EXHIBIT 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 7, 2005 (which report expresses an unqualified opinion and includes an explanatory paragraph relating to the adoption of Statement of Financial Accounting Standards No. 142, Goodwill and Other Intangible Assets), relating to the financial statements and financial statement schedule of Alaska Communications Systems Group, Inc., appearing in the Annual Report on Form 10-K of Alaska Communications Systems Group, Inc. for the year ended December 31, 2004. DELOITTE & TOUCHE LLP Portland, Oregon April 11, 2005