A TON of US cities to Europe roundtrip in $300′s – $500′s (various full-service airlines)

A really big sale from a bunch of US cities to various European cities
Travel window: Now through December. January through April. Some variation to this based on route.
Airlines:
Aer Lingus
Air Canada
Air France
American
British Airways
Brussels Airlines
Delta
KLM
Lufthansa
Swiss
TAP Portugal
Turkish
United
How To: Use Google Flights to search and use their Calendar feature to find the lowest priced fares.
Source: email alert from Flight Baron
ATLANTA (ATL):
Paris (CDG) – $498 – Dead?
AUSTIN (AUS):
Dublin (DUB) – $545 – now $568+?
BALTIMORE (BWI):
Brussels (BRU) – $433
Dublin (DUB) – $478
Frankfurt (FRA) – $500
Geneva (GVA) – $489
Inverness (INV) – $408
Manchester (MAN) – $465
Munich (MUC) – $483
Rome (FCO) – $480
Zurich (ZRH) – $436
BOSTON (BOS):
Brussels (BRU) – $446
Frankfurt (FRA) – $474
Munich (MUC) – $469
Paris (CDG) – $472
Vienna (VIE) – $431
CHARLOTTE (CLT):
Dublin (DUB) – $516
CHICAGO (ORD):
Athens (ATH) – $558
Budapest (BUD) – $500
Dubrovnik (DBV) – $549
Dusseldorf (DUS) – $415
Frankfurt (FRA) – $434
Krakow (KRK) – $433
Moscow (VKO) – $515
Munich (MUC) – $428
Oslo (OSL) – $450
Prague (PRG) – $419
Warsaw (WAW) – $407
CLEVELAND (CLE):
Rome (FCO) – $478
DALLAS (DFW):
Frankfurt (FRA) – $434
Munich (MUC) – $428
DENVER (DEN):
Amsterdam (AMS) – $454
Brussels (BRU) – $368
Paris (CDG) – $490
FORT LAUDERDALE (FLL):
Amsterdam (AMS) – $425
Geneva (GVA) – $411
Paris (CDG) – $448
HOUSTON (HOU):
Brussels (BRU) – $424
Frankfurt (FRA) – $500
Geneva (GVA) – $475
Munich (MUC) – $483
Paris (CDG) – $492
Zurich (ZRH) – $436
LOS ANGELES (LAX):
Budapest (BUD) – $407
Dusseldorf (DUS) – $456
Hamburg (HAM) – $416
Prague (PRG) – $406
Stuttgart (STR/ZWS) – $434
MIAMI (MIA):
Brussels (BRU) – $476
Budapest (BUD) – $420
Dusseldorf (DUS) – $465
Hamburg (HAM) – $416
Geneva (GVA) – $407
Naples (NAP) – $493
Paris (CDG) – $448
Prague (PRG) – $424
Stuttgart (STR/ZWS) – $434
MINNEAPOLIS (MSP):
Frankfurt (FRA) – $426
Helsinki (HEL) – $449
Inverness (INV) – $387
Manchester (MAN) – $442
Munich (MUC) – $421
NASHVILLE (BNA):
Dublin (DUB) – $533
NEWARK (EWR):
Brussels (BRU) – $419
Budapest (BUD) – $407
Frankfurt (FRA) – $483
Geneva (GVA) – $455
Krakow (KRK) – $433
Nuremberg (NRE) – $430
Paris (CDG) – $441
Prague (PRG) – $416
Stuttgart (STR/ZWS) – $434
Warsaw (WAW) – $407
NEW YORK (JFK):
Budapest (BUD) – $437
Brussels (BRU) – $484
Frankfurt (FRA) – $496
Krakow (KRK) – $433
Nuremberg (NRE) – $438
Paris (CDG) – $461
Prague (PRG) – $432
Stuttgart (STR/ZWS) – $434
Trondheim (TRD) – $405
Warsaw (WAW) – $412
Zurich (ZRH) – $399
OAKLAND (OAK):
Budapest (BUD) – $448
Frankfurt (FRA) – $500
Munich (MUC) – $488
ORLANDO (MCO):
Dusseldorf (DUS) – $456
Hamburg (HAM) – $433
Munich (MUC) – $432
Stuttgart (STR/ZWS) – $463
Vienna (VIE) – $431
Zurich (ZRH) – $420
SAN FRANCISCO (SFO):
Brussels (BRU) – $433
Budapest (BUD) – $407
Frankfurt (FRA) – $500
Hamburg (HAM) – $416
Milan (MXP) – $461
Munich (MUC) – $483
Oslo (OSL) – $456
Prague (PRG) – $419
Stuttgart (STR/ZWS) – $434
Vienna (VIE) – $430
Warsaw (WAW) – $407
Zurich (ZRH) – $436
SAN JOSE (SJC):
Brussels (BRU) – $433
Budapest (BUD) – $439
Dusseldorf (DUS) – $456
Frankfurt (FRA) – $500
Geneva (GVA) – $489
Hamburg (HAM) – $416
Krakow (KRK) – $453
Manchester (MAN) – $454
Munich (MUC) – $483
Prague (PRG) – $447
Stockholm (ARN) – $436
Vienna (VIE) – $453
Zurich (ZRH) – $440
SEATTLE (SEA):
Frankfurt (FRA) – $504
Munich (MUC) – $455
ST. LOUIS (STL):
Dublin (DUB) – $533
WASHINGTON DC (DCA):
Brussels (BRU) – $433
Frankfurt (FRA) – $500
Geneva (GVA) – $485
Inverness (INV) – $411
Manchester (MAN) – $465
Munich (MUC) – $483
Oslo (OSL) – $390
Rome (FCO) – $480
Stockholm (ARN) – $448
Zurich (ZRH) – $436
WASHINGTON DC (IAD):
Brussels (BRU) – $433
Frankfurt (FRA) – $500
Geneva (GVA) – $475
Inverness (INV) – $421
Munich (MUC) – $483
Oslo (OSL) – $365
Rome (FCO) – $478
Trondheim (TRD) – $416
Zurich (ZRH) – $436