Oil Prices: As an airline, SIA.TO's profitability is highly sensitive to fluctuations in oil prices, a major operating expense. Higher oil prices typically lead to lower profits and potentially lower stock prices.

Economic Conditions: Economic downturns can reduce travel demand, impacting SIA.TO's revenue and profitability, which can negatively affect its stock price. Conversely, strong economic growth often boosts travel and SIA.TO's stock.

Competition: The level of competition from other airlines can affect SIA.TO's pricing power and market share, impacting revenue and profitability and consequently influencing its stock price.

Regulatory Changes: New regulations or changes to existing ones related to aviation safety, emissions, or airport operations can significantly impact SIA.TO's operating costs and profitability, affecting its stock price.

Currency Fluctuations: Changes in currency exchange rates can affect SIA.TO's revenue (if denominated in foreign currencies) and expenses (if incurred in foreign currencies), influencing profitability and subsequently its stock price.

Company Performance: SIA.TO's financial performance, including revenue growth, profitability, and operational efficiency, directly affects investor sentiment and, therefore, its stock price. Strong performance typically leads to higher stock prices.

Investor Sentiment: Overall market sentiment and investor confidence in the airline industry can significantly influence SIA.TO's stock price, regardless of its actual financial performance. Positive sentiment often leads to higher stock prices.

Global Events: Major global events, such as pandemics, terrorist attacks, or political instability, can disrupt travel patterns and significantly impact SIA.TO's revenue and stock price.