Yes—exposed Ilford Delta 400 will generally be fine if you wait 8–16 months before developing it, especially if it’s stored in a cool, dry, dark place. Developing exposed film as soon as practical is best, but for this film the delay is unlikely to cause noticeable image loss for normal use.

If possible, colder storage is better: a refrigerator helps, and a freezer is even better for long-term keeping. But room-temperature storage for this timeframe is usually not a major problem.

A bigger concern is air travel and security scanning. X-rays can fog undeveloped film, so try to avoid having it scanned if you can. Hand inspection is preferable. Some people also store film in foil or a metal container to reduce incidental radiation exposure, though the main issue is still airport scanners.

So: waiting to develop it yourself is reasonable, and the film should still look good if stored well. The travel/scanning risk is more important to manage than the storage time.