Learn Farsi: از شنبه تا دوشنبه این پرواز لغوپذیر است. - From Saturday to Monday, this flight is cancellable.

It combines the noun لغو (cancellation) with the suffix -پذیر (-pazir). This suffix comes from the present stem of the verb پذیرفتن (to accept) and acts like the English suffix "-able" or "-ible". So, لغوپذیر literally means "accepting cancellation," or simply "cancellable."

How would the meaning change if I said لغو شده است instead of لغوپذیر است?

Using لغو شده است means the flight has actually been cancelled (the passive voice). Using لغوپذیر است means the flight has the capacity to be cancelled by the passenger, likely without penalty, but it is currently still scheduled to fly.

Does the suffix -پذیر in لغوپذیر only attach to Arabic loanwords?

It is very commonly attached to Arabic verbal nouns like لغو or امکان (possibility, making امکان‌پذیر - possible). However, it can also attach to native Persian nouns like آسیب (harm, making آسیب‌پذیر - vulnerable). In all cases, it forms an adjective showing susceptibility or capacity.

Why is the time phrase از شنبه تا دوشنبه placed at the very beginning of the sentence?

In Farsi, time phrases typically go at the very beginning of the sentence or right after the subject. Placing از شنبه تا دوشنبه at the beginning emphasizes the specific timeframe, which is common when outlining ticket rules or terms and conditions.