GREATEST HITS by WESTLIFE has sold 647,449 copies in Ireland, Korea and United Kingdom.
GREATEST HITS certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Ireland |
45,000 | 3x Platinum | 2011 |
Ireland Sales: 45,000
Certification / note: 3x Platinum
Certification Date / sales as of: 2011
|
 Korea |
2,449 | RIAK / Gaon charts |
Korea Sales: 2,449
Certification / note: RIAK / Gaon charts
Certification Date / sales as of:
|
|
 United Kingdom |
600,000 | 2x Platinum | 30 December, 2016 |
United Kingdom Sales: 600,000
Certification / note: 2x Platinum
Certification Date / sales as of: 30 December, 2016
|
| Total sales | 647,449 | (in 3 countries) |
Total
Sales: 647,449
(in 3 countries)
|
Year-end chart performance for GREATEST HITS
| Chart 2011 | Rank | Sales |
| Irish Albums (IRMA) |
9 | |
| South Korean International Albums (Gaon) |
70 | 2,449 |
| UK Albums (Charts Plus) |
19 | |
| Chart 2012 | Rank | Sales |
| UK Albums (Charts Plus) |
143 | |
| Chart 2019 | Rank | Sales |
| Irish Albums (IRMA) |
35 |
Decade-end chart performance for GREATEST HITS
| Chart 2010's | Rank |
| UK Albums (Official Charts) |
97 |