Not exactly an exciting destination, but if you're looking for oneworld miles in the US you can fly from San Francisco (SFO), San Jose (SJC), Sacramento (SMF), Ontario (ONT), or Palm Springs (PSP) to Westchester County (HPN) for $92-$94 one-way or $185 roundtrip on AA this Spring (April/May) or next fall (Sept/Oct).

Connection is in Charlotte or Chicago.

SFO-CLT-HPN r/t is 5706 miles which is 3.24 cents per mile. If you were collecting tier points you'd receive 50 for the roundtrip journey.
SFO-ORD-HPN r/t is 5150 miles which is 3.59 cents per mile. If you were collecting tier points you'd receive 20 for the roundtrip journey.

Example - https://www.google.com/travel/flight...n&gl=en_US%5Cn

Example - https://www.google.com/travel/flight...n&gl=en_US%5Cn