LetsFG — Your AI agent just learned to book flights. (Node.js)

Server-side search engine. Real prices. One function call. Search hundreds of airlines at raw airline prices — $20–$50 cheaper than Booking.com, Kayak, and other OTAs. Zero dependencies. Built for AI agents.

Two ways to use LetsFG

| | CLI / SDK (this package) | Developer API | |---|---|---| | Search cost | Free (Twitter/X Bearer token via letsfg auth) | Prepaid credits | | Booking URL | 1% concierge fee (min $3) via letsfg.co | Direct airline URL, no fee | | Speed | 60–90 s | 2–5 s (discover) · 60–90 s (full) | | Setup | npm install letsfg then letsfg auth | letsfg.co/developers |

Want direct airline URLs without any per-booking fee? Use the Developer API — prepaid credits, results in seconds, no checkout step.

Install

npm install letsfg

Quick Start (SDK)

import { LetsFG, cheapestOffer, offerSummary } from 'letsfg';

// Register (one-time)
const creds = await LetsFG.register('my-agent', '[email protected]');
console.log(creds.api_key); // Save this

// Use
const bt = new LetsFG({ apiKey: 'trav_...' });

// Search — FREE
const flights = await bt.search('GDN', 'BER', '2026-03-03');
const best = cheapestOffer(flights);
console.log(offerSummary(best));

// Unlock
const unlock = await bt.unlock(best.id);

// Book
const booking = await bt.book(
  best.id,
  [{
    id: flights.passenger_ids[0],
    given_name: 'John',
    family_name: 'Doe',
    born_on: '1990-01-15',
    gender: 'm',
    title: 'mr',
    email: '[email protected]',
  }],
  '[email protected]'
);
console.log(`PNR: ${booking.booking_reference}`);

Quick Start (CLI)

export LETSFG_BEARER_TOKEN=<your-bearer-token>

letsfg search GDN BER 2026-03-03 --sort price
letsfg search LON BCN 2026-04-01 --json  # Machine-readable
letsfg unlock off_xxx
letsfg book off_xxx -p '{"id":"pas_xxx","given_name":"John",...}' -e [email protected]

API

new LetsFG({ apiKey, baseUrl?, timeout? })

bt.search(origin, destination, dateFrom, options?)

bt.resolveLocation(query)

bt.unlock(offerId)

bt.book(offerId, passengers, contactEmail, contactPhone?)

bt.setupPayment(token?)

bt.me()

LetsFG.register(agentName, email, baseUrl?, ownerName?, description?)

Helpers

• offerSummary(offer) — One-line string summary
• cheapestOffer(result) — Get cheapest offer from search

Zero Dependencies

Uses native fetch (Node 18+). No axios, no node-fetch, nothing. Safe for sandboxed environments.

Also Available As

• MCP Server: npx letsfg-mcp — npm
• Python SDK + CLI: pip install letsfg — PyPI
• Try without installing: letsfg.co — search instantly in your browser
• GitHub: LetsFG/LetsFG

⭐ Star the repo — we appreciate the support.

License

MIT