韓媒ZDNet Korea引述三星報導，「Galaxy S5」4月11日於全球125個國家開賣後，平均首日銷量較前代的Galaxy S4超出逾30%。在部分歐洲地區，甚至已是S4的兩倍以上；S5接下來還會在25個國家陸續發售。
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若不是因為庫存售罄，銷售數據還會高上許多。在巴黎、阿姆斯特丹、倫敦等地的三星旗鑑店，數百位民眾開店前就來排隊搶位置，


S5 in France


S5 in KSA

南韓本土市場方面，SK電信搶先在3月27日開賣S5希望能成為第一批入手S5的消費者。韓聯社引述市場人士估計，截至4月11日為止的12個工作天內，，S5在南韓的銷售量約接近12萬支，每天約可在南韓賣出10,000支，對當地智慧機市場的佔有率已來到28%。

預估S5將可於25天內達標1000萬支紀錄。

GS5 sales seem to be proceeding better than the predecessor S4, citing media reports form South Korea suggesting “Total of 120k units have been sold domestically thus far and overseas sales also off to a better start than the GS4. Could reach 10m mark two days faster than the GS4 (which took 27 days). Better-than-expected GS 5 results should boost Synaptics, maker of the fingerprint sensor in the GS5, after a 9% drop in the last week over fears about the phone.
- Rajvindra Gill of Needham & Co.

Our U.S. carrier checks indicate first-day sell-through of Samsung’s Galaxy S5 smartphones was in line with our expectations, with average sell-through rate reaching 60% within four hours of launch. We found the highest sell-through rate at Verizon, driven by “buy one, get one free” promotions, with multiple stores indicating stock-outs within a few hours of launch.
- John Vinh of Pacific Crest

因為去年Galaxy S4的遇冷經驗，Galaxy S5的備貨計畫已趨保守，據稱是回到Galaxy S3的水平。