Flights from Ontario/LA, CA to Chicago, IL

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Best Deals on Flights From Ontario/LA, CA (ONT) to Chicago, IL (ORD)

Try alternate month or interact with individual days below in order to find offers.
Sep 2026
No results for this month.
Oct 2026
from$85*
Last seen: 13 hours ago
One-way/Economy
Nov 2026
from$85*
Last seen: 20 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $85
cmp-daily-histogram-bars-legend-max-price-aria-label $193
Displaying fares for September-2026
  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    29

    Tue

    SEP

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    30

    Wed

  • ONT–ORD, Oct 1, 2026: from $128
    01

    Thu

    OCT

  • ONT–ORD, Oct 2, 2026: from $128
    02

    Fri

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    03

    Sat

  • ONT–ORD, Oct 4, 2026: from $128
    04

    Sun

  • ONT–ORD, Oct 5, 2026: from $128
    05

    Mon

  • ONT–ORD, Oct 6, 2026: from $128
    06

    Tue

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    07

    Wed

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    08

    Thu

  • ONT–ORD, Oct 9, 2026: from $128
    09

    Fri

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    10

    Sat

  • ONT–ORD, Oct 11, 2026: from $193
    11

    Sun

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    12

    Mon

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    13

    Tue

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    14

    Wed

  • ONT–ORD, Oct 15, 2026: from $128
    15

    Thu

  • ONT–ORD, Oct 16, 2026: from $128
    16

    Fri

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    17

    Sat

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    18

    Sun

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    19

    Mon

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    20

    Tue

  • ONT–ORD, Oct 21, 2026: from $85
    21

    Wed

  • ONT–ORD, Oct 22, 2026: from $85
    22

    Thu

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    23

    Fri

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    24

    Sat

  • ONT–ORD, Oct 25, 2026: from $91
    25

    Sun

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    26

    Mon

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    27

    Tue

  • ONT–ORD: cmp-view-offers-disclaimer. Find Offers
    28

    Wed

    • Range$85-$193

    *Prices found by others in the previous 48 hours for round-trip flights. Prices shown may also require membership in our travel club, Discount Den.

    Flights Deals from Ontario/LA, CA to Chicago, IL on Frontier

    $
    Flights Deals from Ontario/LA, CA to Chicago, IL on Frontier
    From
    To
    Ontario/LA, CA (ONT)Chicago, IL (ORD)One-way
    /
    Discount Den Basic Fare    		Departing Feb 25, 2027

    From

    $153

    Last seen: 12 hours ago

    *Prices found by others in the previous 48 hours for one-way flights. Prices shown may also require membership in our travel club, Discount Den®.

    Ontario/LA, CA Chicago, IL

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