search_roundtrip_flights

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Search real-time round-trip flights on Google Flights, priced as paired legs rather than two separate one-ways. Input: origin and destination IATA codes (destination may be a list), a departure date or range, and either a return date or a trip length in nights. Returns the total price for both legs, per-leg airline, stops and duration, and a single bookable buy_link for the trip. Use it for any return-trip fare question. For a flexible search make ONE call: pass departure_date_from / departure_date_to for the outbound range and `nights` instead of return_date to compare trip lengths -- '5 to 7 nights in Rome sometime in May' is one call. Requires the caller's own RapidAPI key. Each date/destination combination is one billed request; the count and the plan's remaining quota come back in `api_usage`.