FanDuel vs Fliff: where their odds disagree
Over the last 30 days, FanDuel and Fliff quoted the same line at prices that summed to less than 100% on 34 game-markets — a cross-book arbitrage — with an average net edge of 4.83% and a peak of 14.95%. On plain vig, FanDuel is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: FanDuel vs Fliff
| FanDuel | Fliff | |
|---|---|---|
| Overall overround | 4.58% | 6.23% |
| Moneyline | 4.00% | 5.61% |
| Spreads | 4.84% | 6.49% |
| Totals | 4.90% | 6.50% |
| NFL | 4.57% | 6.07% |
| MLB | 4.56% | 6.13% |
| NBA | 4.50% | — |
| NHL | 4.85% | — |
| MLS | — | 9.87% |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 34 | 4.83% | 14.95% |
How big the edges were
Share of detections by net edge bucket. Most cross-book edges are small; the tail is where the money and the execution risk both live.
Recent examples
Best detection per game-market, most recent first. These windows have closed.
| Game | Market | Legs | Net edge | Detected |
|---|---|---|---|---|
| Seattle Mariners @ Colorado Rockies · MLB | spread 1.5 | Colorado Rockies @ Fliff + Seattle Mariners @ FanDuel | 2.32% | Sep 18, 11:07 PM ET |
| Chicago Cubs @ Cincinnati Reds · MLB | total 10.5 | Over @ Fliff + Under @ FanDuel | 6.90% | Sep 18, 9:36 PM ET |
| Milwaukee Brewers @ Pittsburgh Pirates · MLB | moneyline | Milwaukee Brewers @ FanDuel + Pittsburgh Pirates @ Fliff | 0.98% | Sep 17, 1:41 PM ET |
| Miami Marlins @ Arizona Diamondbacks · MLB | total 9.5 | Over @ FanDuel + Under @ Fliff | 2.44% | Sep 16, 9:45 PM ET |
| Kansas City Royals @ Houston Astros · MLB | spread 2.5 | Houston Astros @ FanDuel + Kansas City Royals @ Fliff | 0.61% | Sep 15, 10:04 PM ET |
| Cleveland Guardians @ Minnesota Twins · MLB | total 5.5 | Over @ FanDuel + Under @ Fliff | 6.37% | Sep 11, 10:03 PM ET |
| Cleveland Guardians @ Minnesota Twins · MLB | moneyline | Cleveland Guardians @ Fliff + Minnesota Twins @ FanDuel | 7.28% | Sep 11, 10:03 PM ET |
| Los Angeles Dodgers @ Miami Marlins · MLB | spread 3.5 | Los Angeles Dodgers @ Fliff + Miami Marlins @ FanDuel | 7.70% | Sep 11, 10:03 PM ET |
| Pittsburgh Pirates @ Chicago Cubs · MLB | spread 8.5 | Chicago Cubs @ Fliff + Pittsburgh Pirates @ FanDuel | 2.48% | Sep 11, 3:54 PM ET |
| Los Angeles Dodgers @ Miami Marlins · MLB | moneyline | Los Angeles Dodgers @ FanDuel + Miami Marlins @ Fliff | 1.20% | Sep 11, 2:54 AM ET |
| Chicago Cubs @ Milwaukee Brewers · MLB | total 4.5 | Over @ Fliff + Under @ FanDuel | 14.29% | Sep 8, 10:24 PM ET |
| Chicago Cubs @ Milwaukee Brewers · MLB | moneyline | Chicago Cubs @ FanDuel + Milwaukee Brewers @ Fliff | 1.68% | Sep 8, 9:07 PM ET |
| Texas Rangers @ Seattle Mariners · MLB | moneyline | Seattle Mariners @ Fliff + Texas Rangers @ FanDuel | 2.11% | Sep 8, 3:59 PM ET |
| St. Louis Cardinals @ San Francisco Giants · MLB | total 5.5 | Over @ FanDuel + Under @ Fliff | 0.64% | Sep 7, 10:38 PM ET |
| Arizona Diamondbacks @ Kansas City Royals · MLB | moneyline | Arizona Diamondbacks @ Fliff + Kansas City Royals @ FanDuel | 6.98% | Sep 7, 4:31 PM ET |
Frequently asked questions
How often do FanDuel and Fliff disagree?
In the last 30 days our scanner recorded 34 game-markets where FanDuel and Fliff quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 34 scans. The average net edge was 4.83% and the largest 14.95%.
Which has lower vig, FanDuel or Fliff?
FanDuel — FanDuel measures 4.58% overall and Fliff measures 6.23% over 30 days of live lines. The per-market and per-sport breakdown is in the table above.
Does this mean I can make money betting both?
Not automatically. These are measurements of past disagreements at the moment they were detected. Lines move within minutes, displayed prices may not be available at your stake, both books must be accessible in your state, and neither book has to honor a stale price. ArbMonster shows the math; the execution and the risk are yours.
Which sports do FanDuel and Fliff disagree on most?
MLB (34 game-markets, avg 4.83%).
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