3x15 The Wrath of Savitar

Based on:
http://www.alltimelines.com/dc-comics-multiverse-chronology/dc-comics-live-action-television/

This is a list with episodes of various DC Entertainment TV series in internal chronological order, according to this list: https://geekritique.net/2015/05/19/arrow-and-the-flash-chronological-order

• The rest of Supergirl season 1 can be watched after S04E23 of Arrow.

2017-10-27: The post on geekritique.net, which this list is based on, hasn't been updated in roughly half a year, so I consider it to be abandoned. Thus I advise anyone using this list to use my other Trakt Arrowverse list instead: https://trakt.tv/users/nidunc/lists/arrowverse-viewing-order-according-to-thetimelinesite-com.
Besides, the geekritique.net list didn't include all episodes in the first place (see the above bullet point for an example), while thetimelinesite.com does include all episodes (and is still being updated).

I will still be checking geekritique.net from time to time, but I presume it won't be updated in the future.

Content set on DC's Speed Force.