| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (new) | ![]() | Deadpool 2 (2018) | £12,974,669 | £12,974,669 | £12,974,669 | new | 1 |
| 2 (1) | ![]() | Avengers: Infinity War (2018) | £2,047,469 | £3,700,666 | £64,054,508 | -64% | 4 |
| 3 (2) | ![]() | Sherlock Gnomes (2018) | £710,170 | £954,240 | £3,476,582 | -72% | 2 |
| 4 (3) | ![]() | I Feel Pretty (2018) | £407,904 | £820,529 | £3,917,749 | -56% | 3 |
| 5 (4) | ![]() | Life of the Party (2018) | £226,704 | £500,886 | £1,119,197 | -63% | 2 |
| 6 (8) | ![]() | Blade Runner (1982) Rerelease | £226,058 | £335,807 | £2,371,450 | -2% | 14 |
| 7 (5) | ![]() | Breaking In (2018) | £160,272 | £350,344 | £775,019 | -62% | 2 |
| 8 (6) | ![]() | A Quiet Place (2018) | £126,334 | £232,852 | £11,634,986 | -65% | 7 |
| 9 (7) | ![]() | The Guernsey Literary and Potato Peel Pie Society (2018) | £94,802 | £324,752 | £5,327,792 | -69% | 5 |
| 10 (re) | An American In Paris: The Musical (2018) | £68,201 | £68,201 | £699,182 | re | 1 | |
| 11 (new) | ![]() | On Chesil Beach (2018) | £67,017 | £67,017 | £67,017 | new | 1 |
| 12 (10) | Raazi (2018) | £62,396 | £113,302 | £263,661 | -59% | 2 | |
| 13 (9) | ![]() | Rampage (2018) | £60,598 | £98,060 | £8,793,782 | -68% | 6 |
| 14 (12) | ![]() | Peter Rabbit (2018) | £50,487 | £62,774 | £40,126,967 | -56% | 10 |
| 15 (13) | ![]() | Tully (2018) | £36,553 | £93,565 | £494,438 | -68% | 3 |