2018Final results
2018 election for California's 31st District
U.S. House · California
Pete Aguilar (D) won with 58.7% of the vote, defeating Sean Flynn (R) by 17.5 points.
Pete AguilarDemocrat · winner
58.7%110,143
Sean FlynnRepublican
41.3%77,352
187,495 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Pete AguilarSean Flynn
$2.8M
Raised by the campaign
$1.4M
$2.5M
Spent by the campaign
$1.4M
$1.2M
Cash on hand
$1.4K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018