- Win Rate
- 49.0%
- Pick Rate
- 6.4%
- Ban Rate
- 2.8%
Kai'Sa vs Irelia
- Patch
- 26.19
- Games
- 5,795
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Oct 5, 2026 UTC
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Kai'Sa vs Irelia is a very close matchup in LoL patch 26.19. Kai'Sa wins with a 50.0% win rate (+0.0%) over Irelia based on 6 games. Kai'Sa holds the advantage in both the early and late game. Below you'll find the best Kai'Sa build, runes, laning stats, and strategies for the Kai'Sa vs Irelia matchup.
Kai'Sa Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Kai'Sa performs against them. You'll get head-to-head win rates, laning stats, the best build and runes for the matchup, and early vs late game analysis — all based on real ranked data.
Who wins Kai'Sa vs Irelia?
Kai'Sa wins 30.0% of these games. With this many games the true rate is most likely between 10.8% and 60.3% (95% range).
- Expected
- 48.5% From both champions' overall Bot win rates
- Matchup effect
- −18.5 pts Observed minus expected
- Sample
- 10 games Lane: Bot
- vs patch 26.18
- — Not enough games on both patches
Lane: Bot · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
They also met in another lane (Mid): 7 games, Kai'Sa won 57.1%.
They also met in another lane (Top): 5 games, Kai'Sa won 0.0%.
Key takeaways
- Only 10 Kai'Sa vs Irelia games were recorded in the Bot role on patch 26.19 — too few to say who is favored. Treat the numbers below as provisional.
How we calculate this
Games: ranked Solo/Duo and Flex games on the North America server from the patch shown. Remakes (games under 5 minutes) are excluded.
A game only counts when Kai'Sa and Irelia played the same position on opposite teams, so roaming, lane swaps within a team or a champion merely being in the same game never count as this matchup.
The 95% range is a Wilson score interval. Confidence comes from how wide that range is: within ±3 points is very high, ±5 high, ±8 moderate, anything wider low. Below 20 games a matchup is not classified at all.
Expected win rate combines both champions’ win rates in this lane (same games and filters) with the log5 formula: E = A(1−B) / (A(1−B) + B(1−A)). Matchup effect = observed − expected.
"What changes" compares Kai'Sa's choices in this matchup with the same champion's other games in the same lane, and lists a change only when it is at least 3 points and statistically significant (two-proportion z-test, |z| ≥ 2, 20+ games).
Results are not split by rank: the sample per rank is too small for honest per-rank matchup numbers.
Kai'Sa vs Irelia Laning Stats
Only 9 games have a 15-minute snapshot so far — the lane-phase numbers appear from 30.
Whole-game averages
Kai'Sa vs Irelia Win Rate by Game Length
Kai'Sa's win rate against Irelia by game length. The dot is the win rate, the bar its 95% range and the dashed line the champion's usual win rate at that length. Lengths with fewer than 25 games are left blank.
No game length stands out: Kai'Sa's results against Irelia in short and long games are within the margin of error of each other.
Kai'Sa vs Irelia Power Spikes
Who is ahead at each stage, measured from these games. A stage reads "Even" when the difference is inside the margin of error, and "Insufficient data" when there are too few games to tell.
- Lane (15 min)Insufficient data
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Kai'Sa Changes Against Irelia
Only 10 games so far — too few to compare what Kai'Sa players do in this matchup with their usual choices (needs 20).
Best Kai'Sa Build vs Irelia
Usual Kai'Sa build (Bot)
82.6% win rate · 23 games
Against Irelia
Not enough matchup-specific build data: only 0 of 10 Kai'Sa games against Irelia carried a complete build, which is too few to recommend an item path from. Use Kai'Sa's standard build instead.
Builds are ranked by the lower edge of their win rate range, not the raw win rate, so a build seen in a handful of wins never outranks a proven one.
Best Kai'Sa Runes vs Irelia
Usual Kai'Sa runes (Bot)
Lethal Tempo
70.4% win rate · 27 games
Against Irelia
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Kai'Sa draft in Draft Lab
Draft Lab lays out both teams lane by lane with live matchup win rates, damage profiles and game-phase lean, and suggests picks and bans from current meta data.
- Full 5v5 draft board
- Lane matchup win rates
- Pick and ban suggestions
Kai'Sa matchup data for League of Legends patch 26.19. The table below shows Kai'Sa's win rate, gold difference, and performance stats against every champion in the current meta. Click any champion name to see a detailed head-to-head breakdown including the best Kai'Sa build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Kai'Sa Matchups
Hardest for Kai'Sa
Easiest for Kai'Sa
Win rate and games for each matchup. Lists are ranked by the edge of the 95% range so small samples cannot top them; matchups with at least 50 games only.
Help us maintain accuracy! If you notice incorrect stats, missing data, or any issues, your feedback directly improves the quality of our data for the entire community.
Kai'Sa vs Irelia FAQ - Patch 26.19
Who wins Kai'Sa vs Irelia?
Only 10 Kai'Sa vs Irelia games were recorded in the Bot role on patch 26.19 — too few to say who is favored. Treat the numbers below as provisional.
What is Kai'Sa's win rate against Irelia?
Kai'Sa wins 30.0% of 10 Bot games against Irelia on patch 26.19 (95% range 10.8–60.3%). Based on both champions' overall Bot win rates, 48.5% would be expected.
Does Kai'Sa counter Irelia?
There are only 10 Kai'Sa vs Irelia games in this lane on patch 26.19 — too few to answer reliably yet.
Who wins lane, Kai'Sa or Irelia?
There are not enough games with a 15-minute snapshot yet (9) to say who wins lane.
Does Kai'Sa outscale Irelia?
There are too few games of each length to tell yet.
When is Irelia strongest against Kai'Sa?
On current data there is no stage of the game where Irelia is ahead of Kai'Sa beyond the margin of error.
What should Kai'Sa build against Irelia?
There are not enough games for a matchup-specific core, so use Kai'Sa's usual Bot core: Runaan's Hurricane, Lord Dominik's Regards, Yun Tal Wildarrows.
What runes should Kai'Sa use against Irelia?
Use Kai'Sa's usual Lethal Tempo page (Precision + Inspiration); there are too few games for a matchup-specific page.