Round-trip is almost always cheaper than two one-ways — airlines discount return fares by 15-30%. The exception: budget carriers (Ryanair, Wizz Air) where one-way pricing is standard. For transatlantic routes, round-trip saves $200-500 versus booking separately. Below: every route we track with roundtrip pricing.
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Primary sources over aggregators. Prices from airline/rail/hotel APIs; seasonality from tourism boards; safety stats from national archives where possible.