Westminster Voting Intention
| End Date | Company | Client | CON | LAB | LD | GRN | UKIP | Lead |
| 12 Oct 2018 | Opinium Online | Observer | 41 | 37 | 8 | 3 | 6 | +4 |
| 09 Oct 2018 | YouGov Online | Times | 41 | 37 | 9 | 3 | 4 | +4 |
| 05 Oct 2018 | Opinium Online | Observer | 39 | 39 | 7 | 3 | 6 | Tie |
| 05 Oct 2018 | BMG Online | Independent | 38 | 39 | 10 | 4 | 4 | +1 |
| 01 Oct 2018 | YouGov Online | Times | 42 | 36 | 9 | 2 | 5 | +6 |
| 29 Sep 2018 | BMG Online | HuffPost | 35 | 40 | 12 | 3 | 5 | +5 |
| 28 Sep 2018 | Opinium Online | Observer | 39 | 36 | 9 | 3 | 6 | +3 |
| 27 Sep 2018 | ComRes Online | Express | 39 | 40 | 9 | 2 | 5 | +1 |
| 25 Sep 2018 | YouGov Online | Times | 42 | 36 | 11 | 2 | 4 | +6 |
| 24 Sep 2018 | ICM Online | Guardian | 41 | 40 | 9 | 3 | 4 | +1 |
| 22 Sep 2018 | BMG Online | HuffPost | 38 | 38 | 10 | 4 | 5 | Tie |
| 20 Sep 2018 | Opinium Online | 37 | 39 | 9 | 2 | 8 | +2 | |
| 19 Sep 2018 | YouGov Online | Times | 40 | 36 | 11 | 2 | 5 | +4 |
| 18 Sep 2018 | Ipsos MORI Phone | Evening Standard | 39 | 37 | 13 | 5 | 2 | +2 |
| 13 Sep 2018 | YouGov Online | Times | 40 | 36 | 11 | 3 | 4 | +4 |
| 13 Sep 2018 | Opinium Online | 39 | 38 | 7 | 3 | 6 | +1 | |
| 10 Sep 2018 | Kantar Public Online | 40 | 35 | 10 | 4 | 5 | +5 | |
| 09 Sep 2018 | ICM Online | Guardian | 42 | 39 | 8 | 3 | 4 | +3 |
| 07 Sep 2018 | Survation Online | Daily Mail | 38 | 37 | 10 | 1 | 4 | +1 |
| 07 Sep 2018 | BMG Online | Independent | 37 | 38 | 11 | 4 | 7 | +1 |
| 04 Sep 2018 | YouGov Online | Times | 39 | 35 | 11 | 4 | 5 | +4 |
| 01 Sep 2018 | Survation Online | 37 | 41 | 6 | 2 | 7 | +4 | |
| 29 Aug 2018 | YouGov Online | Times | 39 | 37 | 10 | 3 | 5 | +2 |
| 21 Aug 2018 | YouGov Online | Times | 40 | 37 | 9 | 2 | 6 | +3 |
| 19 Aug 2018 | ICM Online | Guardian | 40 | 40 | 8 | 2 | 6 | Tie |
| 17 Aug 2018 | Opinium Online | 39 | 38 | 7 | 3 | 7 | +1 | |
| 16 Aug 2018 | Deltapoll Online | Sun on Sunday | 37 | 40 | 8 | 5 | 6 | +3 |
| 14 Aug 2018 | YouGov Online | 41 | 38 | 8 | 3 | 6 | +3 | |
| 13 Aug 2018 | Number Cruncher Politics Online | 38 | 40 | 8 | 2 | 5 | +2 | |
| 13 Aug 2018 | Kantar Public Online | 40 | 39 | 9 | 3 | 4 | +1 | |
| 10 Aug 2018 | BMG Online | Independent | 37 | 39 | 10 | 5 | 5 | +2 |
| 09 Aug 2018 | YouGov Online | Times | 39 | 35 | 10 | 3 | 7 | +4 |
| 05 Aug 2018 | ICM Online | 39 | 40 | 7 | 3 | 6 | +1 | |
| 31 Jul 2018 | YouGov Online | Times | 38 | 38 | 10 | 3 | 6 | Tie |
| 24 Jul 2018 | Ipsos MORI Phone | 38 | 38 | 10 | 3 | 6 | Tie | |
| 23 Jul 2018 | YouGov Online | Times | 38 | 38 | 10 | 3 | 6 | Tie |
| 22 Jul 2018 | ICM Online | Guardian | 40 | 41 | 8 | 3 | 5 | +1 |
| 20 Jul 2018 | YouGov Online | Sunday Times | 38 | 39 | 9 | 2 | 6 | +1 |
| 17 Jul 2018 | YouGov Online | Times | 36 | 41 | 9 | 2 | 7 | +5 |
| 14 Jul 2018 | Deltapoll Online | Sun on Sunday | 37 | 42 | 7 | 3 | 6 | +5 |
| 13 Jul 2018 | Opinium Online | Observer | 36 | 40 | 8 | 3 | 8 | +4 |
| 11 Jul 2018 | YouGov Online | Times | 37 | 39 | 10 | 3 | 6 | +2 |
| 09 Jul 2018 | Kantar TNS Online | 40 | 38 | 9 | 3 | 3 | +2 | |
| 09 Jul 2018 | ICM Online | Guardian | 41 | 39 | 9 | 3 | 4 | +2 |
| 09 Jul 2018 | YouGov Online | Times | 39 | 39 | 9 | 3 | 5 | Tie |
| 07 Jul 2018 | Survation Online | Mail on Sunday | 38 | 40 | 10 | 2 | 3 | +2 |
| 05 Jul 2018 | BMG Online | 39 | 37 | 10 | 4 | 3 | +2 | |
| 04 Jul 2018 | YouGov Online | Times | 41 | 40 | 9 | 2 | 3 | +1 |
| 27 Jun 2018 | Ipsos MORI Phone | 41 | 38 | 7 | 4 | 4 | +3 | |
| 26 Jun 2018 | YouGov Online | Times | 42 | 37 | 9 | 3 | 3 | +5 |
| 24 Jun 2018 | ICM Online | Guardian | 41 | 40 | 9 | 3 | 3 | +1 |
| 20 Jun 2018 | Survation Online | Good Morning Britain | 41 | 38 | 7 | 3 | 3 | +3 |
| 19 Jun 2018 | YouGov Online | Times | 42 | 40 | 9 | 2 | 3 | +2 |
| 12 Jun 2018 | YouGov Online | Times | 42 | 39 | 8 | 2 | 3 | +3 |
| 10 Jun 2018 | ICM Online | Guardian | 42 | 40 | 8 | 3 | 3 | +2 |
| 08 Jun 2018 | BMG Online | Independent | 38 | 41 | 11 | 2 | 4 | +3 |
| 07 Jun 2018 | Opinium Online | Observer | 42 | 40 | 7 | 2 | 3 | +2 |
| 05 Jun 2018 | YouGov Online | Times | 44 | 37 | 8 | 3 | 3 | +7 |
| 04 Jun 2018 | Survation Online | 41 | 40 | 9 | 2 | 2 | +1 | |
| 29 May 2018 | ICM Online | Guardian | 43 | 40 | 8 | 2 | 3 | +3 |
| 29 May 2018 | YouGov Online | Times | 42 | 39 | 9 | 2 | 3 | +3 |
| 22 May 2018 | Ipsos MORI Phone | 40 | 40 | 7 | 5 | 2 | Tie | |
| 21 May 2018 | YouGov Online | Times | 42 | 38 | 9 | 3 | 2 | +4 |
| 17 May 2018 | ComRes Online | Daily Mail | 41 | 41 | 7 | 3 | 3 | Tie |
| 16 May 2018 | Opinium Online | Observer | 43 | 39 | 6 | 3 | 4 | +4 |
| 13 May 2018 | ICM Online | Guardian | 43 | 40 | 8 | 3 | 3 | +3 |
| 10 May 2018 | Survation Online | 41 | 40 | 8 | 2 | 3 | +1 | |
| 09 May 2018 | YouGov Online | Times | 43 | 38 | 9 | 2 | 2 | +5 |
| 04 May 2018 | YouGov Online | Times | 43 | 38 | 9 | 3 | 3 | +5 |
| 04 May 2018 | BMG Online | 39 | 39 | 10 | 3 | 4 | Tie | |
| 01 May 2018 | YouGov Online | Times | 42 | 38 | 7 | 3 | 3 | +4 |
| 29 Apr 2018 | ComRes Online | Express | 40 | 40 | 9 | 3 | 5 | Tie |
| 29 Apr 2018 | ICM Online | Guardian | 42 | 39 | 8 | 3 | 4 | +3 |
| 25 Apr 2018 | YouGov Online | Times | 43 | 38 | 8 | 3 | 3 | +5 |
| 24 Apr 2018 | Ipsos MORI Phone | Evening Standard | 41 | 40 | 10 | 2 | 2 | +1 |
| 17 Apr 2018 | YouGov Online | Times | 43 | 38 | 8 | 3 | 3 | +5 |
| 14 Apr 2018 | Survation Online | Mail on Sunday | 40 | 40 | 9 | 1 | 3 | Tie |
| 13 Apr 2018 | BMG Online | 39 | 38 | 11 | 4 | 3 | +1 | |
| 12 Apr 2018 | Opinium Online | Observer | 40 | 40 | 7 | 2 | 5 | Tie |
| 12 Apr 2018 | ComRes Online | Sunday Express | 40 | 41 | 7 | 2 | 4 | +1 |
| 10 Apr 2018 | YouGov Online | Times | 40 | 40 | 9 | 2 | 4 | Tie |
| 08 Apr 2018 | ICM Online | Guardian | 42 | 41 | 7 | 3 | 4 | +1 |
| 05 Apr 2018 | Number Cruncher Politics Online | 43 | 38 | 8 | 3 | 3 | +5 | |
| 05 Apr 2018 | YouGov Online | Times | 42 | 41 | 7 | 2 | 4 | +1 |
| 27 Mar 2018 | YouGov Online | Times | 43 | 39 | 8 | 2 | 3 | +4 |
| 18 Mar 2018 | ICM Online | Guardian | 44 | 41 | 8 | 2 | 1 | +3 |
| 15 Mar 2018 | YouGov Online | Times | 42 | 39 | 7 | 3 | 3 | +3 |
| 15 Mar 2018 | Opinium Online | Observer | 42 | 40 | 6 | 3 | 4 | +2 |
| 08 Mar 2018 | Survation Online | GMB | 37 | 44 | 9 | 2 | 3 | +7 |
| 07 Mar 2018 | Ipsos MORI Phone | 43 | 42 | 6 | 2 | 2 | +1 | |
| 06 Mar 2018 | YouGov Online | Times | 41 | 43 | 7 | 2 | 2 | +2 |
| 04 Mar 2018 | ICM Online | Guardian | 43 | 42 | 7 | 3 | 2 | +1 |
| 27 Feb 2018 | YouGov Online | Times | 41 | 42 | 7 | 2 | 3 | +1 |
| 20 Feb 2018 | YouGov Online | Times | 40 | 42 | 8 | 2 | 4 | +2 |
| 19 Feb 2018 | ICM Online | Guardian | 42 | 43 | 7 | 2 | 3 | +1 |
| 13 Feb 2018 | YouGov Online | Times | 40 | 41 | 8 | 2 | 4 | +1 |
| 12 Feb 2018 | Kantar Public Online | 39 | 39 | 8 | 2 | 4 | Tie | |
| 09 Feb 2018 | BMG Online | 40 | 40 | 8 | 4 | 5 | Tie | |
| 08 Feb 2018 | Opinium Online | Observer | 42 | 39 | 7 | 5 | +3 | |
| 06 Feb 2018 | YouGov Online | Times | 43 | 39 | 8 | 3 | 3 | +4 |