Six operators are offering direct passenger services from five ports in Ireland to nine ports in Britain.
Additional sailings have also been scheduled to run between Cork and Swansea in Wales.
Three operators are providing direct passenger services between Ireland and France, with seven sailings per week to Cherbourg and Roscoff in Brittany.
Irish Ferries has revised its website design and introduced a more simplified layout that will make it easier and faster to make reservations on-line.
"The change has been made in light of the unprecedented demand which led to some delays previously."
Ireland - UK Passenger Ferry Routes
Belfast - Stranraer
Stenaline
Irl: 01 2047777
UK: 0044 8447707070
Belfast - Liverpool (Birkenhead)
Norfolkline Irish Sea Ferries
Irl: 01 8192999
UK: 0044 844 499 0007
Larne - Troon
P&O Ferries
Irl: 01 407 3434
UK: 0871 66 44 999
Larne - Cairnryan
P&O Ferries
Irl: 01 407 3434
UK: 0871 66 44 999
Larne - Fleetwood
Stenaline
Irl: 01 2047777
UK: 0044 8447707070
Dublin - Holyhead
Irish Ferries:
From Ireland: 0818 300 400
From UK: 08717 300 400
Stenaline:
Irl: 01 2047777
UK: 0044 8447707070
Dublin - Liverpool (Birkenhead)
Norfolkline Irish Sea Ferries
Irl: 01 8192999
UK: 0044 844 499 0007
P&O Ferries
Irl: 01 407 3434
UK: 0871 66 44 999
Dublin/Belfast - Douglas
Isle of Man Steam Packet Co,
UK: 00 44 1624 645620
Dun Laoghaire - Holyhead
Stenaline
Irl: 01 2047777
UK: 0044 8447707070
Rosslare - Pembroke
Irish Ferries
From Ireland: 0818 300 400
From UK: 08717 300 400
Rosslare - Fishguard
Stenaline
Irl: 01 2047777
UK: 0044 8447707070
Cork - Swansea
Fastnet Line
Irl: 353 (0) 21 4378892
UK: 0044 1792344577
Passenger Ferry Routes, Ireland - France
Rosslare - Cherbourg
Irish Ferries:
From Ireland: 0818 300 400
From UK: 08717 300 400
From France: +33 1 70 72 03 26
Celtic Link:
Irl: 053 916 2688
Cork - Cherbourg/ Roscoff
Brittany Ferries
Irl: 021 4277801
RYANAIR
Reservations centres:
Lines open from 7am-8pm (GMT) on +44 871 246 0000 AND +353 818 30 30 30
AER LINGUS
From Ireland: 0818 365000
From Northern Ireland/Britain: 0871 718 5000
Website helpdesk: for help and changes to aerlingus.com bookings
Ireland: 0818 365044
Northern Ireland/UK: 0871 718 2020
AER FRANCE: 01 605 0383
DELTA (Ireland): 01-4073165
EUROLINES (London): (01582) 404511 or National Express at (0990) 808080
(national call rate. Eurolines credit card reservations (London): (0171) 730 8235
BUS ÉIREANN:
Bus Eireann, in conjunction with Stena Line and Irish Ferries, has put in place additional coaches for the following services to the UK for the rest of the week while disruption to air traffic remains:
7.30pm Eurolines Dublin (Busáras) – Birmingham/London (city centre)
7.15pm Eurolines Dublin-Liverpool-Manchester-Leeds
4pm Eurolines Cork/Waterford-London (city centre)
Eurolines services to London can be used to connect with Eurolines services across Europe.
www.buseireann.ie