Background
From time to time, AY will make the Y traveller an offer to upgrade. This thread lists when, how and and how much the upgrade is.

Selection process is unknown, but it is likely that neither fare class on original ticket nor tier status of traveller is a selection criteria, at least not to travellers advantage. From the reports made so far, both travellers with and without FF# in the reservation have gotten offers.

Offers are likely made only when Y is oversold or nearly full. Some travellers have reported declining offer and being upgraded for free later ("op-up").

Offers are fixed price offers, either in € or in AY+points. The latter kind is only valid for members of AY+, while €-offers are directed to all kind of travellers.

Offers are made either in mail or via text message and recipient has 72 hours to repspond. Some reports says this time is now shortened to 48 hours. Text message offers typically arrive close to departure and may not state a last time to reply.

Offers in text message can be replied to and upgrade is instantly processed. Offers in mail has occasionally not cleared (said to be "sold out" when accepting offer too late).

If offer is accepted and upgrade clears, new ticket is issued in F, so a confirmed upgrade with all perks of business class included. Mileage earning is according to original fare class however.


Development
In august 2015 AY announced a trial to let travellers bid for upgrades, initially on AY89 and AY90. It is likely that bidding will affect the number of fixed price offers.

The trial has been made permanent, and the bidding for upgrade has been extended to more longhaul routes.
The program has also led to a consolidation of upgrade options to one webpage
https://www.finnair.com/int/gb/upgrade-options
where you can upgrade by bidding, by using AY+ points or by accepting last minute cash offers. The latter ("Last minute" offers) are the same as have been discussed in this thread.. Finnair still pushes those offers via e-mail and text-message, but now also shows them on this webpage.




Offers made
Here is a condensed list of offers made, processed including post #213.
Figures are in € unless otherwise stated. Each destination's offers are recorded in a single line in time order.

Longhaul
SIN-HEL 248, 348, 348
HEL-SIN 499, 499, 348, 349€

JFK-HEL 48k points, 348€, 348€, 499

HKG-HEL 248
HEL-HKG 348

BKK-HEL 298, 348, 348
HEL-BKK 48k points, 348€, 348€ (290€ on phone? Not yet confirmed)
HEL-HKT 348

NRT-HEL 498
HEL-KIX 348, 375 (12/19, 01/20)
KIX-HEL 391 (12/19, 01/20)

ICN-HEL 248, 318

HEL-PVG 298
PVG-HEL 448, 498

CKG-HEL 228
XIY-HEL 248

HEL-DEL 198
HEL-DEL 300 (4/19)

YYZ-HEL 225€, 225


Shorthaul
DXB-HEL 99

HEL-VNO 7k points

HEL-BUD 69€
BUD-HEL 69, 8k points, 69

HEL-PRG 69€
PRG-HEL ≈70€

CPH-HEL 7k points, 7k, 69€, 7k, 69€
HEL-CPH 69€, 69, 69

HEL-ARN 7,5k points, 41€

HEL-GOT 7k points
GOT-HEL 7k points

HEL-VIE 69€

HEL-CDG 69€, 69€, 69
CDG-HEL 89€

HEL-MXP 69

HEL-TXL 9k points, 9k
HEL-DUS 69

HEL-HAM 69,69
HAM-HEL 69

HEL-FRA 69€
FRA-HEL 69€, 89, 89€

BRU-HEL 69

GVA-HEL 69
HEL-GVA 69, 89

HEL-LHR 9k points
HEL-LHR 109€

HEL-MAD 89€, 9k points

HEL-SVO 69€

HEL-WAW 79€
WAW-HEL 79€

DUS-HEL 69€

HEL-OSL 42€

HEL-MUC 90 (01/20)
MUC-HEL 115€ (01/20)