Air carrier first officer reported landing without a clearance; citing fatigue and scarcity of other...

Narrative:

On a visual approach; ATC instructed us to contact tower at the FAF. After touching down; I realized that I didn't contact tower. I quickly swapped to tower and received tower's instructions to taxi to the ramp with him.Threats1. Long duty day (12+ hours)2. Time of the day (X:xx a.m.)3. No other aircraft on frequency; which is unusual. Usually; you are hearing all the other aircraft swapping frequencies. However; this was late at night during covid-19 times with less traffic.4. Previous maintenance issues; flight attendant issues; return to gate event; and aircraft swap; which delayed flight three hours. We could have discussed that we needed to be extra vigilant on arrival and approach due to the long duty day; time of day; and previous maintenance issues. Another possibility is that since no one else was on approach or tower frequency; the tower could have reached out to approach to contact us.

Original NASA ASRS Text

Title: Air carrier First Officer reported landing without a clearance; citing fatigue and scarcity of other aircraft operating due to COVID-19 reductions as contributing.

Narrative: On a visual approach; ATC instructed us to contact Tower at the FAF. After touching down; I realized that I didn't contact Tower. I quickly swapped to Tower and received Tower's instructions to taxi to the ramp with him.Threats1. Long duty day (12+ hours)2. Time of the day (X:XX a.m.)3. No other aircraft on frequency; which is unusual. Usually; you are hearing all the other aircraft swapping frequencies. However; this was late at night during COVID-19 times with less traffic.4. Previous Maintenance issues; Flight Attendant issues; return to gate event; and aircraft swap; which delayed flight three hours. We could have discussed that we needed to be extra vigilant on arrival and approach due to the long duty day; time of day; and previous Maintenance issues. Another possibility is that since no one else was on Approach or Tower frequency; the Tower could have reached out to Approach to contact us.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1751324
Time
Date	202007
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Landing Without Clearance Deviation - Procedural Published Material / Policy

Air carrier first officer reported landing without a clearance; citing fatigue and scarcity of other aircraft operating due to covid-19 reductions as contributing.