Flights from Seattle (SEA) to Ontario (ONT) on Alaska Airlines

Lowest fares from Seattle to Ontario

Nov 2026
From$274*
Seen: 19 hours ago
Flight Type One Way|Saver
Dec 2026
From$119*
Seen: 19 hours ago
Flight Type One Way|Saver
Jan 2027
From$135*
Seen: 19 hours ago
Flight Type One Way|Saver
cmp-daily-histogram-bars-legend-min-price-aria-label $119
cmp-daily-histogram-bars-legend-max-price-aria-label $554
Displaying fares for November-2026
  • SEA–ONT, Nov 14, 2026: From $289
    14

    Sa

    NOV

  • SEA–ONT, Nov 15, 2026: From $318
    15

    Su

  • SEA–ONT, Nov 16, 2026: From $318
    16

    Mo

  • SEA–ONT, Nov 17, 2026: From $289
    17

    Tu

  • SEA–ONT, Nov 18, 2026: From $289
    18

    We

  • SEA–ONT, Nov 19, 2026: From $318
    19

    Th

  • SEA–ONT, Nov 20, 2026: From $318
    20

    Fr

  • SEA–ONT, Nov 21, 2026: From $289
    21

    Sa

  • SEA–ONT, Nov 22, 2026: From $318
    22

    Su

  • SEA–ONT, Nov 23, 2026: From $318
    23

    Mo

  • SEA–ONT, Nov 24, 2026: From $289
    24

    Tu

  • SEA–ONT, Nov 25, 2026: From $353
    25

    We

  • SEA–ONT, Nov 26, 2026: From $274
    26

    Th

  • SEA–ONT, Nov 27, 2026: From $274
    27

    Fr

  • SEA–ONT, Nov 28, 2026: From $353
    28

    Sa

  • SEA–ONT, Nov 29, 2026: From $554
    29

    Su

  • SEA–ONT, Nov 30, 2026: From $279
    30

    Mo

  • SEA–ONT, Dec 1, 2026: From $279
    01

    Tu

    DEC

  • SEA–ONT, Dec 2, 2026: From $279
    02

    We

  • SEA–ONT, Dec 3, 2026: From $119
    03

    Th

  • SEA–ONT, Dec 4, 2026: From $119
    04

    Fr

  • SEA–ONT, Dec 5, 2026: From $119
    05

    Sa

  • SEA–ONT, Dec 6, 2026: From $119
    06

    Su

  • SEA–ONT, Dec 7, 2026: From $119
    07

    Mo

  • SEA–ONT, Dec 8, 2026: From $119
    08

    Tu

  • SEA–ONT, Dec 9, 2026: From $119
    09

    We

  • SEA–ONT, Dec 10, 2026: From $119
    10

    Th

  • SEA–ONT, Dec 11, 2026: From $119
    11

    Fr

  • SEA–ONT, Dec 12, 2026: From $129
    12

    Sa

  • SEA–ONT, Dec 13, 2026: From $129
    13

    Su

    • Range$119-$554

    *Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

    One-way low-fare flights Seattle to Ontario.*

    $
    keyboard_arrow_down
    One-way low-fare flights Seattle to Ontario.*
    From
    To
    Fare Type
    Dates
    Price
    Seattle (SEA)Ontario (ONT)One-way
    |
    Saver    		Depart: Dec 7, 2026

    From

    $119

    Seen: 19 hours ago

    Seattle (SEA)Ontario (ONT)One-way
    |
    Saver    		Depart: Dec 10, 2026

    From

    $119

    Seen: 19 hours ago

    Seattle (SEA)Ontario (ONT)One-way
    |
    Saver    		Depart: Dec 11, 2026

    From

    $119

    Seen: 19 hours ago

    Seattle (SEA)Ontario (ONT)One-way
    |
    Saver    		Depart: Dec 14, 2026

    From

    $119

    Seen: 19 hours ago

    Seattle (SEA)Ontario (ONT)One-way
    |
    Saver    		Depart: Dec 15, 2026

    From

    $119

    Seen: 19 hours ago

    Seattle (SEA)Ontario (ONT)One-way
    |
    Saver    		Depart: Dec 3, 2026

    From

    $119

    Seen: 19 hours ago

    Seattle (SEA)Ontario (ONT)One-way
    |
    Saver    		Depart: Dec 9, 2026

    From

    $119

    Seen: 19 hours ago

    Seattle (SEA)Ontario (ONT)One-way
    |
    Saver    		Depart: Dec 4, 2026

    From

    $119

    Seen: 19 hours ago

    *Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

    Frequently Asked Questions on flights from Seattle (SEA) to Ontario (ONT)

    When is the best time to book a flight from Seattle to Ontario?

    Want to find the lowest fares by day and time flying from Seattle to Ontario on Alaska Airlines or Hawaiian Airlines? Check out our flight search widget.

    Can I earn points on my flight to Ontario?

    Yes, with Atmosâ„¢ Rewards you can earn points on flights to 1000+ destinations worldwide through the growing network of Alaska and Hawaiian Airlines. Not an Atmosâ„¢ Rewards member yet? Learn more and join today.

    Can I rent a car when I arrive at LA/Ontario International Airport?

    Yes, you can rent a car at LA/Ontario International Airport. Check availability and book now

    Where can I find the status of my flight to Ontario?

    You can check the status of your upcoming Alaska Airlines flight on our flight schedule page.

    Where can I find answers to questions about flying with Alaska Airlines?

    Visit the Alaska Airlines Help Center to quickly browse our help pages by category to find the information you need.

    Can I change or cancel my Alaska Airlines flight to Ontario?

    Yes, you can review, modify, or cancel a reservation from our Manage Your Reservation tool. You can learn more about our policy for changing or cancelling a reservation here. 

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