flights-mcp

An MCP server for searching flights using Google Flights data via SerpAPI.

Built with FastMCP for use with Claude Code, Claude Desktop, or any MCP-compatible client.

Why

Most flight MCP servers have incomplete airline coverage — missing low-cost carriers like Ryanair, easyJet, or Wizz Air. This server uses Google Flights (via SerpAPI) which aggregates all airlines, giving you the same results you'd see in the browser.

Features

• Search one-way and round-trip flights with full Google Flights data
• Filter by stops, cabin class, price, and sort order
• Get booking links from airlines and travel agencies
• Price insights (price level, typical range, price history)
• All airlines included (Ryanair, easyJet, Iberia, Lufthansa, etc.)

Tools

mcp_search_flights

Search for flights on a specific route and date.

Parameter	Type	Default	Description
departure	str	required	Departure airport IATA code (e.g. MAD)
arrival	str	required	Arrival airport IATA code (e.g. BER)
date	str	required	Departure date YYYY-MM-DD
return_date	str	None	Return date for round trips
passengers	int	1	Number of adult passengers
stops	int	None	1=nonstop, 2=1 stop max, 3=2 stops max
travel_class	int	1	1=economy, 2=premium, 3=business, 4=first
sort_by	int	1	1=top, 2=price, 3=departure, 4=arrival, 5=duration
currency	str	EUR	ISO currency code
max_price	int	None	Maximum price filter

mcp_get_booking_options

Get booking links for a specific flight using its booking_token from search results.

Parameter	Type	Default	Description
booking_token	str	required	Token from a flight search result
currency	str	EUR	ISO currency code

Setup

1. Get a SerpAPI key

Sign up at serpapi.com and grab your API key. Free tier includes 100 searches/month.

2. Add to Claude Code

claude mcp add flights \
  -e SERPAPI_API_KEY=your_key_here \
  -- uv --directory /path/to/flights-mcp run flights-mcp

Or add manually to ~/.claude.json:

{
  "mcpServers": {
    "flights": {
      "type": "stdio",
      "command": "uv",
      "args": ["--directory", "/path/to/flights-mcp", "run", "flights-mcp"],
      "env": {
        "SERPAPI_API_KEY": "your_key_here"
      }
    }
  }
}

3. Restart Claude Code

The server will be available after restart. Try: "Search for direct flights from Madrid to Berlin on March 19".

Development

git clone https://github.com/chaosisnotrandomitisrhythmic/flights-mcp.git
cd flights-mcp
uv sync
SERPAPI_API_KEY=your_key uv run flights-mcp

Architecture

src/flights_mcp/
├── __init__.py    # Exports mcp instance and run_server
├── server.py      # FastMCP server setup and tool definitions
└── tools.py       # Pure business logic (no MCP awareness)

• tools.py — Pure Python functions that call SerpAPI and return dicts. No MCP dependency. Easy to test independently.
• server.py — Thin @mcp.tool() wrappers that serialize results to JSON. Defines the MCP interface.

License

MIT