Cary Williams' third interception in three games gave the ball back to Baltimore. Flacco completed two 20-yard passes to Boldin before hitting Torrey Smith for a 19-yard score with 41 seconds left in the half.
Facing the top-ranked pass defense in the NFL, Flacco went 13 for 18 for 174 yards in the first half.
The Ravens opened the game with a 14-play drive that lasted over seven minutes and ended with a 38-yard field goal.
Dallas answered with an 80-yard march culminated by a 22-yard run by Felix Jones and featuring a 28-yard run by Murray, longest against the Ravens since 2010. The Cowboys' next possession stretched more than six minutes, covered 56 yards and produced a 42-yard field goal by Bailey for a 10-3 lead.
NOTES: Ravens C Matt Birk played in his 200th NFL game. . Bobbie Williams started at guard for the Ravens in place of Ramon Harewood, who was inactive after five straight starts. . Baltimore Orioles manager Buck Showalter accompanied the Ravens captains to the coin toss and received a standing ovation. . Cowboys DL Sean Lissemore left in the first quarter with an ankle injury.
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