Will Eagles, Chiefs pile up points in Arizona? Here’s what the trends say.

The Super Bowl 57 point spread has been pinging up and down throughout the week.

After the Chiefs opened as a 2.5-point favorite, the line swung as far as Eagles -2.5 before settling at Eagles -2. Then in the last two days, Kansas City money has flooded the market, dropping the number to the current consensus of Eagles -1.5.

But while the point spread has been yo-yoing, the Over/Under has resembled a bullish stock — it just keeps going up and up and up.

Since opening as low as 48.5 in some spots, the Super Bowl 57 total is now 50.5. And the climb likely isn’t over.

Makes sense, though, right? Kansas City and Philadelphia ranked first and third, respectively, in scoring offense this year.

But what if we told you that the Chiefs and Eagles are on a combined 9-3 Under run? And that the Over hasn’t hit in a Super Bowl since the last time Philadelphia was involved five years ago?

We address these topics and others — including how favorites and underdogs have fared historically in the Big Game — in our Super Bowl 57 betting trends report.

At one point during the season — a 10-game stretch, to be exact — betting the Over in Eagles games was akin to printing money.

From a 29-21 Week 4 home victory over Jacksonville to a 48-22 Week 14 drubbing of the Giants in New York, Philadelphia went 8-2 to the Over.

Then quarterback Jalen Hurts injured his shoulder in Chicago in Week 15, and it’s been a steady stream of Unders for the Eagles ever since.

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Starting with its 25-20 victory over the Bears (47.5-point total), Philadelphia has stayed Under the total in five of the last six games. That includes four straight Unders overall and four straight that Hurts has started.

Only one time during this six-game stretch — a 40-34 loss at Dallas in Week 16 — did the Eagles and their opponent combine for more than 45 points.

In fact, that Cowboys’ defeat is one of only five Philly games that have ended with more than 50 total points.

Kansas City, meanwhile, enters the Super Bowl on a 4-1 Under surge, with its last three in a row failing to reach the total. The results of those four recent low-scoring games (all Chiefs victories): 24-10 (Seahawks), 31-13 (Raiders), 27-20 (Jaguars) and 23-20 (Bengals).

K.C.’s only Over since beating Seattle on Christmas Day? A 27-24 Week 17 home win over Denver.

Overall, the Under is 11-8 in Chiefs games (playoffs included). And Kansas City and its opponents have combined for more than 51 points seven times (although three other games landed right on 51).

Additionally, the Under cashed in both of the Chiefs’ recent Super Bowl appearances. Super Bowl 54 (31-20 victory over San Francisco) stayed below the 53-point closing total, while Super Bowl 55 (31-9 loss to Tampa Bay) never threatened the 55-point total.

Kansas City’s championship games against the 49ers and Bucs are part of an ongoing 4-0 Under streak in the Super Bowl.

The last time Over bettors cashed in the big game? Super Bowl 58 in February 2018, when the Eagles beat the Patriots 41-33.

That thriller easily hurdled the 49-point closing total and capped a 5-1 Over run in Super Bowls. The five games that topped the number finished with 74, 62 (overtime), 52, 51 and 65 points.

What about when a Super Bowl total closes at 50 points or higher? The Under is 9-4, including 7-1 going back to Super Bowl 36 in 2001-02.

That year, Tom Brady and the Patriots beat the then-St. Louis Rams 20-17 for their first championship. The game had a 53-point total.

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Also worth noting when it comes to the Eagles vs. Chiefs total: Philadelphia has not played in a game with a total in the 50s all season. And in the team’s seven games with a total between 47.5 and 49.5, the Under is 5-2.

Meanwhile, Kansas City played an NFL-high 11 games with totals of 50.5 points or higher. The Under went 8-3.

As for the current run of four straight Unders in Super Bowls: We haven’t seen five consecutive title games fall short of the total since a seven-year Under run from Super Bowl 3 to Super Bowl 9 (1969-1975).

As expected, the short point spreads in last week’s NFC and AFC Championship Games didn’t come into play — the Eagles hammered San Francisco 31-7 as a 3-point home favorite; Kansas City beat Cincinnati 23-20 as a 2-point chalk on a last-second field goal.

Over the course of the season, the Chiefs are 6-3 SU but 1-8 ATS in games decided by four points or fewer. The lone spread-cover was against the Bengals last week.

Only one of those tight games was decided by a single point: A 30-29 home win over the Raiders in Week 5.

Philadelphia opened the season with a 38-35 victory at Detroit as a 5.5-point road chalk. After that, though, the Eagles played just two games decided by fewer than five points.

One was a 20-17 win at Arizona as a 5.5-point favorite in Week 5, the other a 17-16, last-minute win at Indianapolis as a 6.5-point favorite in Week 11.

Other interesting Eagles vs. Chiefs point spread facts:

That result against the Bills in Week 6? It’s the only time in nine career games that Mahomes has failed to cover the spread as an underdog. He’s 6-3 SU and 7-1-1 ATS when catching points — all in the regular season.

That’s right: Super Bowl 57 will be the first time in Mahomes’ 14 playoff contests that he and the Chiefs will be an underdog.

» READ MORE: Full sports betting coverage from The Philadelphia Inquirer

Finally, some Super Bowl history as it pertains to favorites and underdogs — starting with one trend that should make Eagles fans happy.

Favorites have won 64% of all Super Bowls, going 36-20 SU. That comes with a dead-even 27-27-2 ATS record.

However, not including Super Bowl 49 — that Seahawks-Patriots clash went off as a pick-em — the Super Bowl underdog is on a 8-6 SU and 10-4 ATS run.

During this span — again, not including Seahawks-Patriots — four Super Bowls have gone off with a point spread of less than 3 points.

The underdog won and covered the first two: The Giants (+2.5) beat New England 21-17 in Super Bowl 46; the Seahawks (+2.5) blasted Denver 43-9 in Super Bowl 48.

However, the favorite has gotten the job done in the last two: New England (-2.5) beat the Rams 13-3 in Super Bowl 53 and Kansas City (-1.5) upended the 49ers 31-20 in Super Bowl 54.

Finally, if history is any measure, there’s little chance the Eagles vs. Chiefs point spread will be a factor come Super Sunday. Because only one of 56 Super Bowls has been decided by fewer than three points: In January 1991, the Giants upset Buffalo 20-19 as a 7-point underdog.

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