When flying to Ethiopia, perhaps the most popular and most consistently affordable airline option is
Ethiopian Airlines. I have not personally flown Ethiopian. But if prices continue as they are, it will definitely be an option I will consider when we travel later this year.
Flights to Ethiopia leave the U.S. from Washington D.C./Dulles Airport. Ethiopian Airlines refuels in Rome, with no one getting off the plane, arriving in Addis about 18 hours after leaving Washington D.C. One really awesome advantage to Ethiopian is that you arrive in Ethiopia sooner. Depending on layovers, it is possible to get to Ethiopia from the western U.S. in 24-26 hours. Both Lufthansa and British Airways take more like 30-32 hours.
The Rome refuel stop on Ethiopian seems like it would be a nice break. But since you don't even get off the plane, in reality is is just more airplane time. Staying on one plane for 18 hours straight is not easy. I know that when we refueled (in Cairo on Lufthansa, and in Jordan on British Airways) all I wanted was to get going again. And it was during our refueling stop in Jordan that my usually mild-mannered 3 year old melted down and hollered, 'Get me off this stupid plane!" (mirroring my sentiments exactly!)
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Though some people have commented that the leg room on Ethiopian might be a little less than some other airlines, I have heard nothing but good things about the inflight-service. People say that the flight crew is extraordinarily kind and helpful, that the food is good, and that they felt very well taken care of.
One very important thing to know about Ethiopian, however, is that they tend to overbook. It is ESSENTIAL that you confirm your flights before you leave the US, AND at least once while you are in Ethiopia. If you do not reconfirm your homeward flight while you are in Ethiopia, your seat may be given to someone else. I personally know several people who got to the airport in Addis and discovered that their seat had been given away. If you opt to travel via Ethiopia, RECONFIRM in Addis!
Another thing to remember if you will be traveling between August and September of this year is that
this year is the Ethiopian millenium. Many, many Ethiopian currently living in the US are expected to travel to Ethiopia to celebrate, which may make finding tickets challenging during August and September. Since many Ethiopians opt to use Ethiopian Airlines, this airline will probably be the most busy of the three, and might not be as good an option as the other two during the months surrounding the millenium.
I welcome feedback from travelers who have used Ethiopian Airlines.
Other airline options
British Airways
Lufthansa