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Recipe · Flights API

Cheapest-date scan with ChatGPT

The tool accepts a date RANGE and expands it internally: one call, not thirty. The agent gets a fare per day and answers with the cheapest date and how much picking it saves. Over REST, the same scan is a parallel burst of per-date requests; the rate limits (150–500/min by tier) exist exactly for this.

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Step 1 · Connect

Add the MCP server as a connector

Settings → Connectors (developer mode) → add the server URL. The key rides on the server URL; ChatGPT never sees it in chat.

connect
https://flights.flightpowers.com/mcp?rapidapi_key=YOUR_RAPIDAPI_KEY

Bring your own RapidAPI key: every request is billed to your own subscription, never ours.

Step 2 · Ask it

The prompt

Verbatim: paste it, or anything shaped like it. The agent maps it to the call below.

“What is the cheapest day to fly LIS to New York in November?”

Step 3 · Under the hood

What the agent calls

No glue code: the agent reads the tool schema, picks the tool, and fills these parameters from your prompt.

tool call
// search_oneway_flights
{
  "from_airport": "LIS",
  "to_airport": "JFK",
  "departure_date_from": "2026-11-01",
  "departure_date_to": "2026-11-30",
  "limit": 5
}

Step 4 · Read the response

Fields your logic reads

The response is flat JSON. These are the fields this recipe branches on, with what each one means.

departure_datestring (YYYY-MM-DD)

The date this fare applies to, the axis a date-range scan pivots on.

pricestring

The fare as Google Flights displays it: “$56”. The numeric twin price_as_number rides alongside for sorting and arithmetic.

price_range_in_relation_to_other_periods"low" | "typical" | "high" | null

Google’s verdict on the current fare against that band, the single field alerting, ranking, and “book now” logic branch on.

Questions, answered plainly

Is my key billed to me?
Yes. The MCP server is bring-your-own-key: ChatGPT sends your RapidAPI key with each call and usage meters against your own subscription on RapidAPI. There is no FlightPowers account and no second bill.
Does this need a server of mine?
No. The MCP servers are hosted at flights.flightpowers.com and hotels.flightpowers.com: you add a URL to ChatGPT, not a deployment.
What does it cost?
The Google Flights Live API's free tier is 10 requests/month with a hard cap: enough to verify your key works, not to evaluate. The PRO plan is $10/month for 2,500 requests, and every plan includes every endpoint. Budget one request per date scanned: a 30-day sweep meters as 30 requests.

Also works with

Cheapest-date scan, elsewhere in your stack

Cheapest-date scan in ClaudeCheapest-date scan in CursorCheapest-date scan in Claude CodeCheapest-date scan in n8nCheapest-date scan in OpenClaw

More recipes

More to build in ChatGPT

One-way flight search

Flights API · search_oneway_flights

Round-trip search

Flights API · search_roundtrip_flights

Price-insights check

Flights API · search_oneway_flights

Hotel search

Hotels API · search_hotels

Rate-parity check

Hotels API · find_hotel_by_name

Fare-alert cron

Flights API · search_oneway_flights

Ready to judge a fare, not just fetch it?

Live Google Flights and Booking.com data, with the price band and verdict attached to every result. Free tier on RapidAPI, no card to try.

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Free tier: 10 requests/month. No card to try.