Great question — answering as the UphillTech team:
There are a couple of very different cases here: Cost Especially on longer (non-regional) international flights, a round-trip ticket usually still costs substantially less than two one-way tickets (except award tickets purchased with points/miles.) I have encountered many instances where a one-way ticket was actually more expensive than the entire round-trip on the same route for international tickets. This used to be the case for U.S. domestic fights, too. Sometimes it still is, but usually nowadays a round-trip ticket costs exactly the sum of the two one-way fares for domestic tickets in the U.S., as you've noticed. Domestic/regional flights outside of North America are increasingly...
Full answer by reirab: https://travel.stackexchange.com/a/104745 (CC BY-SA 3.0).
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