Last edit by: cesco.g
There are two categories of US cities involved, DL hubs and other, generally secondary, airports.
From some DL Hubs, UA P fares are valid to a much wider range of cities in Europe:
SLC/MSP/DTW/ATL/CVG/MEM-AMS/MXP/FCO/CDG/MLA/VCE/TRN/FLR/NAP/PMO/CTA/BUD/PRG/CPH/IST/WAW/ARN/OSL/KRK/PRG/TLL/RIX/etc
(but not JFK nor LAX?)
Other airports are valid to a smaller set of cities in Europe:
BOS/SJC/SMF/MOD/BWI/BUR/ONT/SNA/PSP/HNL/SEA/PDX/AUS/PIT/TUS/TPA/ALB/etc/etc-AMS/MXP/FCO/CDG/MLA/VCE/TRN/FLR/NAP/PMO/CTA/etc
Most UA hubs don't have the fare filed (not SFO for sure), but apparently EWR has at least EWR-VCE/NCE (but not EWR-MXP/PMO/FCO/CDG)
Some destinations in Europe have a slightly higher base fare:
MRS/LYS
(please add more cities to either origin or destination side that are valid)
Be careful in your airline selection - there are PQM/RDM implications to this. For example, for the UA program, UA P earns 150% PQM/RDM, LH P earns 100% PQM/RDM, and it appears that OS P earns nothing.
Similarly it looks like UA P class credited to Aegean (A3) earns nothing. Visit this United webpage then click on the Star Alliance partner to determine mileage earnings.
From some DL Hubs, UA P fares are valid to a much wider range of cities in Europe:
SLC/MSP/DTW/ATL/CVG/MEM-AMS/MXP/FCO/CDG/MLA/VCE/TRN/FLR/NAP/PMO/CTA/BUD/PRG/CPH/IST/WAW/ARN/OSL/KRK/PRG/TLL/RIX/etc
(but not JFK nor LAX?)
Other airports are valid to a smaller set of cities in Europe:
BOS/SJC/SMF/MOD/BWI/BUR/ONT/SNA/PSP/HNL/SEA/PDX/AUS/PIT/TUS/TPA/ALB/etc/etc-AMS/MXP/FCO/CDG/MLA/VCE/TRN/FLR/NAP/PMO/CTA/etc
Most UA hubs don't have the fare filed (not SFO for sure), but apparently EWR has at least EWR-VCE/NCE (but not EWR-MXP/PMO/FCO/CDG)
Some destinations in Europe have a slightly higher base fare:
MRS/LYS
(please add more cities to either origin or destination side that are valid)
Be careful in your airline selection - there are PQM/RDM implications to this. For example, for the UA program, UA P earns 150% PQM/RDM, LH P earns 100% PQM/RDM, and it appears that OS P earns nothing.
Similarly it looks like UA P class credited to Aegean (A3) earns nothing. Visit this United webpage then click on the Star Alliance partner to determine mileage earnings.
[FARE GONE] Lots of UA ATL-AMS (and other cities) Z fares; less than $2k for July
#18
Join Date: Aug 2009
Location: IAH
Programs: SPG Platinum, Hyatt Diamond, IHG Gold Ambassador, Marriott Gold
Posts: 519
Now ~$1500 for pretty much all the fares. Booking a SMF fare for myself ... optimistic that a one of the United Express segments will have a schedule change and I'll be able to change it to SFO. 
Worth noting that this works for UA/LX/LH. LX still awards 150% RDM/EQM when credited to UA if you want to try something a bit nicer.

Worth noting that this works for UA/LX/LH. LX still awards 150% RDM/EQM when credited to UA if you want to try something a bit nicer.

#19
Join Date: Aug 2008
Location: SF Bay Area
Programs: UA 1K, Hyatt Globalist, Virtuoso Travel Agent, Commercial Pilot
Posts: 2,070
Code:
1 UA5427Y 09AUG J SMFSFO HK1 1155A 1241P HRS /DCUA OPERATED BY /SKYWEST DBA UNITED EXPRESS 2 UA 990P 09AUG J SFOCDG HK1 240P 1045A 10AUG S HRS /DCUA 3 LX 633P 11AUG M CDGZRH*HK1 950A 1110A HRS /DCLX 4 LX 40P 11AUG M ZRHLAX*HK1 110P 445P HRS /DCLX 5 UA6462Y 11AUG M LAXSMF HK1 1035P 1158P HRS /DCUA OPERATED BY /SKYWEST DBA UNITED EXPRESS
#21
Join Date: Nov 2013
Location: LAX, LGB, SNA
Programs: AA EXP OWE, DL DM ST+, AS MVPG, UA, BA, WN CP, Hyatt E, Ritz Plat, HH GM
Posts: 3,184
#24
Join Date: Aug 2009
Location: IAH
Programs: SPG Platinum, Hyatt Diamond, IHG Gold Ambassador, Marriott Gold
Posts: 519
FYI, searching for airports around Houston, I am seeing cheap fares from AUS or SAT to AMS (via IAH) on UA ($1469) and AUS to CDG (via IAD) on UA ($1569); used 7/3-7/8/14 dates.
#29
Join Date: Sep 2010
Posts: 2,233
Not seeing any OneWorld yet....
Skyteam has some to Germany/Switzerland in the 2k range:
Aug 1-3 HNL-ATL-ZRH-ATL-HNL ~$1984ai (P,Z) (18338mi ~10.8cpm)
-OUTBOUND - PERMITTED 27JUN 14 THROUGH 30AUG 14 FOR EACH TRANSATLANTIC SECTOR.
INBOUND - PERMITTED 29JUN 14 THROUGH 04SEP 14 FOR EACH TRANSATLANTIC SECTOR.
-1 FREE STOPOVER PERMITTED ON THE PRICING UNIT IN ATL.
-FOR ROUND TRIP FARES.
Skyteam has some to Germany/Switzerland in the 2k range:
Aug 1-3 HNL-ATL-ZRH-ATL-HNL ~$1984ai (P,Z) (18338mi ~10.8cpm)
-OUTBOUND - PERMITTED 27JUN 14 THROUGH 30AUG 14 FOR EACH TRANSATLANTIC SECTOR.
INBOUND - PERMITTED 29JUN 14 THROUGH 04SEP 14 FOR EACH TRANSATLANTIC SECTOR.
-1 FREE STOPOVER PERMITTED ON THE PRICING UNIT IN ATL.
-FOR ROUND TRIP FARES.
#30
Join Date: Jan 2005
Location: SoCal
Programs: AA EP, OZ*G, Avis CHM, Hertz PC, Hilton Diamond, Marriott Gold
Posts: 902
Here's a sample from SAN, all on AC, booking into Z. Weekend in Rome, anyone?
1*AC1886Z 07AUG TH SANYYZ SS1 810A 400P/O $ E
2 AC 890Z 07AUG TH YYZFCO SS1 650P 920A#1/O $ E
3 AC 891Z 11AUG MO FCOYYZ SS1 1120A 300P/O $ E
4*AC1887Z 11AUG MO YYZSAN SS1 640P 847P/O $ E
PNR PRICED ON 01APR FOR TKTG ON 01APR
* NONREF/CHGFEE
* PRICING RULES VALIDATING CARRIER DEFAULT AC
** 07AUG DEPARTURE DATE/ 04APR IS LAST DATE TO TICKET
** TICKETING WITHIN 72 HRS AFTER SEGMENT SELL REQUIRED **
* FARE MAY CHANGE UNLESS TICKETED *
TICKET BASE USD TX/FEE USD TKT TTL USD
ADT01 500.00 973.90 1473.90
FBC ADT ZNC2S
Now we just need ONEWORLD to match~
1*AC1886Z 07AUG TH SANYYZ SS1 810A 400P/O $ E
2 AC 890Z 07AUG TH YYZFCO SS1 650P 920A#1/O $ E
3 AC 891Z 11AUG MO FCOYYZ SS1 1120A 300P/O $ E
4*AC1887Z 11AUG MO YYZSAN SS1 640P 847P/O $ E
PNR PRICED ON 01APR FOR TKTG ON 01APR
* NONREF/CHGFEE
* PRICING RULES VALIDATING CARRIER DEFAULT AC
** 07AUG DEPARTURE DATE/ 04APR IS LAST DATE TO TICKET
** TICKETING WITHIN 72 HRS AFTER SEGMENT SELL REQUIRED **
* FARE MAY CHANGE UNLESS TICKETED *
TICKET BASE USD TX/FEE USD TKT TTL USD
ADT01 500.00 973.90 1473.90
FBC ADT ZNC2S
Now we just need ONEWORLD to match~