Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Sep. 30, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-34584
Entity Registrant Name	HARBOR DIVERSIFIED, INC.
Entity Incorporation State Country Code	DE
Entity Tax Identification Number	13-3697002
Entity Address Address Line1	W6390 Challenger Drive
Entity Address Address Line2	Suite 203
Entity Address City Or Town	Appleton
Entity Address State Or Province	WI
Entity Address Postal Zip Code	54914-9120
City Area Code	920
Local Phone Number	749-4188
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	No
Entity Interactive Data Current	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 53.4
Entity Common Stock, Shares Outstanding		58,534,309
Entity Central Index Key	0000899394
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY