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Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (Nos. 333-291702, 333-266515, and 333-199734) on Form S-8 and registration statement (No. 333-282349) on Form S-3 of our reports dated February 26, 2026, with respect to the consolidated financial statements of Allegiant Travel Company and subsidiaries and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Dallas, Texas

February 26, 2026