SearchGoogleDates finds the cheapest travel dates across a flexible date range via Google Flights.
Departure airport IATA code (e.g. "JFK").
Arrival airport IATA code (e.g. "LHR").
Start of date range in YYYY-MM-DD format.
End of date range in YYYY-MM-DD format.
Trip duration in days (required for round-trip searches).
Whether to search for round-trip flights.
Cabin class: ECONOMY, PREMIUM_ECONOMY, BUSINESS, or FIRST.
Stop filter: ANY, NON_STOP, ONE_STOP, or TWO_PLUS_STOPS.
Departure time window in HH-HH format (e.g. "6-20").
Airline IATA codes to filter by (e.g. ["BA", "AA"]).
Whether to sort results by price (lowest first).
Number of adult passengers (1-9).