Pekkanen's dictionary suggests salve advenis/advenitis or bene adveneris/adveneritis, but I found no classical attestations of these. These are understandable phrases, but I don't know how canonical they are.

I dug around and found some relevant phrases in the literature that you might want to build on:

• Plautus, Trinummus, 1097: et salve et salvom te advenisse gaudeo

• Pacuvius, Tragoediae, 232: expectata áduenis: salue, hospita!

• Plautus, Bacchides, 101 (accepting a welcome, but can be turned around for a welcoming idiom): Bene me accipies advenientem, mea soror.

• Cicero, De republica, 1.18 (on how someone was happy to welcome someone): eorum adventus periucundus et pergratus fuisset

• Cicero, Epistulae ad Atticum, 4.19.1 (on arrival of a letter, but works also for arrival of a person): O exspectatas mihi tuas litteras! O gratum adventum!

It seems that if you want a simple everyday "welcome", then salve(te) is a good choice. If you want more flavor, use or adapt any of the quotes above.

Pekkanen's dictionary suggests salve advenis/advenitis or bene adveneris/adveneritis, but I found no classical attestations of these. These are understandable phrases, but I don't know how canonical they are.

I dug around and found some relevant phrases in the literature that you might want to build on:

• Plautus, Trinummus, 1097: et salve et salvom te advenisse gaudeo

• Pacuvius, Tragoediae, 232: expectata advenis: salue, hospita!

• Plautus, Bacchides, 101 (accepting a welcome, but can be turned around for a welcoming idiom): Bene me accipies advenientem, mea soror.

• Cicero, De republica, 1.18 (on how someone was happy to welcome someone): eorum adventus periucundus et pergratus fuisset

• Cicero, Epistulae ad Atticum, 4.19.1 (on arrival of a letter, but works also for arrival of a person): O exspectatas mihi tuas litteras! O gratum adventum!

It seems that if you want a simple everyday "welcome", then salve(te) is a good choice. If you want more flavor, use or adapt any of the quotes above.