I have a Pan Am timetable from 1972-73 which lists all air fares, routings and stopovers if anybody had a specific request.. The prices were listed as one way only for the F and Y fares (I doubled to make RT). The YE21 and YE45 had rules to them (YE21 could not return until 14 days after departure, YE45 was 22 days after departure). Some routings that had multiple stops were allowed stopovers as well.

for example:

SFO & LAX - LHR roundtrip (nonstop using 747)
F: $1222.00
Y: $752.00
YE21: $529.00 (stay 14 days)
YE45: $369.00 (stay 22 days)

LAX & SFO-SYD (stops in HNL first then nonstop HNL to SYD or HNL/NAN/SYD or HNL/NOU/SYD using 747 or 707 aircraft depending on day
F: $1640.00
Y: 1178.00
YE21: 833.00
YE45: n/a

JFK-London
F: $842
Y: $484
YE21: $349 (have to stay 14 days)
YE45: $240 (have to stay 22 days)

JFK-Tehran (for historical sake - several stops en route in places such as either London, Paris, Frankfurt, Rome, onward to places US airlines do not even fly today (Istanbul, Ankara, Beirut, Damascus to Tehran using 707 or 747 aircraft)
F: $1648
Y: $1088
YE21: $778
YE45: n/a

From NY, Delhi was the most expensive flight eastbound at $2,100 RT in First and $1320 in Y.

SFO to HKG
(either Flt #1: via LAX, HNL, Tokyo: same aircraft) or (1 stop Tokyo daily same aircraft)
F: $1702
Y: $1020
YE21: $868

(BTW interesting trivia in 1973, Pan Am's Flight #1 was a B747 and started in SFO at 6:30 am continuing on to LAX (no local traffic allowed), HNL, Tokyo, HKG, BKK, Delhi-Karachi, Delhi-Tehran, Karachi-Beirut, Tehran-Beirut, Istanbul, Frankfurt, London, New York)

I was an airline GEEK in my young days, so I love posting this kind of stuff for those who also share that passion.