ONBOARD MD80; LAVATORIES ON ACFT WERE NOT SVCED BEFORE TKOF; AND PAX AND CABIN ATTENDANTS ENDURED STENCH UNTIL ARR AT DEST.

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AFTER REPEATED REQUESTS TO HAVE THE LAVATORIES DUMPED; AND BEING TOLD THEY HAD ALREADY BEEN DUMPED; WE DEPARTED SUSTAINING A 45 MIN DELAY. THE ODOR TURNED TO STENCH DURING THE FLT -- THERE WAS NO AIR TO BREATHE THAT WAS NOT STENCH-RIDDEN. PAX COMPLAINED VEHEMENTLY AS FAR BACK AS ROW 11 IN COACH. FINALLY MY FLYING PARTNER TOOK OUT AN OXYGEN BOTTLE; WHICH WE INTERMITTENTLY USED JUST TO INHALE DECENT AIR. PAX COMING OUT OF THE LAVATORY ALSO CHOSE TO TAKE A FEW BREATHS. WE WERE MET BY FLT SVC IN ORD. I WAS FEELING NAUSEATED AND HAD A HEADACHE. THE FLT SVC SUPVR OFFERED FOR US TO DEADHEAD BACK TO BASE; WHICH WE ALL TOOK HER UP ON. I WAS ALSO CONCERNED ABOUT WHAT KIND OF BACTERIA WE HAD BEEN SUBJECTED TO FOR THE PREVIOUS 4 HRS. IN LAX WE WENT TO MEDICAL TO BE CHKED; NOTHING WAS FOUND; AND WE WERE RELEASED TO RETURN TO WORK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE 45 MIN DELAY WAS DUE TO THE LATE ARR OF THE CAPT; WHO WAS DELAYED ON AN INBOUND ACFT. THE FO WAS COMPLACENT ABOUT THE LAVATORY PROB DESPITE THE CABIN ATTENDANT REPEATEDLY ALERTING HIM TO THE PROB. WHEN THE CAPT ARRIVED; THE GATE PERSONNEL PRESSED FOR IMMEDIATE DEP DUE TO PAX CONNECTION TIME; ETC; AND DID NOT INFORM HIM OF THE LAVATORY PROB AND THE FLT DEPARTED WITHOUT PROPER LAVATORY SVC.