What a flight route normally costs
Without a reference price, "$780" means nothing. How a route's normal price is calculated, and how to read its curve without fooling yourself.
A route's normal price is the median fare observed on that route over weeks — not the average, and not today's screen price. It is the only number that tells you whether $780 for Montreal–Paris is a good deal or a poor one.
Without that comparison point you are not deciding; you are guessing. And $780 is an excellent deal in July, a bad one in February.
Why the median, not the average
On any given route, a handful of business tickets at $4,000 is enough to drag the average upward — and to convince you that $1,200 is reasonable when it is not.
The median ignores those extremes. It answers a precise question: what price do you find half the time? That is the only one that matters when you are buying one ticket, not a statistical basket.
The three conditions for an honest reference
A large enough sample
A reference built on four observations is not a reference, it is an anecdote. It takes several dozen before the number survives one aberrant day — a strike, a system outage, a flash sale.
Unspectacular, and exactly what separates data from a marketing claim.
One single currency
Mixing Canadian and US dollar observations into the same calculation produces a number that references nothing. The mistake is easy to make and invisible once made: the result still looks like a price.
A measurement date, not a calculation date
A reference recomputed nightly shows a recent date even if no price has moved in three weeks. Real freshness is the date of the last observation, not of the last calculation. A figure "updated today" may rest on measurements from another month.
Reading the price curve without fooling yourself
Once the reference exists, you want to watch the price move. Three traps wait.
| The trap | What you think you see | What to look at |
|---|---|---|
| Noise | A dramatic drop | Day-to-day change, not hour-to-hour |
| The false slope | A clear trend | Enough days for a direction to emerge |
| The misleading date | Fresh data | The date of the last real observation |
Noise. A price sampled several times a day draws a sawtooth that says nothing: it is the same flight seen hours apart, through two different suppliers. What matters is movement from one day to the next.
The false slope. Two points always make a line. You need enough days for a direction to separate itself from chance — and below that, the honest answer is "we do not know yet". A tool that draws a trend from three observations is selling you a certainty it does not have.
What a reference price is actually for
Turning an intuition into a threshold. "I will pay up to $780" is a decision. "I will see how it goes" is not, and it consistently costs more, because it ends up being settled under time pressure.
Knowing when NOT to buy. A price 40% above the reference is not an opportunity, whatever countdown sits beside it. Your budget says what you can pay; it does not say what the flight is worth. Confusing the two is the hurried traveller's most expensive mistake.
Judging an alert. A threshold set 30% below the reference will never fire. One set above it will fire constantly and teach you nothing.
Where to find your route's normal price
We publish the reference value for the routes we monitor, along with the number of observations behind it and, where history allows, how it has moved. Routes departing from Canada and the United States are gathered on our route price pages: the figure there is raw and dated.
From there, the reference becomes a threshold and the threshold becomes an alert — how to set up a flight alert covers what follows.
Frequently asked questions
Does the average price of a flight mean anything?
Little, on its own. An average flattens seasonality, mixes cabin classes and is easily dragged by a few very expensive tickets. A per-route median over a dated window says far more.
How many observations make a reliable reference?
Several dozen at minimum. Below that, a single atypical day visibly shifts the figure. A serious reference states its sample size — if it does not, that is already an answer.
Is a price below the reference always a good deal?
Not always. Check what the fare includes before concluding: baggage, seat selection, change conditions. That is the subject of what the displayed price does not tell you.
Why does my route have no reference price?
Because we do not have enough observations on it yet. Publishing a figure based on four measurements would be worse than publishing none: it would look solid without being solid.