The decision was made by the medical groups of the NHL, NHL Players' Association, Flyers and Capitals out of an abundance of caution while the NHL continues to analyze test results in the coming days.
Forward Claude Giroux and defenseman Justin Braun were placed on the NHL COVID-19 protocol list Tuesday.
Defenseman Travis Sanheim had been placed on the COVID-19 protocol list Sunday, prior to a 7-4 win at Washington. Medical experts from the NHL and NHLPA required all Flyers players, coaches and staff members to receive POC tests before the game. All tests returned negative, and the game was allowed to be played.
A makeup date for the game will be announced.
The Flyers are next scheduled to play at the New York Rangers on Sunday with games at the New Jersey Devils scheduled for Thursday and Saturday previously postponed.
The Capitals visit the Pittsburgh Penguins on Sunday. Washington's games at the Buffalo Sabres on Thursday and Saturday were previously postponed.
The NHL has postponed 32 games during the 2020-21 season. Two were postponed prior to its start.
The St. Louis Blues will play at the Arizona Coyotes on Friday at 9 p.m. ET, a game rescueduled from April 15. Their game Saturday was moved from 7 p.m. ET to 8 p.m. ET.
