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Google Flights API

$0.005 per call, pay only for 200 responses
Search Google Flights for flight itineraries and current fares.

/flights5 credits / requestSearch

x402 pay per call

$0.005 per successful call, paid in USDC on Base. No account or API key required. The live PAYMENT-REQUIRED header quotes the authoritative price.

curl request

curl -i 'https://api.fastaf.co/x402/v1/flights?departure_id=JFK&arrival_id=LHR&outbound_date=2027-01-15&type=2'

Example 402 payment challenge

Illustrative recipient address, not a payment destination. Request a fresh challenge, sign it with an x402 v2 client and retry the same URL with PAYMENT-SIGNATURE. The header is base64 JSON v2; the compatibility body uses v1 aliases on Base. Only successful results settle.

HTTP/1.1 402 Payment Required
Content-Type: application/json
PAYMENT-REQUIRED: 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

{
  "error": "payment_required",
  "x402Version": 2,
  "resource": {
    "url": "https://api.fastaf.co/x402/v1/flights?departure_id=JFK&arrival_id=LHR&outbound_date=2027-01-15&type=2",
    "description": "Google Flights",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "5000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x1111111111111111111111111111111111111111",
      "maxTimeoutSeconds": 300,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

Decoded PAYMENT-REQUIRED header

{
  "x402Version": 2,
  "resource": {
    "url": "https://api.fastaf.co/x402/v1/flights?departure_id=JFK&arrival_id=LHR&outbound_date=2027-01-15&type=2",
    "description": "Google Flights",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "5000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x1111111111111111111111111111111111111111",
      "maxTimeoutSeconds": 300,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

JSON discovery response example

Search Google Flights for flight itineraries and current fares. JSON response; source fields may vary. This example is illustrative.

{
  "best_flights": [
    {
      "price": 550,
      "flights": [
        {
          "departure_airport": {
            "id": "JFK"
          },
          "arrival_airport": {
            "id": "LHR"
          }
        }
      ]
    }
  ]
}

Response with an API key

The same data over REST with a prepaid key. The JSON body is the example above; failed requests are not charged.

curl -H "Authorization: Bearer $FASTAF_API_KEY" 'https://api.fastaf.co/v1/flights?departure_id=JFK&arrival_id=LHR&outbound_date=2027-01-15&type=2'

MCP tools

search_flights MCP tool calls require an API key or OAuth; x402 payments apply to HTTP data calls.

Full endpoint reference for agents

Pricing

x402: $0.005 per successful call, USDC on Base, no account. API key: 5 credits per request from one-time credit packs, without expiry. Credit packs are shared by every endpoint and never renew.

PackPriceCreditsPer callPer 1,000 calls
Starter$1020,000$0.0025$2.50
Growth$2975,000$0.00193$1.93
Scale$99300,000$0.00165$1.65
Pro$2991,000,000$0.0015$1.50
Business$7993,000,000$0.00133$1.33

Free: 500 credits every month after email verification, no card. See pricing. Alternatives: FastAF vs SerpApi, vs toll402, vs serp402, vs AgentBIT, vs Amazon PA-API.

Parameters

NameDescription
departure_idRequired three-letter uppercase IATA departure airport code; no default.
arrival_idRequired three-letter uppercase IATA arrival airport code; no default.
outbound_dateRequired outbound date in YYYY-MM-DD format; no default.
return_dateReturn date in YYYY-MM-DD format, on or after outbound_date; optional.
typeTrip type: 1 round trip, 2 one way; omitted uses source default.
adultsAdult passenger count, positive integer; omitted uses source default.
currencyThree-letter uppercase currency code; omitted uses source default.
hlInterface language code; omitted uses source default.
glTwo-letter country code; omitted uses source default.
travel_classCabin class: 1 economy, 2 premium economy, 3 business, 4 first; omitted uses source default.

Response fields

  • best_flights

Passing these fields to an LLM? See token-aware scraping: only what your LLM needs.

Building a travel agent? Read Google Flights API for AI agents for the request an agent sends and what to keep from the results.

Guides

FAQ

What input is required?

departure_id, arrival_id, outbound_date.

What does a call cost?

5 credits or $0.005 via x402. Start with 500 free credits every month after email verification; optional credit packs are available.

How much does one Google Flights API call cost?

With x402 it is $0.005 per successful call in USDC on Base, with no account. With an API key it is 5 credits per request, which is $0.0025 on the $10 Starter pack down to $0.00133 on the $799 Business pack. Failed requests are never charged.

Do I need an account or an API key for Google Flights API?

Not for x402: send the request, pay the 402 challenge in USDC and retry. For credits, sign up free, confirm your email and use the API key in the Authorization header. Accounts get 500 free credits every month after email verification; they do not apply to x402.

Other APIs

All APIs → · Guides and benchmarks on the blog →

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