Miles & More (Lufthansa, Austrian, Swiss, and other partners) - Fares for FRA-BOS

I am looking to book an Y ticket FRA-BOS r/t for either 10/8 to 12/8 or the following weekend from 17/8 to 19/8. I was very surprised when I saw the differences in pricing.

For FRA-BOS-FRA on 10-12/8 in T class (non changable, 50% miles), LH.com quotes me 1100€.
For the same routing the following weekend in S and V class (upgradeable and 100% miles), the website gives me 900€.

Is that a mistake or have they lowered the fares for the winter season significantly?

Thanks for any insight :)

Indeed the lower fare season starts with departures after the 16AUG:

>fqd frabos/alh/ky/r,u/d10aug
FQD FRABOS/ALH/KY/R,U/D10AUG
MORE FARES AVAIL IN USD XF MAY APPLY
4.14XA/5.79XY EXCLUDED
OTHER TAX MAY APPLY
ROE 0.801126 UP TO 1.00 EUR SURCHG MAY APPLY-CK RULE
10AUG12**10AUG12/LH FRABOS/NSP;AT/TPM 3660/MPM 4392
*** FOR STAR ALLIANCE RTW* SEE FQD XYZXYZ EG:FRAFRA ***
LN FARE BASIS OW EUR RT B PEN DATES/DAYS AP MIN MAXFR
01 THNCDEW 710 T NRF S20JUN 15AUG+ 7+ + 12MVR
02 SHNCDEW 770 S NRF S20JUN 15AUG+ 4+ + 12MVR
03 WHRCDEW 864 W + S20JUN 15AUG+ 1+ + 12MVR
04 VHRCDEW 944 V + S20JUN 15AUG+ + + 12MVR
05 QHRCDEW 1064 Q + S20JUN 15AUG+ + + 12MVR
06 HHRCDEW 1214 H + S20JUN 15AUG+ + + 12MVR
07 UHRCDEW 1384 U + S20JUN 15AUG+ + + 12MVR
08 MHRCDEW 1584 M + S20JUN 15AUG+ + + 12MVR
09 BFFDEW 1834 B - - - + - - 12MVR
10 YFFDEW 2864 Y - - - + - - 12MVR
11 Y77RT 3292 Y - - - + - - 12MVM
12 Y77OW 2304 Y - - - + - - - VM
> PAGE 1/ 1
>fqd frabos/alh/ky/r,u/d17aug
FQD FRABOS/ALH/KY/R,U/D17AUG
MORE FARES AVAIL IN USD XF MAY APPLY
4.14XA/5.79XY EXCLUDED
OTHER TAX MAY APPLY
ROE 0.801126 UP TO 1.00 EUR SURCHG MAY APPLY-CK RULE
17AUG12**17AUG12/LH FRABOS/NSP;AT/TPM 3660/MPM 4392
*** FOR STAR ALLIANCE RTW* SEE FQD XYZXYZ EG:FRAFRA ***
LN FARE BASIS OW EUR RT B PEN DATES/DAYS AP MIN MAXFR
01 KKNNZDEW 192 K NRF S17AUG 31OCT+ 7+SU+ 3MVR
B31JUL E17AUG
O31OCT -
02 LKNCDEW 310 L NRF S16AUG 23OCT+ 7+ + 12MVR
03 TKNCDEW 370 T NRF S16AUG 23OCT+ 7+ + 12MVR
04 SKNCDEW 430 S NRF S16AUG 23OCT+ 4+ + 12MVR
05 WKRCDEW 510 W + S16AUG 23OCT+ 1+ + 12MVR
06 VKRCDEW 590 V + S16AUG 23OCT+ + + 12MVR
07 QKRCDEW 710 Q + S16AUG 23OCT+ + + 12MVR
08 HKRCDEW 860 H + S16AUG 23OCT+ + + 12MVR
09 UKRCDEW 1030 U + S16AUG 23OCT+ + + 12MVR
10 MKRCDEW 1230 M + S16AUG 23OCT+ + + 12MVR
11 BFFDEW 1834 B - - - + - - 12MVR
> PAGE 1/ 2
>

Thanks for the insight! Quite a difference.. Is that similar for other US cities? For example NYC or ORD?

The seasons are the same for everything westbound north america. Eastbound is a bit different, depends on the vacation schedules.