List of Philadelphia Union seasons

Since its foundation in 2008, the American soccer club Philadelphia Union has played in Major League Soccer. The team has finished as runner-ups thrice in the U.S. Open Cup. The following is a list of seasons completed by the club, inclusive of all competitive competitions.

Key

 * Key to competitions


 * Major League Soccer (MLS) – The top-flight of soccer in the United States, established in 1996.
 * U.S. Open Cup (USOC) – The premier knockout cup competition in U.S. soccer, first contested in 1914.
 * CONCACAF Champions League (CCL) – The premier competition in North American soccer since 1962. It went by the name of Champions' Cup until 2008.


 * Key to colors and symbols:


 * Key to league record
 * Season = The year and article of the season
 * Div = Division/level on pyramid
 * League = League name
 * Pld = Games played
 * W = Games won
 * L = Games lost
 * D = Games drawn
 * GF = Goals for
 * GA = Goals against
 * GD = Goal difference
 * Pts = Points
 * PPG = Points per game
 * Conf. = Conference position
 * Overall = League position


 * Key to cup record
 * DNE = Did not enter
 * DNQ = Did not qualify
 * NH = Competition not held or canceled
 * QR = Qualifying round
 * PR = Preliminary round
 * GS = Group stage
 * R1 = First round
 * R2 = Second round
 * R3 = Third round
 * R4 = Fourth round
 * R5 = Fifth round
 * Ro16 = Round of 16
 * QF = Quarterfinals
 * SF = Semifinals
 * F = Final
 * RU = Runners-up
 * W = Winners

Seasons
1. '''Avg. attendance''' include statistics from league matches only.

2. Top goalscorer(s) includes all goals scored in League, MLS Cup Playoffs, U.S. Open Cup, MLS is Back Tournament, Leagues Cup, CONCACAF Champions League, FIFA Club World Cup, and other competitive continental matches.

3. 2020 MLS Season does not include match data from one-off, in-season MLS is Back Tournament. The Union finished as semi-finalists in that tournament.