There were 18 more Covid-19 fatalities and 2,437 new cases registered during the previous 24 hours, the Public Health Ministry said on Monday morning.
There were 2,419 cases in the general population and 18 among prison inmates.
This compared with 22 coronavirus-related fatalities and 2,532 new cases reported on Sunday morning.
On Sunday, 3,845 Covid-19 patients were discharged from hospitals after recovering from the coronavirus.
Since the pandemic started early last year, there have been 2,212,407 Covid-19 cases, with 2,156,373 complete recoveries so far.
The vast majority of the Covid cases and deaths have occurred since April 1, around when the third wave of Covid-19 began.
The death toll stood at 21,504 during the third wave and 21,598 since the beginning of the pandemic.
The kingdom's 24-hour high of Covid-19 fatalities was 312 recorded on Aug 13. The highest number of cases was 23,418 on Aug 13.
Apisamai Srirangson, a spokeswoman for the Centre for Covid-19 Situation Administration, said in the afternoon briefing that the latest 18 fatalities were aged 49 to 96 years.
Bangkok logged one more death while other central plain provinces further from the capital recorded three - in Kanchanaburi (1), Prachin Buri (1) and Suphan Buri (1).
The Northeast had three more fatalities - in Khon Kaen (1), Nakhon Ratchasima (1) and Ubon Ratchathani (1).
The South reported five more deaths - Trang (1), Satun (2), Phatthalung (1), and Songkhla (1).
The North saw six new fatalities - in Chiang Mai (3), Lampang (2) and Tak (1).
The 2,437 new cases included 2,327 local infections and 92 imported cases. Of the local Covid-19 infections, 2,307 were confirmed at hospitals and 20 via mass testing.
Bangkok had 427 new cases, followed by 150 in in Nakhon Si Thammarat, 138 in Chon Bri, 96 in Khon Kaen, 88 in Samut Prakan, 57 in Chiang Mai, 56 in Trang, 54 in Chachoengsao, 53 in Songkhla and 52 in Surat Thani.
The 92 imported cases were from the United Arab Emirates (9), the Netherlands (3), Denmark (3), Sweden (9), Cameroon (1), the United Kingdom (19), the Philippines (3), Kazakhstan (3), Switzerland (2), the United States (10), Brazil (1), Russia (5), France (6), Sri Lanka (1), Spain (1), Belgium (1), Bangladesh (1), Austria (1), Finland (2), Pakistan (1), Qatar (1), Czech (1), Australia (1), Estonia (1), Ukraine (1), Turkey (1), Vietnam (1), Tanzania (1), Germany (1) and Malaysia (1).
On Sunday 34,436 people received Covid-19 treatment at hospitals, including 752 seriously ill patients and 179 dependent on ventilators.
Global Covid-19 cases rose by 381,215 in 24 hours to 280.33 million. The worldwide death toll went up by 2,985 to 5.41 million. The US had the most cases at 53.22 million, up 96,384, and the most deaths at 837,854, up 52.