到着予定時刻（とうちゃくよていじこく、英: estimated time of arrival, ETA, ETOA）は、船舶、車両、航空機、貨物、緊急車両[1][2]、が目的地に到達する予定時刻。特に公共交通機関で使うことが多く、電車、バス、航空機等の動きを基に、所定の時刻表から割り出したり、最新の交通量から逐次概算してゆく[要出典]。交通機関の場合、対義語に当たる「出発予定時刻（estimated time of departure, ETD）」と対にして用いることが多い[要出典]。
US patent 2646924, Oscar Hugo Schuck, "Computer for estimated time of arrival", issued 1948-11-29
US patent 3443073, Richard L. Cohen, "Groundspeed and estimated time of arrival computer", issued 1969-05-06
US patent 3619579, Earl Stuart Perkins, "Time of arrival and ground speed computer", issued 1971-10-28
US patent 4012900, Wayne Jay Enright, "Setting means for estimated time of arrival clock hands", issued 1977-03-22
US patent 4153874, Erwin A. Kaestner, "Mobile perpetually self-correcting estimated time of arrival calculator", issued 1977-05-08
US patent 5570100, Gary W. Grube, Mark C. Naddell, Mark L. Shaugnessy, "Method for providing a communication unit's estimated time of arrival", issued 1996-10-29
US patent 5742635, H. Britton Sanderford, Jr., "Enhanced time of arrival method", issued 1998-04-21
US patent 5764686, H. Britton Sanderford, John R. Souvestre, "Enhanced time of arrival method", issued 1998-06-09
US patent 6144917, Thomas H. Walters, Darin J. Beesley, Stephen C. Robinson, "Calculation of estimated time of arrival (ETA) based on thoroughfare classification and driving history", issued 2000-11-07
US patent 7212975, David Frederick Bantz, Steven J. Mastrianni, "Apparatus and methods for providing an estimated time of arrival based marketplace", issued 2007-05-01
US patent 7457195, Robert Hughes Jones, "Estimating the time of arrival of a seismic wave", issued 2008-11-25
US patent 7536321, Shinichi Takahashi, Takenari Kawano, Kazuo Tsugu, Ken Nishioka, "Estimated time of arrival (ETA) systems and methods", issued 2009-05-19
US patent 6370231, Janice Paris Hice, "Method and system for calculating the estimated time of arrival of a service technician", issued 2002-04-09
US patent 6469665, Domenico G. Porcino, "Time of arrival estimation positioning systems", issued 2002-04-12
US patent 6675018, Eric Villier, Luis Lopes, Brendan Luddon, "Method of and system for estimating a time of arrival of a radio signal", issued 2004-01-06
US patent 8165792, Jeffrey Clinton Mikan, Justin McNamara, John Ervin Lewis, Fulvio Arturo Cenciarelli, "Methods and systems for broadcasting an estimated time of arrival", issued 2012-04-24
仕事を処理するのにかかる時間、コンピューター上で演算を終えるまでにかかる時間やファイルの移動・コピーに要する時間等にETAを使う。この場合、ETAは後付で「任務遂行予定時刻、estimated time of accomplishment」の略とされる(いわゆるバクロニム)[要出典]。一例として、Windowsに付属されているチェックディスクをコマンドラインで実行した際に、処理が完了するまでの所要時間（終了予定時刻ではない）をETAと表している。[9]
出典
^Cameron, M.; Brown, A. (May 1995). “Intelligent transportation system Mayday becomes a reality”. Aerospace and Electronics (NAECON 1995). 1. IEEE. pp. 340–347
^Carr, Gregory C.; Erzberger, Heinz; Neuman, Frank (June 2000). “Fast-time study of airline-influenced arrival sequencing and scheduling”. Journal of Guidance, Control, and Dynamics23 (3): 526–531.
^Roy, Kaushik; Levy, Benjamin; Tomlin, Claire J. (August 2006). “Target tracking and Estimated Time of Arrival (ETA) Prediction for Arrival Aircraft”. AIAA Guidance, Navigation, and Control 2006. AIAA. AIAA2006-6324.
^Lim, A.; Rodrigues, B.; Zhu, Y. (2005). “Airport Gate Scheduling with Time Windows”. Artificial Intelligence Review24 (1): 5–31. doi:10.1007/s10462-004-7190-4.
^Xiong, Bo; Luh, Peter B.; Chang, Shi Chung (April 2005). “Group Elevator Scheduling with Advanced Traffic Information for Normal Operations and Coordinated Emergency Evacuation”. Robotics and Automation (ICRA 2005). IEEE. pp. 1419–1424
