Via ITA Software.
There are lower ($503) and slightly higher ($528) fares which require an overnight in FRA.
Code:
United Airlines Flight UA950 on a Boeing 777 (jet) in coach class
Departs San Francisco, CA (SFO) Sat, Nov 11 7:45a 4 hrs 52 min
Arrives Washington, DC (IAD) 3:37p
United Airlines Flight UA902 on a Boeing 777 (jet) in coach class
Departs Washington, DC (IAD) Sat, Nov 11 6:04p 8 hrs 6 min
Arrives Munich, Germany (MUC) Sun, Nov 12 8:10a
Lufthansa Airlines Flight LH458 on an Airbus A340 (jet) in coach class
Departs Munich, Germany (MUC) Sun, Nov 12 3:50p 12 hrs 10 min
Arrives San Francisco, CA (SFO) 7:00p
Fare (A1): UA SFOMUC WLWSNY2E fare (rules) $180.50
Fare (A2): LH MUCSFO WLWSNY2E fare (rules) $180.50
Tax: UA YQ surcharge $70.00
Tax: US September 11th Security Fee $5.00
Tax: US International Departure Tax $14.50
Tax: US Passenger Facility Charge $9.00
Tax: US International Arrival Tax $14.50
Tax: German Passenger Service Charge €11.88
Tax: German Airport Security Tax €6.00
Tax: US Customs Fee $5.00
Tax: US Immigration Fee $7.00
Tax: USDA APHIS Fee $5.00
Total for 1 adult passenger: $513.90
An alternate combination if you don't want a pure mileage run:
Nov 10: SFO - DEN - IAD - MUC
Nov 12: MUC - SFO
$517.20 USD
Rules:
BASIC SEASON WEEKEND INSTANT PURCHASE W
UA/LH JOINT SALE FARE FROM U.S./P.R./V.I. TO AREA 2
TICKETS MUST BE ISSUED ON/BEFORE 27SEP 06.
PERMITTED 30OCT 06 THROUGH 31MAR 07 ON THE OUTBOUND TRANSATLANTIC SECTOR.
TRAVEL IS NOT PERMITTED 15DEC 06 THROUGH 07JAN 07.
THE FARE COMPONENT MUST INCLUDE TRAVEL VIA TRANSATLANTIC SECTORS ON ONE OR MORE OF THE FOLLOWING
UA FLIGHTS 1 THROUGH 1699
UA FLIGHTS 5200 THROUGH 8099
UA FLIGHTS 8725 THROUGH 9500
LH FLIGHTS 1 THROUGH 1399
LH FLIGHTS 3000 THROUGH 4999
LH FLIGHTS 9050 THROUGH 9439.
RESERVATIONS FOR ALL SECTORS ARE REQUIRED AT LEAST 21 DAYS BEFORE DEPARTURE.
RETURN TRAVEL FROM INBOUND TRANSATLANTIC SECTOR MUST COMMENCE NO EARLIER THAN THE FIRST SUN AFTER DEPARTURE OF THE OUTBOUND TRANSATLANTIC SECTOR.
THE ORIGINAL AND THE REISSUED TICKET MUST BE ANNOTATED - NONREF/NONEND/NONTRANS - AND - VALID UA/LH/SK/BD/OS ONLY- AND - CHANGE FEE APPLIES - IN THE ENDORSEMENT BOX.