flights-mcp

A Python MCP server that searches for flight offers (one-way, round-trip, multi-city) and retrieves offer details using the Duffel flight search API. It exposes MCP tools like search_flights and get_offer_details and requires a Duffel API key provided via environment variable.

Evaluated Mar 30, 2026 (22d ago)

Repo ↗ Ai Ml mcp flights travel duffel api-integration python

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Uses Duffel API keys passed via environment variable per README. README claims sensitive info stays local, and that the server is read-only (no booking). Specific TLS enforcement, secret redaction/logging, and dependency vulnerability posture are not detailed. Rate limit and quota guidance is not provided with actionable headers/limits.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

You want an AI agent to perform structured flight searches and then follow up with detailed offer lookups via MCP tool calls.

Avoid When

You need broad public automation without running a local MCP server process (e.g., fully managed hosted API access), or you cannot provide/manage Duffel API credentials.

Use Cases

• Finding flight options for one-way trips with constraints (dates, cabin class, adults)
• Searching and comparing round-trip itineraries
• Building and searching multi-city itineraries with multiple segments
• Getting detailed pricing and route/slice/connection information for a specific offer ID
• Searching across multiple days to find cheaper departures/returns (at reduced speed)

Not For

• Booking flights or initiating any purchase
• Real-time itinerary changes requiring write operations (tool is read-only)
• Use cases that require an official REST/GraphQL/SDK integration instead of MCP

Interface

REST API

GraphQL

gRPC

MCP Server

Yes

SDK

Webhooks

Authentication

Methods: Duffel API key via environment variable (DUFFEL_API_KEY_LIVE)

OAuth: No Scopes: No

Auth is handled by Duffel API key. README indicates a test key (duffel_test) can be used for simulated data; live key requires Duffel verification steps.

Pricing

Free tier: No

Requires CC: No

No pricing details for this MCP server are provided; cost depends on Duffel plan/usage limits mentioned generally in README.

Agent Metadata

Pagination

none

Idempotent

True

Retry Guidance

Not documented

Known Gotchas

⚠ Requires local configuration to run the MCP server process (Claude Desktop config shown); not a hosted endpoint.
⚠ Real flight lookups require a Duffel live key; missing/invalid key behavior is only described generally.
⚠ Search results are capped (e.g., up to 50 offers for one-way/round-trip, 10 for multi-city); the agent may need follow-up get_offer_details for specific IDs.
⚠ Supplier/network timeouts are 15-30 seconds depending on search type; agents may need to handle slower responses.

Alternatives

Use Duffel API directly from your own backend Use an existing flight-search API/SDK that provides REST endpoints and client libraries Manually search on airline/aggregator sites for simple itineraries

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Scores are editorial opinions as of 2026-03-30.