Question : If punctuality is required for you to book a flight, which airline is your best bet?
Answer : American Airlines will have you to GLA on time 72% of the time. Stick to American Airlines and you won't spend more time in airports than you have to. If they are late for some reason though, the average delay time is 30-40 minutes.
Question : Will you do what it takes to get the absolute lowest-cost flight?
Answer : The cheapest day to fly in February is Monday. Having flexibility in your travel plans means you can save, so be sure to plan ahead when possible.
Question : Do prices change more for this route than others?
Answer : Prices are fluctuating much more for this route than the majority of routes. The further out you book a route, the more likely you are to save.
Question : Should you be aware of any airlines that have a reputation of delays for this route?
Answer : Flights on US Airways to Glasgow from Philadelphia during the last month were delayed 30% of the time. If you're on US Airways, be sure to sign up for the delay notifications to stay up to date with your flight's status.