Google Flights MCP Server

google-flights-mcp

The most feature-rich MCP server for Google Flights. No API key required.

12 tools for searching flights, tracking prices, comparing cabins, analyzing layovers, and more, all powered by real-time Google Flights data.

Works with Claude Desktop, Claude Code, Cursor, and any MCP-compatible client.

Features no other Google Flights MCP has

• Carbon emissions per flight and per leg (CO2 in kg)
• Price context: Google's own assessment of whether a price is low, typical, or high
• Price tracking: track prices over time with SQLite persistence, detect drops and trends
• Calendar heatmap: 60 days of daily prices in a single API call
• Cabin class comparison: economy vs premium vs business vs first, side by side
• Nearby airport suggestions: find cheaper alternatives (e.g., EWR/LGA near JFK)
• Layover analysis: connection time risk assessment (tight/comfortable/overnight)
• Aircraft & seat details: Boeing 787 vs 777, seat pitch in inches
• Google Flights URLs: direct booking links users can click

What you can ask

• "Find nonstop flights from JFK to London next month"
• "What's the cheapest week to fly SFO to Tokyo?"
• "Compare economy vs business class for LAX to Paris"
• "Are there cheaper airports near JFK I should check?"
• "Track the price of SFO to NRT on June 15 and alert me if it drops"
• "Show me the emissions for flights from SFO to Tokyo"
• "Analyze the layovers for connecting flights from SFO to Bangkok"

Quick start

Option 1: npx (no install)

Works immediately with Claude Code:

claude mcp add google-flights -- npx -y google-flights-mcp

Or with Claude Desktop, add to your claude_desktop_config.json:

{
  "mcpServers": {
    "google-flights": {
      "command": "npx",
      "args": ["-y", "google-flights-mcp"]
    }
  }
}

Option 2: Install from source

git clone https://github.com/andreacappelletti97/google-flights-mcp.git
cd google-flights-mcp
npm install
npm run build

Then connect to Claude Code:

claude mcp add google-flights node /absolute/path/to/google-flights-mcp/dist/index.js

Or Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "google-flights": {
      "command": "node",
      "args": ["/absolute/path/to/google-flights-mcp/dist/index.js"]
    }
  }
}

Restart your MCP client. You should see 12 flight tools available.

Tools (12)

Search

Price intelligence

Airport tools

Utility

Example output

search_flights (with emissions and price context)

Flights from SFO to NRT on 2026-06-15:
Price assessment: HIGH ($294 above typical). Range: $500 - $700, typical: $577

Flight 1: $874 | 11h 15m | 0 stop(s) | CO2: 428kg
  ZG 25: SFO -> NRT (11h 15m) [aircraft: Boeing 787, seat pitch: 31 inches, CO2: 428kg]

Flight 2: $1310 | 11h 5m | 0 stop(s) | CO2: 545kg
  NH 7: SFO -> NRT (11h 5m) [aircraft: Boeing 777, seat pitch: 34 inches, CO2: 545kg]

get_calendar_heatmap

Price calendar: SFO -> NRT
61 days of data

Cheapest: $384 (2026-02-12)
Most expensive: $870 (2026-04-13)
Average: $632

  2026-02:
    12: $384     ***
    13: $384     ***
    ...
    20: $540     ***
  2026-03:
    06: $609      *
    ...
    20: $689

find_nearby_airports

Airports near JFK within 150km:

  LGA - LaGuardia Airport (New York, US), 17km away
  EWR - Newark Liberty International Airport (Newark, US), 33km away
  HPN - Westchester County Airport (White Plains, US), 48km away

How it works

There is no official Google Flights API. This server reverse-engineers Google's internal FlightsFrontendService endpoint. It extracts not just flights, but hidden metadata: emissions, price assessments, daily price calendars, aircraft types, and seat details.

Reliability

• Caching: 5-minute TTL cache, identical searches don't hit Google twice
• Retry with backoff: exponential backoff + jitter on 429/5xx errors, honors Retry-After headers
• Circuit breaker: stops requests after 5 consecutive failures, auto-recovers after 30s
• Structural validation: clear errors when Google changes their response format
• TLS mitigation: undici with browser-like headers + rotating User-Agents, fetch fallback

Price tracking

Price history is stored in SQLite at ~/.google-flights-mcp/prices.db. Each call to track_price records the current cheapest price and reports the trend compared to previous observations.

Development

npm install         # Install dependencies
npm run build       # Build with tsup
npm test            # Run tests (85 tests)
npm run lint        # ESLint with FP rules (no-let, immutable-data, no-loop-statements)
npm run typecheck   # TypeScript strict type checking
npm run check       # typecheck + lint + test (the full CI pipeline)
npm run dev         # Build in watch mode

Design

Fully functional TypeScript codebase:

• No mutation: all types readonly, no let/var/.push()/for loops
• Result monad: errors are values (Result<T, E>), not exceptions
• Pure/IO separation: pure transforms are separate from network and disk IO
• Composition: pipe() + flatMap() for chaining fallible operations

See CLAUDE.md for architecture details and the Google Flights response format reference.

Limitations

• No official API: uses an undocumented Google endpoint that could change at any time. Structural validation makes breakages obvious.
• Rate limiting: Google may throttle heavy use. Built-in retry and circuit breaker handle transient issues.
• Prices are estimates: prices reflect query time; they can change before booking.
• Currency: determined by Google based on IP/locale.

Contributing

1. Fork the repo
2. Create a feature branch
3. Make your changes
4. Run npm run check to verify
5. Open a PR

License

ISC