Aegean has launched a Singles Day sale valid network wide and also on Olympic Air from November 23 to March 10, 2027.

The 30% discount applies to one-way and round trips, as well as connecting itineraries. You must use the code FLYSINGLE when making the booking and you must choose Euro as the current.
You can access this sale on Aegean’s website here.
Booking:

You must use the FLYSINGLE code when making the booking.

The fare display shows the non-discounted price, but the discount is shown when you add the flights to your card.
I actually made two bookings using this sale for travel in early January on dates that are likely excluded from their Black Friday sale coming in a couple of weeks.
Conclusion
This is a great sale that applies to all flights during the busy Christmas and New Year’s period that aren’t usually discounted.
There is the Black Friday/Cyber Monday sale coming up later in the month,
Terms and conditions of this sale:
The offer applies to all direct and connecting flights across our network, both one way and roundtrips. It applies to flights operated by AEGEAN and Olympic Air, for bookings made from November 11th, 2026 to November 12th, 2026 and for travel between November 23rd, 2026 – March 10th, 2027. All codeshare flights are excluded from the offer. The 30% discount will only be valid when the promotional code “FLYSINGLE” is entered in the “Promo Code or Credit Voucher” field displayed in the booking form and cannot be combined with any other offer. Only one promotional code can be used on each booking. The reservation must contain only one adult passenger. Infants (up to 2 years old) and children (up to 11 years old) are excluded from the offer. The discount is applied to the ticket fare and does not apply to taxes. The offer is valid for Economy class. The promotional code is valid for transactions in Euro (€). In case of ticket cancellation refund policy is applied depending on fare category. Ticket changes are permitted – relevant charges depend on fare category. The offer is valid from November 11th, 2026 00:01 Greek time until November 12th, 2026 23:59 Greek time.