Cheap Flights from Ontario, CA to Seattle, WA from $68

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On Cheapflightsplus.com you will find 13 direct and 130 connecting flights from Ontario to Seattle. You can compare airfare deals from 4 airlines and multiple travel sites from $68, book and save on cheap plane tickets and last minute offers. Also check out ONT-SEA flight schedule to find best flight time, convenient departure and arrival airports.

Find One-Way and Round-Trip Ontario to Seattle Flight Deals

To find the cheapest one way airline ticket select the date with the lowest price on the calendar below and click «Find Flights». To search for round-trip flight deals click on the link «Check prices for return flights» and select the date of the return flight. Cheapest flights in November: $68 (one-way), $117 (round-trip).

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Best Flights from Ontario to Seattle Today

Take a look at the list of non stop flights and flights with layovers from Ontario to Seattle with the lowest price of $68. The fastest direct flight takes 2h 37m and the fastest connecting – 3h 44m.

Price	Departure	Arrival	Flight Duration	Airline	Flight
from $71 Find flight	10:03 Ontario Ontario Int.	12:49 Seattle Seattle-Tacoma Intl	2h 46m	Frontier Airlines	F93164
from $84 Find flight	17:03 Ontario Ontario Int.	19:57 Seattle Seattle-Tacoma Intl	2h 54m	Frontier Airlines	F92275
from $86 Find flight	14:21 Ontario Ontario Int.	16:58 Seattle Seattle-Tacoma Intl	2h 37m	Hawaiian Airlines	HA6307
from $68 Find flight	06:00 Ontario Ontario Int.	14:06 Seattle Seattle-Tacoma Intl	8h 6m layover 4h 1m - Las Vegas	Frontier Airlines	F92232 F92407
from $87 Find flight	18:11 Ontario Ontario Int.	00:31+1 день Seattle Seattle-Tacoma Intl	6h 20m layover 0h 56m - Denver	Frontier Airlines	F92908 F93405

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*Departure and arrival times - local. Prices indicated for one-way flights. Information updated on September 15, 2025

Flight Schedule Ontario (California) to Seattle (Washington)

Full flight schedule will help you in detecting at what time planes fly from Ontario to Seattle. You can also specify the concrete flights and airlines on the route and how long the flight actually is. Use the calendar for today, tomorrow or other specific date as some flights are available only on certain days of the week.

Departure	Flight Details	Flight Duration	Price
06:00 — 14:06	15:56 — 17:09 F92232 Frontier Airlines Ontario — Las Vegas 4h 1m stop 06:00 — 08:57 F92407 Frontier Airlines Las Vegas — Seattle	8h 6m including layover	Find flight from$68
06:00 — 08:42	06:00 — 08:42 HA6288 Hawaiian Airlines Ontario — Seattle	2h 42m	Find flight from$86
06:00 — 08:42	06:00 — 08:42 AS1091 Alaska Airlines Ontario — Seattle	2h 42m	Find flight from$91
10:03 — 12:49	10:03 — 12:49 F93164 Frontier Airlines Ontario — Seattle	2h 46m	Find flight from$71
12:00 — 14:38	12:00 — 14:38 AS1111 Alaska Airlines Ontario — Seattle	2h 38m	Find flight from$110
12:00 — 14:38	12:00 — 14:38 HA6289 Hawaiian Airlines Ontario — Seattle	2h 38m	Find flight from$126
14:21 — 16:58	14:21 — 16:58 HA6307 Hawaiian Airlines Ontario — Seattle	2h 37m	Find flight from$86
14:21 — 16:58	14:21 — 16:58 AS1242 Alaska Airlines Ontario — Seattle	2h 37m	Find flight from$91
15:04 — 17:44	15:04 — 17:44 HA6290 Hawaiian Airlines Ontario — Seattle	2h 40m	Find flight from$86
15:04 — 17:44	15:04 — 17:44 AS1119 Alaska Airlines Ontario — Seattle	2h 40m	Find flight from$90
17:03 — 19:57	17:03 — 19:57 F92275 Frontier Airlines Ontario — Seattle	2h 54m	Find flight from$84
18:11 — 00:31 +1 day	18:13 — 21:35 F92908 Frontier Airlines Ontario — Denver 56m stop 17:17 — 19:27 F93405 Frontier Airlines Denver — Seattle	6h 20m including layover	Find flight from$87
18:58 — 21:37	18:58 — 21:37 AS1087 Alaska Airlines Ontario — Seattle	2h 39m	Find flight from$100
18:58 — 21:37	18:58 — 21:37 HA6287 Hawaiian Airlines Ontario — Seattle	2h 39m	Find flight from$126
19:25 — 22:05	19:25 — 22:05 AS1399 Alaska Airlines Ontario — Seattle	2h 40m	Find flight from$89

Departure	Arrival	Flight Details	Flight Time	Price
		stop stop	including layover	Find flight from$

*Departure and arrival times - local. Updated on September 15, 2025

Flight Information

Below we will explain in detail what the flights cost on the destination from Ontario to Seattle depends on and how to choose the most interesting flight option for you.

Distance between Ontario and Seattle is 1540 miles. Time difference between the cities is 0h. Airplanes depart 00:59 to 20:09 from 2 Ontario airports and arrive 00:59 to 20:09 to 3 Seattle airports. Average flight time is 2h 40m.

The fastest flight 2h 37m
Average flight time 2h 40m
The earliest flight 00:59
The latest flight 20:09
Distance 957 ml

The cheapest months to travel to Seattle are december (from 68 $), september (from 68 $), august (from 71 $).

The most expensive months are february (from 234 $), november (from 138 $), october (from 89 $).

What is the lowest airfare Ontario to Seattle?

The cheapest plane ticket found by our users is $68. This airfare is for economy class on one-way F92232 flight by Frontier Airlines for September 20, 2025 which leaves Ontario Int. in Ontario at 06:00 am and arrives at Seattle Seattle-Tacoma Intl at 14:06.

Economy class

$68

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Business class

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First class

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Popular Airlines on the Route

The flight Ontario — Seattle is served by 4 regular airlines and 1 low-cost airline. Most of the flights on this route are operated by Alaska Airlines - 49 departures per week at the price of from $ 89 . And the most expensive tickets are offered by United Airlines airline - from $ 542.

Direct flights

There are 13 nonstop flights on the route. The fastest direct flight is HA6307 by Hawaiian Airlines takes 2h 37m and the cheapest is F92232 by Frontier Airlines for $71.

AS - Alaska Airlines

from $89

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F9 - Frontier Airlines

from $71

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HA - Hawaiian Airlines

from $86

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Connecting Flights

There are 130 flights with layovers on the route. The fastest connecting flight is AS2202 by Alaska Airlines takes 3h 44m and the cheapest is F92232 by Frontier Airlines for $68.

AS - Alaska Airlines

from $99

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F9 - Frontier Airlines

from $68

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HA - Hawaiian Airlines

from $92

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UA - United Airlines

from $118

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Airports

You can fly from Ontario to Seattle from 2 airports (Ontario Int., International Heliport).

Ontario airports

Ontario Int.-ONT

from $68
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International Heliport-JIO

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Seattle airports

Boeing Field International Airport-BFI

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Seattle-Tacoma Intl-SEA

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Kenmore Air Harbor SPB-LKE

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Airplanes

There are flights to Seattle from Ontario by 4 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.

Top Domestic Destinations from Ontario

You may also consider searching for discounted plane tickets to some other popular places from Ontario within United States.

Ontario — Phoenix

from $56

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Ontario — Denver

from $65

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Ontario — Austin

from $67

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Ontario — Miami

from $62

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Ontario — Tucson

from $80

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Ontario — Las Vegas

from $63

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Ontario — Seattle

from $65

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Ontario — Boise

from $70

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Ontario — Chicago

from $78

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Ontario — Philadelphia

from $62

Find

Top International Destinations from Ontario

Our state-of-the art metasearch will definitely provide you with the best airfare on international flights. We’re proud to partner with many reliable travel suppliers located outside the US what gives us an opportunity to offer the most competitive prices on far destinations.

Ontario — London

from $62

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Ontario — San Jose

from $61

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Ontario — Guadalajara

from $70

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Ontario — Cancun

from $74

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How to book a plane ticket yourself?

Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
Click «Buy» when you are ready — our system will redirect you to the site that sells the selected flight ticket.
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That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.
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