Airborne network for aeronautic swarm is the information interaction bond between swarm members, whose routing strategy directly affects the real-time performance and reliability of information transmission, and then affects the combat effectiveness of networked swarm. Considering that there are many uncertainties in airborne network for aeronautic swarm, in response to the risk of route failure and avoid routing updates, a Failure-Oblivious routing method from the perspective of routing algorithm was proposed under software-defined network architecture. Unlike traditional routing strategies, this method can deal with routing failure problem without the burden of predicting routing failure by using random multipath routing algorithms. Theoretical derivation and simulation verification show that this routing method can reduce the risk of route failure in airborne network for aeronautic swarm, thus guaranteeing that communication delay cost is under control.