Here are some important Jain Kalyānak / Kalyānak–Kṣetra tirths in Uttar Pradesh that people usually visit from Lucknow:

1. Ratnapuri – Bhagwān Dharmanāth Kalyānak Bhūmi (near Ayodhya)

- On the Lucknow–Ayodhya highway, near village Ronāhī. - Considered place of 4 Kalyānaks of Bhagwān Dharmanāth (15th Tirthankar): - Garbha (Chyavan) Kalyānak - Janma Kalyānak - Dīkṣā Kalyānak - Keval‑jñān Kalyānak - From Lucknow it is usually done as a same‑day or short trip.

1. Ayodhya – Bhagwān Ādināth Janma Kalyānak Bhūmi

- Traditional Jain belief: Bhagwān Ādināth (Ṛṣabhdev) took Janma Kalyānak in Ayodhya. - There are Digambar and Shwetāmbara Jain temples in/around Ayodhya connected with this belief. - From Lucknow, Ayodhya is a common Jain yatra route together with Ratnapuri.

1. Hastinapur – Multiple Kalyānak Kṣetra (near Meerut)

- Ancient Jain Kṣetra in western U.P., reachable from Lucknow by train/bus (longer journey). - Connected especially with Bhagwān Śāntināth, Kunthunāth, Aranāth, etc. as Kalyānak‑bhūmi in Jain tradition. - Modern landmark: Kailash Parvat Mandir complex (Digambar), where a grand Panch‑Kalyānak Pratiṣṭhā was done. You can read more here

1. Chandrawatiji / Chandrawati – Bhagwān Chandraprabhu Kalyānak Kṣetra

- In Chandrawati (Chandrapuri), Uttar Pradesh, on the bank of river Ganga. - Jain tradition: place of Janma, Tapa and Keval‑jñān Kalyānak of Bhagwān Chandraprabhu (8th Tirthankar). - Recognised as “Kalyānak Kṣetra” and also noted as a heritage site by Archaeology Department of India. Details here

If by “Kalyānak near Lucknow” you mean which exact tirth to plan for a short yatra, most Jains from Lucknow usually start with:

• Ratnapuri + Ayodhya (1–2 days)

• Hastinapur
• Chandrawatiji

Each of these is a pure Jain Kalyānak‑bhūmi, so visiting with right bhāv (samkit, saiyam, stavana, prarthanā) is more important than just the distance.