The Ravens dominated the second quarter, scoring two touchdowns through the air to take a seven-point lead into halftime.
Alfred Morris's 1-yard touchdown run gave the Redskins a 14-7 lead at the end of the first quarter.
Griffin III was 10-of-15 passing for 180 yards and the one touchdown in the first half. He rushed only twice for five yards.
Morris carried 12 times in the first half, picking up 71 yards.
Flacco completed 10 passes for 127 yards and three touchdowns. Boldin caught two touchdowns and Dennis Pitta grabbed the third.
Ray Rice picked up 71 yards on seven carries in the first half.
The Ravens will receive the ball to begin the second half. The game is being broadcast on CBS.