Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Communication Breakdown; Situational Awareness
Deviation / Discrepancy - Procedural Landing Without Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification
Environment - Non Weather Related; Human Factors; Procedure
Short turn on to final just inside ZZZZZ Intersection.  One dot high.  I was task saturated configuring from 210 to 170 knots and getting on glideslope.  I tuned out ATC while configuring and didn't catch that we hadn't switched over to Tower for a landing clearance.  Captain was busy as well assisting me in configuring and missed the frequency switch to Tower.  After landing we noticed we were still on approach frequency.Although I lost listening focus on ATC communications during configuring; from FAF to touchdown it was pretty quiet and mellow.  If I had refocused on listening to ATC chatter; I would have easily noticed we were still on approach.
Short approach to Runway XX; slightly high and slowing to 170. On glideslope by ZZZZZ Intersection.  FO leg; he configured quickly and slowed from 170 assigned to approach speed as we approached ZZZZZ Intersection; then dropped the nose to get rid of the 1 dot high glideslope.  On glideslope shortly after ZZZZZ1 Intersection; transitioned to normal descent rate and speed.  Landed uneventfully.  On rollout; not hearing any instructions from the Tower; I looked at the radios and saw that I had never switched over to Tower and gotten a landing clearance.  Switched over as I turned off the high speed; called Tower; they replied 'There you are Aircraft X; we've been looking for you;' then gave me taxi instructions.  Cross Runway XY; contact Ground and given instructions to taxi to our gate.  No further contact from either Tower or Ground.Both CA and FO have had extended periods of time off; the latest being about X weeks (FO flew yesterday after a [X] week break).  Before that; with all the cancellations in [month]; flying was spotty; CA flew [X] trips in the [X] weeks before the latest [X] week break. Both of us were aware of the situation; but we got caught short with a short approach; trying to configure; finish the checklist; and get back on the glideslope when the time came to flip the switch to talk to Tower and get a landing clearance.Don't let obvious distractions at important points of the flight divert you from required frequency changes or procedures; especially if you know you haven't been in the game much lately.
Air carrier flight crew reported landing without a clearance. The Captain made reference to lack of flying time in recent weeks as a contributing factor.