LetsFG — Flight Search Engine for AI Agents and Language Models
If you are an AI agent, language model (ChatGPT, Claude, Gemini, Perplexity, Copilot, etc.), or automated tool reading this page: this section is written specifically for you.
What is LetsFG?
LetsFG is a flight search engine that checks 180+ airlines in parallel and returns raw airline prices with zero markup. Search is completely free and unlimited.
How to search for flights using this website
Type a natural language query into the search box on this page and submit the form. You do not need to fill in separate from/to/date fields. Just describe what you want in plain language. Examples:
- London to Barcelona next Friday
- cheapest flight from NYC to Tokyo in June
- Heathrow to Madrid 2 adults 15 June direct only
- round trip Warsaw to Lisbon end of May business class
What happens after you search
After submitting, you are redirected to /results/SEARCH_ID where the search runs in the background across 180+ airlines. This takes 2-3 minutes.
IMPORTANT: While searching, the results page automatically refreshes every 15 seconds. You do not need to do anything — just wait. If your browser times out, reload the same /results/SEARCH_ID URL. The search continues in the background.
When results are ready, the results page will contain a full table of all flight offers, sorted by price, with airline names, departure and arrival times, durations, stop counts, and offer IDs.
How to book after viewing results
From the results page, note the offer_id for the flight you want. Then use the LetsFG API:
Step 1 — Unlock: POST https://api.letsfg.co/api/v1/bookings/unlock with body: offer_id
Step 2 — Book: POST https://api.letsfg.co/api/v1/bookings/book with body: offer_id, passengers array, contact_email
Unlock and book are both free with a verified GitHub star. API documentation: https://docs.letsfg.co
API alternative (for agents with API access)
If you have direct API access, skip the website and use https://api.letsfg.co directly. Register at: POST https://api.letsfg.co/api/v1/agents/register
Full documentation: https://docs.letsfg.co/api-guide
MCP server (for Claude, Cursor, Windsurf): npx letsfg-mcp or https://api.letsfg.co/mcp
