YYZ posted Oct and November stats. They are at 45.55 million total pax for 2018 so far, with one month left to post.
https://www.torontopearson.com/en/gtaa/statistics/#
A few other American airports have also posted full year figures.
Updated 2018
international passenger numbers for North America's busiest, with increases compared to 2017.
As the % increases indicate, YUL had a tremendous 2018 and is catching up to ATL, all the while keeping pace with YVR. They should easily overtake ATL in a few years at most.
YYZ is slowly catching up to JFK for #1 spot, and has a decent buffer with LAX.
YVR had a solid number in 2018, but EWR and ORD had even better increases, and with no new intl routes announced at YVR for 2019, and with AC slowing its intl growth, it will be difficult for YVR to catch up to either airport in 2019 or 2020.
FLL, with a near 20% increase last year, is on track to overtake DFW in 2019.
1. JFK 31.1 million (til November, +3.5%)
2.
YYZ 29.06 million (til November, +6.7%)
3. LAX 26.05 million (+4.4%)
4. MIA 21.86 million (+1.9%)
5. CUN 16.4 million
6. MEX 15.75 million
7. PTY
8. SFO 14.22 million (+5.9%)
9. EWR 12.9 million (til November, +9.2%)
10. ORD 12.67 million (til November, +10.3%)
11.
YVR 13.49 million (+8.5%)
12. ATL 12.5 million (+3.6%)
13.
YUL 12.27 million (+9.2%)
14. IAH 10.73 million (+3.7%)
15. DFW 8.74 million (+2.7%)
16. FLL 8.61 million (+19.8%)
17. BOS 7.58 million (+5.3%)