdings, KAYAK operates a family of global travel brands
  (including momondo, Cheapflights, HotelsCombined, SWOODOO, checkfelix and Mundi) across 60+ international sites in 25+ languages.
  Beyond consumer metasearch it offers KAYAK for Business, a Flight Tracker, an Explore destination-discovery tool, and KAYAK
  AI trip-planning. KAYAK is a metasearch and price-comparison engine rather than an online travel agency — bookings are completed
  with the airline, hotel, car-rental company, or travel agency. This profile documents KAYAK's public discovery, AI, and
  security surface; KAYAK does not currently operate a public self-serve developer API program.
url: https://raw.githubusercontent.com/api-evangelist/kayak/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://content.r9cdn.net/rimg/provider-logos/common/socialmedia/kayak-logo.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- general-catalyst
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Travel
- Metasearch
- Flights
- Hotels
- Car Rental
- Travel Search
- Price Comparison
- Booking Holdings
- AI
apis: []
common:
- type: Website
  url: https://www.kayak.com/
- type: About
  url: https://www.kayak.com/about
- type: Support
  url: https://www.kayak.com/c/help/
- type: Blog
  url: https://www.kayak.com/news/
- type: PrivacyPolicy
  url: https://www.kayak.com/privacy
- type: SignUp
  url: https://www.kayak.com/login
- type: Security
  url: https://www.kayak.com/c/security/
- type: SecurityTxt
  url: well-known/kayak-security.txt
- type: WellKnown
  url: well-known/kayak-well-known.yml
- type: LLMsTxt
  url: llms/kayak-llms.txt
- type: VulnerabilityDisclosure
  url: security/kayak-vulnerability-disclosure.yml
- type: TrustCenter
  url: security/kayak-trust-center.yml
- type: Compliance
  url: https://www.kayak.com/c/security/
- type: Conformance
  url: conformance/kayak-conformance.yml
- type: DomainSecurity
  url: security/kayak-domain-security.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Kayak

Kin Score

Security Posture 3

Kayak Domain Security

Kayak Vulnerability Disclosure

Kayak Trust Center

Resources