DELAYS DURING TAXI-OUT AND EXTENSIVE VECTORING FOR WX AFTER DEP CAUSED B732 CREW TO DIVERT TO AUS FOR FUEL BEFORE CONTINUING TO DEST.

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CLRNC DELIVERY GAVE US A RERTE ON OUR IAH-DAL RTE. I TOOK A CALCULATION OF OUR FUEL LOAD; AND DECIDED WITH THE CONTINGENCY FUEL ONBOARD; WE COULD SAFELY FLY THE NEW RTE WITHOUT GETTING ADDITIONAL FUEL. NOW EVENTS STARTED TO PLAY AGAINST US. FROM PUSHBACK TO TKOF WAS 51 MINS DUE TO HEAVY DEP TFC FROM IAH. BEFORE TKOF; I MADE ANOTHER FUEL CALCULATION AND FIGURED WE STILL HAD ENOUGH FOR OUR NEW FILED RTEING. ONCE AIRBORNE THOUGH; INSTEAD OF OUR RTEING OF SPURS AND JEN; WE WERE GIVEN VECTORS DUE W. AFTER PASSING OVER AUSTIN; WE STILL COULD NOT GET BACK ON COURSE TOWARD DALLAS; PROBABLY DUE TO THE BACKLOG OF TFC; THEN TO THE WX; WHICH DIDN'T LOOK THAT BAD. SOON WE HEARD THAT AIR TFC WAS HOLDING OVER JEN. AT THAT POINT; I REALIZED DIVERTING TO AUS WAS A BETTER COURSE OF ACTION. WE LANDED IN AUS WITHOUT FURTHER DIFFICULTY. HINDSIGHT BEING WONDERFUL; I SHOULD HAVE GOTTEN MORE FUEL IN IAH BEFORE LEAVING. IF ANYONE OF THE OTHER FACTORS; IE; EXTENSIVE GND DELAYS; BEING VECTORED OUT OF OUR WAY; HOLDING AT JEN; HAD NOT PRESENTED ITSELF; IT WOULD HAVE BEEN FINE. UNFORTUNATELY; THEY WORKED AGAINST US. SUPPLEMENTAL INFO FROM ACN 586751: I THINK NEXT TIME; I WILL INSIST THAT WE GET DISPATCH INVOLVED RIGHT AWAY.