Porto to Istanbul flights, non-stop

The way back

1. M
2. T
3. W
4. T
5. F
6. S
7. S
8. Nov16€37713:25
9. 17€35613:10
10. 18€33407:55
11. 19€23513:25
12. 20€43307:55
13. 21€23813:25
14. 22–no fare seen
15. 23–no fare seen
16. 24€26807:55
17. 25€32707:55
18. 26–no fare seen
19. 27–no fare seen
20. 28–no fare seen
21. 29–no fare seen
22. 30–no fare seen
23. Dec1–no fare seen
24. 2–no fare seen
25. 3–no fare seen
26. 4–no fare seen
27. 5€30107:55
28. 6€25613:30
29. 7–no fare seen
30. 8–no fare seen
31. 9€57107:55
32. 10–no fare seen
33. 11€23613:30
34. 12€27407:55
35. 13€27413:30
36. 14€23713:30
37. 15€23813:10
38. 16–no fare seen
39. 17€23607:55
40. 18–no fare seen
41. 19–no fare seen
42. 20–no fare seen
43. 21–no fare seen
44. 22€23913:10
45. 23€23513:30
46. 24–no fare seen
47. 25€23513:30
48. 26€23913:30
49. 27€23313:30
50. 28€23513:30
51. 29€23513:10
52. 30€23513:30
53. 31–no fare seen
54. Jan1€27013:30
55. 2–no fare seen
56. 3–no fare seen
57. 4–no fare seen
58. 5–no fare seen
59. 6–no fare seen
60. 7–no fare seen
61. 8–no fare seen
62. 9–no fare seen
63. 10–no fare seen
64. 11–no fare seen
65. 12–no fare seen
66. 13–no fare seen
67. 14–no fare seen
68. 15–no fare seen
69. 16–no fare seen
70. 17–no fare seen
71. 18–no fare seen
72. 19–no fare seen
73. 20–no fare seen
74. 21–no fare seen
75. 22–no fare seen
76. 23–no fare seen
77. 24–no fare seen
78. 25–no fare seen
79. 26–no fare seen
80. 27–no fare seen
81. 28€23707:55
82. 29–no fare seen
83. 30–no fare seen
84. 31–no fare seen
85. Feb1–no fare seen
86. 2–no fare seen
87. 3€29613:30
88. 4–no fare seen
89. 5–no fare seen
90. 6–no fare seen
91. 7€24013:30
92. 8–no fare seen
93. 9–no fare seen
94. 10–no fare seen
95. 11–no fare seen
96. 12€23613:30
97. 13–no fare seen

Of the 30 days with a time, the day's cheapest flight leaves in the morning on 9, in the afternoon on 21 and in the evening on 0.

Istanbul to Porto non-stop: from €233 on 27 Dec, with fares on 30 of the next 90 days.