If you are building an AI agent that needs to search or book travel, there is no single API that does everything, but there is a clear winner for each job. For flights with real booking, Duffel is the fastest working path because it handles merchant of record and accreditation. For hotels, LiteAPI is built specifically for agents. For search-only tools, Amadeus Self-Service and a growing set of official MCP servers are free to start. The big consumer brands (Booking.com, Kayak, Google Flights) offer no open agent access at all.
Last verified 21 July 2026.
This page compares every travel API and MCP server an agent builder can realistically use, on the axes that matter for agents: can you get access without an enterprise contract, can the agent actually book, is the API deterministic enough to trust, and who carries the regulatory weight. It is compiled from vendor documentation and dated industry coverage. Where we have not yet run an integration ourselves, we say so rather than score it.
The comparison
| Provider | What it covers | Booking? | Open access? | MCP status |
|---|---|---|---|---|
| Duffel | Flights (300+ airlines), hotels (Stays), seats, bags | Yes, full order creation | Yes, self-serve signup, test mode | No official MCP; REST wraps cleanly, third-party connectors exist |
| LiteAPI (Nuitee) | Hotels (3M+ properties), flights growing | Yes | Yes, self-serve, positioned for agents | MCP-native by design |
| Amadeus Self-Service | Flight search, hotel search, many data APIs | Search yes; booking needs enterprise step-up | Yes, free test tier | Community MCP server, search only |
| Sabre | Full GDS: 420+ airlines, 2M hotels | Yes, via partnership | No, contract required | Official MCP layer over its APIs |
| Travelport | Full GDS, servicing (exchanges, reissues) | Yes, via partnership | No, agency relationship required | TripServices delivered over MCP to 400+ European agencies (July 1, 2026) |
| Expedia B2B | Expedia inventory | Yes, partner-gated | No, contract; MCP server GA expected Q3/Q4 2026 | Public MCP is recommendations-only today |
| Kiwi.com Tequila | Flights incl. virtual interlining | Yes, for existing partners | Effectively closed to new small partners | Search MCP exists |
| Turkish Airlines | One airline: search, status, booking links | Links out, not autonomous booking | Yes | Official airline MCP server, the first of its kind |
| VariFlight | Flight status and aviation data | No, data only | Yes, free tier | Official MCP server |
| Booking.com / Kayak / Google Flights | Consumer search and booking | First-party apps only | No open agent access | None official |
How to choose
Three questions settle it.
Does your agent need to complete a booking, or just search? If search is enough, start free: Amadeus Self-Service for flights and hotels data, VariFlight for status, and the official MCP servers listed above. If the agent must book, you need a supplier that sells to you: Duffel for flights, LiteAPI or a wholesale hotel platform for rooms.
Who carries the regulatory and payment weight? Selling flights normally requires IATA or ARC accreditation. Duffel’s Managed Content program removes that requirement by selling under its own accreditation, with Duffel as merchant of record, in five points of sale including the US and UK (Duffel help docs). That single fact is why most small agent projects that book real flights run on Duffel. Hotels are lighter: suppliers sell on their own agreements.
Do you need determinism? An agent that books must get the same answer to the same request, structured errors, and honest offer expiry. This is the architecture argument Travelport made in July 2026 when it put 400+ European agencies on deterministic booking APIs behind MCP: language models cannot reliably confirm a ticket, so the API underneath must. When you evaluate any provider, test three things in their sandbox: repeat the same search twice and diff the results, book with an expired offer and read the error, and send the same order request twice with one idempotency key.
What the big platforms are doing instead
The consumer giants are building first-party agents, not open ones. Priceline’s Penny handles end-to-end booking inside Priceline. Booking.com’s AI Trip Planner books inside Booking.com. Expedia’s agentic tooling is for its contracted B2B partners, announced May 2026 with GA expected later this year. OpenAI walked back in-chat travel checkout in March 2026, and its travel apps (Expedia, Booking.com, Skyscanner) search and then redirect. The pattern is consistent: assistants are becoming great at travel discovery, while open programmatic booking access remains the gap. That gap is exactly what the supplier APIs above fill.
Warnings
Two things on this list deserve explicit caution. First, unofficial MCP servers that automate airline and hotel websites (community “Delta MCP” or “Marriott MCP” repositories) are not sanctioned by those companies, generally violate terms of service, and break without notice. Use official APIs only; a booking is not something to build on a scraper. Second, beware content about this topic that carries no dates. Assistant capabilities and API programs changed materially in every quarter of the past year, and undated claims about what an AI can book are usually wrong by the time you read them.
What is still missing from the market
Nobody yet offers an open, self-serve API where any authenticated agent can search, book, and pay across flights and hotels with deterministic policies and honest all-in pricing. The supply exists (the table above proves it), the payment rails went live for travel in Europe this month, and the demand is starting. Levelfare is building toward exactly that contract, stated publicly on the agents page before the API ships so you can hold us to it.