You can apply for a visa:
1) online – getting an e-visa in advance can help to prevent delays, tourist e-visas are valid for up to 3 months
To apply online and get all the visa information you need please visit https://visa2egypt.gov.eg/
2) on arrival in Egypt – approved airports have kiosks in the arrival hall before you reach the immigration counters where you can buy a visa for 25 US dollars (cash only – Egyptian officials prefer dollars, but you may be able to pay in British pounds or euros, visas on arrival are valid for up to 30 days)