The following is the 1998 D.C. United schedule. Please note that all times listed are eastern and everything is subject to change.
| Date | Opponent | Kickoff |
| March 15 | at Miami | 4:00 p.m. |
| March 21 | Kansas City | 8:00 p.m. |
| March 29 | New England | 5:00 p.m. |
| April 4 | at Columbus | 7:30 p.m. |
| April 11 | Colorado | 7:30 p.m. |
| April 18 | at New England | 3:00 p.m. |
| April 26 | Columbus | 3:00 p.m. |
| April 29 | San Jose | 7:30 p.m. |
| May 2 | at Chicago | 8:00 p.m. |
| May 9 | MetroStars | 7:30 p.m. |
| May 13 | New England | 7:30 p.m. |
| May 16 | at MetroStars | 1:00 p.m. |
| May 23 | Tampa Bay | 7:30 p.m. |
| May 30 | at Tampa Bay | 7:30 p.m. |
| June 3 | at San Jose | 10:30 p.m. |
| June 7 | Dallas | 3:00 p.m. |
| June 13 | at Columbus | 7:30 p.m. |
| June 20 | at Kansas City | 8:30 p.m. |
| June 25 | at Colorado | 9:00 p.m. |
| July 2 | Miami | 7:30 p.m. |
| July 11 | Los Angeles | 7:30 p.m. |
| July 15 | at New England | 7:30 p.m. |
| July 18 | Chicago | 3:00 p.m. |
| July 25 | at Los Angeles | 10:30 p.m. |
| July 29 | Tampa Bay | 7:30 p.m. |
| Aug. 7 | at Dallas | 8:30 p.m. |
| Aug. 23 | MetroStars | 5:00 p.m. |
| Aug. 29 | at Tampa Bay | 7:30 p.m. |
| Sept. 13 | at Miami | 1:00 p.m. |
| Sept. 16 | at MetroStars | 7:30 p.m. |
| Sept. 19 | Miami | 7:30 p.m. |
| Sept. 27 | Columbus | 5:00 p.m. |