L'Île-Rousse–Sète: what our readings show
On the L'Île-Rousse–Sète route, our readings from 19 September 2026 cover one adult foot passenger with a reclining seat, for departures recorded in September and October 2026. The entry price of the window is €37.00, for a departure on 21 September 2026 with Corsica Ferries; the following month, October 2026, climbs back to €70.65 on average. According to Corsica Ferries, this route runs overnight, in about 14 hours, on a line open from April to October, at the rate of one departure a week from April to September.
A single company on the route
Corsica Ferries is the only company recorded on L'Île-Rousse–Sète. There is therefore neither a gap between companies nor a codeshare to weigh up: the price turns on the departure date. Across all dates, the company average for the foot passenger with a reclining seat settles at €54.25, its floor at €37.00. Our readings here cover only that profile: the packages with a vehicle do not come up on this route, which Corsica Ferries runs overnight.
September 2026 at the floor, October 2026 at the peak
The window reads in two months. September 2026 holds the floor, at €37.85 on average and €37.00 at its lowest, for a departure on 21 September 2026. October 2026 sits above it on both measures: €70.65 on average, and a minimum of €46.30 recorded on 24 October 2026. Put another way, the floor of October 2026 already stands above the average of September 2026: over this window, the month of departure decides before anything else. Between the two months, the average for the profile moves from €37.85 to €70.65, and the best price from €37.00 to €46.30. On a single-company route, it really is the departure date that sets the price, not the choice of company.
Monday rather than Saturday
Only Monday and Saturday carry recorded departures on this route. Monday comes out at €37.85 on average, Saturday at €70.65. The two readings overlap exactly: the Monday average is September 2026's, the Saturday average is October 2026's — the Mondays recorded fall in September, the Saturdays in October. Choosing a day here amounts to choosing a month, and the gap between the two days is the gap between the two months.
The cheapest dates
The two lowest dates fall on a Monday in September 2026: €37.00 on 21 September 2026 and €38.70 on 28 September 2026. Two Saturdays in October 2026 come next: €46.30 on 24 October 2026, then €95.00 on 3 October 2026, which closes the list. In October 2026 the ranking runs against the calendar: the later departure is the cheaper of the two. No October 2026 departure drops below the dearest of the September Mondays, €38.70: the two months do not overlap. All these crossings are operated by Corsica Ferries.
Leaving from another port for Sète
Towards Sète, it is Ajaccio that holds the floor: €34.20 for a departure on 26 October 2026, with Corsica Ferries. L'Île-Rousse follows close behind, at €37.00 for a departure on 21 September 2026, the same company on either side. The gap widens on the average: Ajaccio settles at €42.15, against €54.25 out of L'Île-Rousse. The cheapest port at the floor is therefore also the cheapest in everyday price, and it is on the average, not on the best fare, that the difference between the two ports shows.
What these readings cover
These prices are one-way fares for a foot passenger with a reclining seat, recorded on 19 September 2026 for departures in September and October 2026; the other months are not recorded out of L'Île-Rousse towards Sète. According to Corsica Ferries, the line runs from April to October, at one departure a week from April to September, sailing in the late afternoon and arriving around 08:00 the next morning; boarding is 30 minutes before departure on foot, 1 hour with a vehicle. A return trip assembled from two departures actually recorded comes to €79.00: €37.00 outbound on 21 September 2026 and €42.00 back on 22 September 2026, with Corsica Ferries in both directions. The opposite direction, Sète–L'Île-Rousse, is the subject of separate readings.