Ticket type
Almost always cheaper than two one-ways, here's how the math works and when it breaks down.
Airlines price round-trip tickets as a single fare, typically 20–40% below the sum of two one-way fares on the same flights. This reflects how airline revenue management has always worked: a single sale of both legs is worth more than two independent sales.
Round-trip also unlocks more fare classes, many refundable / fully-changeable fare buckets only exist on round-trip itineraries. If flexibility matters, book round-trip even if you're not 100% sure you'll use the return.
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