The increasing trend in price transmission of agricultural produce through information dissemination is becoming a concern for both marketers and buyers. The study examined price transmission and determinants of selling prices in broiler and layer poultry markets in Southeast, Nigeria. It specifically investigated the future price relationship among markets, ascertained determinants of product prices and identified constraints to marketing of the products. Multi-stage, purposive and random sampling techniques were used to select 312 (156 broilers and 156 layers) marketers. Structured questionnaire issued to the respondents through personal interview was the instrument for collection of primary data. Descriptive and inferential statistical tools were used for data analyses. Findings showed evidence of integration both in broiler and layer poultry prices in the long run despite a potential short-run divergence amongst them. The price causality test across the States for broiler market revealed that a unidirectional causality runs from Anambra to Enugu, Anambra to Imo and Enugu to Imo, and the layer market showed a unidirectional causality from Anambra to Imo and Imo to Enugu. The significant determinants of sales price were cost price of birds, purchase size and transportation cost for broiler marketers, and cost price, daily market charges, purchase size and cost of transportation for layer marketers. The constraints to marketing of the products in order of seriousness were inadequate capital, increase in transportation cost, price instability, high price of feed, and price increase for chicks. Mitigation of the constraining variables through the provision of adequate transportation and communication infrastructure, cheap credit facilities, and subsidization of costs of feeds and chicks by Government will ensure fair and sustainable pries of the products across the markets.