To achieve a comprehensive understanding of species ecology towards the effective conservation of migratory species, migration ecology needs to be considered because it significantly influences population dynamics. For this, it is essential to explore how species react to the complex interplay of intrinsic and extrinsic conditions to optimize their migratory journey, including landing and departure decisions. Nocturnal migratory songbirds, which often migrate alone and alternate migratory endurance flights with stopovers, provide an excellent group for studying such individual decisions. We identified five significant knowledge gaps in the migration ecology of songbirds to guide future research: 1) Inferring stopover functions from landing decisions; 2) assessing the consequences of migration distance on the decision-making process; 3) measuring how predation danger affects the decision-making process; 4) studying the consequences of habitat properties on the decision-making process in anthropogenically modified landscapes; and 5) exploring when and where bird mortality occurs during migration. To address these gaps by studying songbird decisions in flight and at stopovers, we propose novel frameworks that integrate methods applied at different scales and discuss promising future directions to stimulate research for achieving a holistic understanding of migration and advancing the conservation of threatened migratory species.