The best price found from United States to Ethiopia is on September 1st, 2015, travelling with EgyptAir. See more options, compare prices and book: search flights.
For Ethiopia, flights during the month of August, over Easter, Christmas and New Year should be booked well in advance. Ethiopians living abroad tend to visit their families during this time, and tour groups often try to coincide with the major festivals. Ticket prices are highest during this period.
Addis Ababa’s Bole International Airport is the only international airport in Ethiopia. Although modern, upon arrival there’s little more than a 24-hour bank, a restaurant and a few cafes; baggage carts are free. When departing, there’s an internet lounge, a bar and duty-free shops.
Ethiopia’s only international and national carrier, Ethiopian Airlines, is rated as one of the best airlines in Africa and has a good safety record. Ethiopian Airlines is also one of the largest African carriers, with a modern fleet of 737s, 757s, 767s and four 787 Dreamliners (with eight more on order). There are 50 or so offices worldwide, which sell both international and domestic tickets directly. Alternatively the website is safe and reliable for online bookings.
If you want to fly with a European airline such as Luthansa or KLM, double-check that you will actually be on one of their planes and not on an Ethiopian Airlines plane. They route share and commonly bundle their passengers onto Ethiopian Airlines and then kindly charge you more than you’d have paid if you’d bought directly with Ethiopian Airlines.