The Eagles matched the ladder-leading Saints for three quarters before going down by 20 points, and now face Port Adelaide at AAMI Stadium on Sunday.
John Worsfold's men also pushed Geelong to the wire at Subiaco Oval in recent weeks, and beat reigning premier Hawthorn at home in round 13.
Spangher, 22, is yet to experience a win on the road with West Coast, but said a repeat of Sunday's form against the Saints would snap their losing run away from home.
"The only thing we can do is just go out there and do what we did for three quarters last week, and we should get the result we want," he said from Subiaco Oval on Monday.
"It's the same process every week; nothing really changes as far as preparation (goes), and then we have to see what happens.
"Playing Port Adelaide off the back of a loss, you never know."
West Coast's latest two losses on the road have been against Melbourne and Richmond, two teams that have just three wins each for the season.
Spangher said backing up from tough home games hadn't been an issue for the Eagles; rather, they'd faced several opponents on the road at inopportune times.
Melbourne was desperate to honour ill president Jim Stynes in round 14, while Richmond was buoyed by Jade Rawlings' first match as coach a fortnight previously.
"We’ve played Melbourne and Richmond under probably unique circumstances, which were probably games which were winnable," Spangher said.
"Obviously it's disappointing to lose to the lower sides – games which you probably should win. When you see us have such, I think, great performances against St Kilda and Geelong, that's just promising.
"The last games at home, Hawthorn included, have been really quite good. It's just a matter of getting that consistency, not only travelling but also for the four quarters."
Spangher, who has played seven of his 14 career games this season, said he was enjoying his most consistent year since being recruited in the 2005 NAB AFL Draft.
Injuries delayed the Victorian's debut until last season, but he said he was now enjoying the chance to prove himself as contract negotiations draw near.
"The next few weeks are important for a lot of people, but when you're out of contract at the end of the year, you always sub-consciously find something extra," he said, adding that he'd "most certainly" prefer to stay with the Eagles.
"There's still a long way to go in the season, and there's plenty of jobs to do ahead of that," he said.
"That's in the front of my mind, and probably in the back of my mind is contract negotiations."
