On Tuesday 10 August, the 2021 Jersey Flegg Cup season was cancelled after 15 rounds played due to a COVID-19 outbreak in the Greater Sydney region. The season was originally suspended in early July for five rounds before its full cancellation.

Round 1
13 Mar Victoria 18 – 28 Canterbury Gosch’s View
13 Mar St George Illawarra 10 – 4 Cronulla Collegians View
13 Mar Penrith 24 – 16 South Sydney BlueBet View
14 Mar Manly 12 – 24 Sydney HE Laybutt View
Parramatta BYE
Wests Tigers BYE
Round 2
21 Mar Cronulla 18 – 10 Victoria Netstrata Jubilee View
27 Mar Canterbury 4 – 50 Penrith Belmore View
14 May Wests Tigers 18 – 18 Sydney Leichhardt View
15 May Parramatta 12 – 32 St George Illawarra Ringrose View
12 Jun South Sydney 4 – 10 Manly Stadium Australia View
Round 3
27 Mar Victoria 12 – 50 Wests Tigers Casey View
27 Mar Manly 20 – 28 St George Illawarra Lottoland View
27 Mar South Sydney 30 – 16 Sydney Ironmark HPC View
27 Mar Parramatta 18 – 26 Cronulla McCredie View
Canterbury BYE
Penrith BYE
Round 4
2 Apr Cronulla 20 – 10 Sydney PointsBet View
2 Apr Canterbury 24 – 25 South Sydney Stadium Australia View
3 Apr Manly 20 – 26 Penrith Lottoland View
3 Apr Victoria 12 – 32 St George Illawarra Casey View
5 Apr Wests Tigers 40 – 22 Parramatta Campbelltown View
Round 5
10 Apr Manly 30 – 25 Victoria Lottoland View
11 Apr Wests Tigers 24 – 24 Canterbury Leichhardt View
11 Apr Parramatta 24 – 10 Sydney Bankwest View
Cronulla BYE
Penrith BYE
South Sydney BYE
St George Illawarra BYE
Round 6
17 Apr Penrith 22 – 23 St George Illawarra BlueBet View
17 Apr Canterbury 40 – 16 Sydney Belmore View
17 Apr Manly 28 – 14 Parramatta Lottoland View
17 Apr South Sydney 24 – 28 Wests Tigers Stadium Australia View
18 Apr Victoria 18 – 18 Cronulla Haines Drive View
Round 7
24 Apr Parramatta 48 – 12 South Sydney Ringrose View
24 Apr Penrith 40 – 20 Victoria BlueBet View
24 Apr Cronulla 12 – 28 Canterbury Netstrata Jubilee View
25 Apr Wests Tigers 26 – 18 Manly TG Millner View
25 Apr Sydney 42 – 18 St George Illawarra Waverley View
Round 8
1 May Cronulla 30 – 14 South Sydney PointsBet View
1 May Canterbury 8 – 12 Parramatta Stadium Australia View
2 May St George Illawarra 10 – 32 Wests Tigers Ziems View
2 May Penrith 40 – 6 Manly St Marys View
2 May Victoria 36 – 28 Sydney Clearwood Drive View
Round 9
8 May Penrith 20 – 20 Cronulla BlueBet View
8 May South Sydney 30 – 14 Manly Ironmark HPC View
8 May Canterbury 22 – 28 St George Illawarra Belmore View
8 May Parramatta 20 – 28 Sydney Ringrose View
Victoria BYE
Wests Tigers BYE
Round 10
All teams BYE
Round 11
21 May Cronulla 18 – 24 St George Illawarra Netstrata Jubilee View
22 May South Sydney 42 – 14 Penrith Ironmark HPC View
22 May Wests Tigers 24 – 24 Victoria Lidcombe View
22 May Sydney 14 – 42 Canterbury Mascot View
Manly BYE
Parramatta BYE
Round 12
29 May Penrith 12 – 22 Canterbury BlueBet View
29 May South Sydney 24 – 18 Parramatta Stadium Australia View
29 May Wests Tigers 30 – 10 St George Illawarra Lidcombe View
30 May Sydney 26 – 24 Cronulla Waverley View
Cancelled Victoria 20 – 20 Manly Clearwood Drive View
Round 13
5 Jun Canterbury 24 – 14 Cronulla Belmore View
5 Jun South Sydney 16 – 18 St George Illawarra Ironmark HPC View
5 Jun Wests Tigers 32 – 18 Penrith Lidcombe View
6 Jun Sydney 54 – 10 Manly Waverley View
Cancelled Victoria 19 – 19 Parramatta AAMI View
Round 14
11 Jun Cronulla 10 – 17 Penrith Netstrata Jubilee View
12 Jun Parramatta 14 – 30 Wests Tigers Merrylands View
12 Jun St George Illawarra 20 – 18 Canterbury Ziems View
Cancelled South Sydney 20 – 20 Victoria Metricon HPC View
Manly BYE
Sydney BYE
Round 15
18 Jun Penrith 22 – 22 Sydney BlueBet View
19 Jun Parramatta 16 – 32 Canterbury New Era View
19 Jun Manly 16 – 18 Cronulla 4 Pines View
Cancelled Victoria 25 – 25 Wests Tigers Gosch’s View
South Sydney BYE
St George Illawarra BYE
Round 16*
Cancelled Penrith 0 – 0 Parramatta BlueBet
Cancelled Canterbury 0 – 0 Manly Belmore
Cancelled St George Illawarra 0 – 0 Victoria WIN
Cancelled Wests Tigers 0 – 0 South Sydney Leichhardt
Cronulla BYE
Sydney BYE
Round 17*
Cancelled Canterbury 0 – 0 Parramatta Belmore
Cancelled South Sydney 0 – 0 Cronulla Ironmark HPC
Cancelled St George Illawarra 0 – 0 Manly Collegians
Cancelled Victoria 0 – 0 Penrith Clearwood Drive
Cancelled Sydney 0 – 0 Wests Tigers Waverley
Round 18*
Cancelled St George Illawarra 0 – 0 Penrith Collegians
Cancelled Manly 0 – 0 Wests Tigers HE Laybutt
Cancelled Sydney 0 – 0 Victoria Waverley
Cancelled Cronulla 0 – 0 Parramatta PointsBet
Cancelled South Sydney 0 – 0 Canterbury Stadium Australia
Round 19*
Cancelled Cronulla 0 – 0 Wests Tigers Henson
Cancelled Manly 0 – 0 Canterbury 4 Pines
Cancelled Penrith 0 – 0 Parramatta BlueBet
Cancelled St George Illawarra 0 – 0 Sydney Netstrata Jubilee
Cancelled Victoria 0 – 0 South Sydney Haines Drive
Round 20
All teams BYE
Round 21*
Cancelled Canterbury 0 – 0 Wests Tigers Belmore
Cancelled Cronulla 0 – 0 South Sydney Henson
Cancelled Sydney 0 – 0 Penrith Waverley
Cancelled Parramatta 0 – 0 Victoria Ringrose
Cancelled Manly 0 – 0 St George Illawarra 4 Pines

*Before the season was cancelled, Rounds 16 to 21 were awarded as draws and each team received one competition point.