Washington to Ontario: buy now or wait?
Buy now FareScore 79/100
usually $139 $103 ≈ €92 Today's best fare
Cheaper than 79% of what we have seen
15 Dec Frontier Airlines With a stop
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All fares Washington → Ontario
Cheapest first. Every price is live and goes straight to booking.
15 Dec
12:00
Frontier Airlines · 18h 17m
With a stop
€92
16 Dec
01:55
Frontier Airlines · 13h 49m
With a stop
€92
26 Nov
18:54
Frontier Airlines · 13h 20m
With a stop ↓8%
€118 €109
18 Nov
23:07
Frontier Airlines · 28h 01m
With a stop ↓4%
€115 €110
19 Nov
17:31
Frontier Airlines · 9h 37m
With a stop
€110
1 Jan
01:51
Frontier Airlines · 13h 16m
With a stop
€115
31 Dec
12:40
Frontier Airlines · 19h 33m
With a stop
€124
5 Dec
18:40
Frontier Airlines · 11h 37m
With a stop
€133
6 Dec
01:55
Frontier Airlines · 13h 49m
With a stop
€133
24 Nov
18:09
Frontier Airlines · 28h 42m
With a stop
€139
9 Jan
23:00
Frontier Airlines · 9h 15m
With a stop
€143
27 Jan
22:30
Alaska Airlines · 20h 08m
With a stop
€162
What the history says
Prices recorded 282
Typical price €124
Lowest we saw €92
You save today €32
Based on 282 prices we recorded on this exact route, compared against the same departure month.
Best booking window
14–27 days — is when this route has been cheapest to book: €115 typical, on 100 observations. That is about €61 less than booking in the last two weeks.
Cheapest months to fly to Ontario
November €118 116 observations
October €123 58 observations
December €124 91 observations
Booking tips from our fare data
- How far in advance should you book a flight?
- Book 1–1.5 months before departure. Tracking the same flights at every lead time (94,914 flights on 19,442 routes, 2026-06-14 to 2026-11-04), that window had the smallest average premium over each flight's lowest fare: +16.8%, against +49.3% in the last 3 days.
- What is the cheapest day of the week to fly?
- Wednesday. Comparing each fare with the median of its own route, Wednesday departures were +3.4% and Tuesday +4.2%, while Friday was the dearest at +10.6%. Weekend departures cost more than midweek ones.
- What is the cheapest month to fly?
- November 2026. Comparing each route's fares month by month (booked 8–60 days ahead), November 2026 departures were -1.1% against the route's own median, while January 2027 was the dearest at +17.5%. Covers September 2026, October 2026, November 2026, December 2026, January 2027; fares observed 2026-06-14 to 2026-11-04.
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