September is often the cheapest month to fly with Qatar Airways. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) You can also find low fares during other "off-peak" travel periods: 

• Mid-January to mid-March
• Early November
• May 

Important factors to consider:

• Destination: The cheapest month can vary depending on where you're flying. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) A flight to a popular winter sun destination, for example, will not be cheap in December, but may be in May.
• Peak travel seasons: Prices are usually highest during popular holiday seasons, like December and January, when demand is high.
• Flexibility: If your dates are flexible, you can use a "whole month" tool on flight search engines like Skyscanner to see the cheapest day to fly. 

To get the most accurate and up-to-date pricing for your specific route, it's best to check a few options online.

If you'd like, I can help you search for the best fares for your specific trip. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) Just let me know your departure and destination cities, and your preferred travel dates!.