| Airline | Image | IATA | ICAO | Callsign | Commenced
operations | Ceased
operations | Notes |
| AB Shannon | | 7L | AZX | | 1995 | 1996 | Branch of AB Airlines |
| Aer Arann | | RE | REA | AER ARANN | 1970 | 2011 | Rebranded as Stobart Air |
| Aer Arann Regional | | RE | REA | | 2011 | 2014 | Established as Aer Arann |
| Aer Leisure | | | | | 1999 | 2000 | Operated Boeing 737 |
| Aer Lingus Commuter | | EI | EIN | | 1984 | 1998 | Merged into Aer Lingus |
| Aer Turas | | QT | ATT | QUEBEC TANGO | 1962 | 2003 | |
| Aerlinte Eireann | | IN | | | 1947 | 1970 | Merged with Aer Lingus. Operated Lockheed L-749 Constellation |
| Air Contractors | | AG | ABR | | 1998 | 2015 | Rebranded ASL Airlines Ireland. Operated ATR 72 |
| Avair | | | | | 1978 | 1982 | |
| Aviajet | | | | | 1983 | 2008 | Virtual airline |
| Business City Direct | | | | | 1992 | 1993 | Founded by Patrick Byrne. Rebranded CityJet |
| Capel Air | | | | | 1971 | 1980 | Alias Reindeer Travel |
| Clyden Airways | | | | | 1978 | 1981 | Operated Douglas DC-3 |
| Cork Air Carriers | | | | | 1971 | 1974 | Operated Douglas DC-3 |
| EI-Air Exports | | | EIX | | 1991 | 1995 | Renamed/merged to Ireland Airways |
| Eirjet | | | EIR | EIRJET | 2004 | 2006 | |
| EU Airways | | VE | EUY | EUROAIRWAYS | ? | ? | |
| EUjet | | VE | EUY | UNION JET | 2003 | 2006 | |
| Euroceltic Airways | | 5Q | | WEXFORD | 1999 | 2001 | |
| FlyU | | | | | 2006 | 2008 | Rebranded as Nex Aviation |
| Futura Gael | | F0 | FGL | APPLEWOOD | 2007 | 2008 | |
| Hibernian Airlines | | | | | 1966 | 1967 | Alias Air Charters of Ireland. Acquired by Emerald Airways (Belfast). Operated Douglas C-47B |
| Hunting Cargo Airlines | | AG | ABR | | 1993 | 1998 | Renamed/merged to Air Contractors |
| Interconair | | | | | 1976 | 1977 | Alias Intercon Air Ireland. Operated Bristol Britannia, Boeing 707-400 |
| Iona National Airways | | | | | 1931 | 1994 | |
| Ireland Airways | | 2E | EIX | AIR EXPORTS | 1991 | 1998 | Alias El Air Exports. Operated BAe ATP, FH-227, Short 330, Short 360 |
| Ireland West Airways | | | | | 1968 | 1971 | Operated Piper Aztec, Piper Cherokee Six |
| Irish Air Transport | | | RDK | IRISH TRANS | 1993 | 1993 | Operated Learjet 60, Short 360 |
| JetGreen Airways | | | | | 2004 | 2004 | |
| Jetmagic | | GX | JMG | JETMAGIC | 2003 | 2004 | |
| Kerry Airways | | | | | 1970 | 1977 | Third Level Carrier |
| MyWay | | | | | 2004 | 2004 | Operated Airbus A320-200 |
| Nex Aviation | | | | | 2006 | 2009 | Rebranded from FlyU |
| Norwegian Air International | | D8 | IBK | NORTRANS | 2014 | 2021 | |
| Omega Airlines | | | | | 1996 | 2000 | |
| Shannon Air | | | | | 1964 | 1966 | Operated Douglas DC-4, Douglas DC-7 |
| Shannon Executive Aviation | | | SXA | SHANNONN EXEC | 1983 | 1990 | Operated Bell 222, Cessna 411, Piper PA-23, Swearingen Merlin |
| Skynet Airlines | | SI | SIH | BLUEJET | 2001 | 2004 | |
| Sonas Aviation | | | SON | SONAS | 2020 | 2020 | Renamed to ACASS Ireland. Operated Canadair Challenger 600 |
| Stobart Air | | RE | STK | STOBART | 2014 | 2021 | |
| TransAer International Airlines | | T8 | TLA | TRANSLIFT | 1997 | 2000 | Rebranded from Translift Airways |
| Translift Airways | | T8 | TLA | TRANSLIFT | 1991 | 1997 | Rebranded as TransAer International Airlines |
| Virgin Express Ireland | | VK | VEI | GREENISLE | 1998 | 2001 | |
| XL Airways Ireland | | | | | 2007 | 2008 | |