Cheap Flights from Ontario, CA to Seattle, WA from $59

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On Cheapflightsplus.com you will find 10 direct and 179 connecting flights from Ontario to Seattle. You can compare airfare deals from 6 airlines and multiple travel sites from $59, 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: $59 (one-way), $101 (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 $59. The fastest direct flight takes 2h 45m and the fastest connecting – 4h 11m.

Price	Departure	Arrival	Flight Duration	Airline	Flight
from $59 Find flight	10:06 Ontario Ontario Int.	12:53 Seattle Seattle-Tacoma Intl	2h 47m	Frontier Airlines	F93164
from $132 Find flight	11:57 Ontario Ontario Int.	14:44 Seattle Seattle-Tacoma Intl	2h 47m	Alaska Airlines	AS1255
from $156 Find flight	20:59 Ontario Ontario Int.	23:44 Seattle Seattle-Tacoma Intl	2h 45m	Alaska Airlines	AS1007
from $185 Find flight	16:15 Ontario Ontario Int.	19:00 Seattle Seattle-Tacoma Intl	2h 45m	Alaska Airlines	AS1099
from $280 Find flight	18:30 Ontario Ontario Int.	21:15 Seattle Seattle-Tacoma Intl	2h 45m	Alaska Airlines	AS1399
from $332 Find flight	14:19 Ontario Ontario Int.	17:08 Seattle Seattle-Tacoma Intl	2h 49m	Alaska Airlines	AS1119
from $62 Find flight	00:49 Ontario Ontario Int.	08:37 Seattle Seattle-Tacoma Intl	7h 48m layover 2h 25m - Denver	Frontier Airlines	F91500 F91175
from $65 Find flight	20:59 Ontario Ontario Int.	08:50+1 день Seattle Seattle-Tacoma Intl	11h 51m layover 7h 52m - Las Vegas	Frontier Airlines	F94206 F92407
from $65 Find flight	15:56 Ontario Ontario Int.	08:57+1 день Seattle Seattle-Tacoma Intl	17h 1m layover 12h 51m - Las Vegas	Frontier Airlines	F92232 F92407
from $65 Find flight	08:04 Ontario Ontario Int.	08:57+1 день Seattle Seattle-Tacoma Intl	24h 53m layover 20h 48m - Las Vegas	Frontier Airlines	F94758 F92407
from $78 Find flight	11:20 Ontario Ontario Int.	19:27 Seattle Seattle-Tacoma Intl	8h 7m layover 2h 38m - Denver	Frontier Airlines	F91262 F93405
from $90 Find flight	06:57 Ontario Ontario Int.	16:31 Seattle Seattle-Tacoma Intl	9h 34m layover 2h 15m - Dallas	Frontier Airlines	F91406 F94065
from $93 Find flight	17:44 Ontario Ontario Int.	22:00 Seattle Seattle-Tacoma Intl	4h 16m layover 0h 57m - Portland	Alaska Airlines	AS3498 AS2113
from $93 Find flight	11:14 Ontario Ontario Int.	15:59 Seattle Seattle-Tacoma Intl	4h 45m layover 1h 22m - Portland	Alaska Airlines	AS3312 AS2355
from $93 Find flight	11:45 Ontario Ontario Int.	16:55 Seattle Seattle-Tacoma Intl	5h 10m layover 1h 42m - Portland	Alaska Airlines	AS3312 AS2102
from $96 Find flight	20:27 Ontario Ontario Int.	08:37+1 день Seattle Seattle-Tacoma Intl	12h 10m layover 6h 36m - Denver	Frontier Airlines	F92908 F91175

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*Departure and arrival times - local. Prices indicated for one-way flights. Information updated on March 13, 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 — 08:49	06:00 — 08:49 AS1091 Alaska Airlines Ontario — Seattle	2h 49m	Find flight from$132
10:06 — 12:53	10:06 — 12:53 F93164 Frontier Airlines Ontario — Seattle	2h 47m	Find flight from$59
10:48 — 13:41	10:48 — 13:41 AS1165 Alaska Airlines Ontario — Seattle	2h 53m	Find flight from$163
11:57 — 14:44	11:57 — 14:44 AS1255 Alaska Airlines Ontario — Seattle	2h 47m	Find flight from$132
14:19 — 17:08	14:19 — 17:08 AS1119 Alaska Airlines Ontario — Seattle	2h 49m	Find flight from$332
16:15 — 19:00	16:15 — 19:00 AS1099 Alaska Airlines Ontario — Seattle	2h 45m	Find flight from$185
18:10 — 21:00	18:10 — 21:00 AS2143 Alaska Airlines Ontario — Seattle	2h 50m	Find flight from$192
18:10 — 21:00	18:10 — 21:00 AS2315 Alaska Airlines Ontario — Seattle	2h 50m	Find flight from$338
18:30 — 21:15	18:30 — 21:15 AS1399 Alaska Airlines Ontario — Seattle	2h 45m	Find flight from$280
20:59 — 23:44	20:59 — 23:44 AS1007 Alaska Airlines Ontario — Seattle	2h 45m	Find flight from$156
00:49 — 08:37	06:30 — 09:54 F91500 Frontier Airlines Ontario — Denver 2h 25m stop 06:00 — 08:15 F91175 Frontier Airlines Denver — Seattle	7h 48m including layover	Find flight from$62
06:30 — 19:27	06:30 — 09:54 F91500 Frontier Airlines Ontario — Denver 7h 23m stop 17:18 — 19:28 F93405 Frontier Airlines Denver — Seattle	12h 57m including layover	Find flight from$84
06:57 — 16:31	06:57 — 12:11 F91406 Frontier Airlines Ontario — Dallas 2h 15m stop 14:26 — 16:31 F94065 Frontier Airlines Dallas — Seattle	9h 34m including layover	Find flight from$90
07:00 — 12:41	07:00 — 09:33 AS1058 Alaska Airlines Ontario — Portland 2h 14m stop 11:45 — 12:46 AS970 Alaska Airlines Portland — Seattle	5h 41m including layover	Find flight from$115
07:00 — 12:52	07:00 — 09:22 AS123 Alaska Airlines Ontario — Portland 2h 24m stop 11:49 — 12:55 AS970 Alaska Airlines Portland — Seattle	5h 52m including layover	Find flight from$115
08:04 — 08:57 +1 day	08:04 — 09:12 F94758 Frontier Airlines Ontario — Las Vegas 20h 48m stop 06:00 — 08:57 F92407 Frontier Airlines Las Vegas — Seattle	24h 53m including layover	Find flight from$65
10:39 — 15:45	10:39 — 12:20 UA4639 United Airlines Ontario — San Francisco 1h 5m stop 13:25 — 15:45 UA593 United Airlines San Francisco — Seattle	5h 6m including layover	Find flight from$147
11:20 — 07:15 +1 day	10:55 — 14:18 F91262 Frontier Airlines Ontario — Denver 14h 25m stop 06:00 — 08:15 F91175 Frontier Airlines Denver — Seattle	19h 55m including layover	Find flight from$62
11:20 — 19:27	10:55 — 14:18 F91262 Frontier Airlines Ontario — Denver 2h 38m stop 17:18 — 19:28 F93405 Frontier Airlines Denver — Seattle	8h 7m including layover	Find flight from$78
13:55 — 18:41	13:55 — 15:26 UA5920 United Airlines Ontario — San Francisco 57m stop 16:23 — 18:41 UA2603 United Airlines San Francisco — Seattle	4h 46m including layover	Find flight from$191
13:55 — 21:07	13:55 — 15:26 UA5920 United Airlines Ontario — San Francisco 3h 24m stop 18:50 — 21:07 UA2019 United Airlines San Francisco — Seattle	7h 12m including layover	Find flight from$191
15:15 — 21:07	15:15 — 16:48 UA5645 United Airlines Ontario — San Francisco 2h 2m stop 18:50 — 21:07 UA2019 United Airlines San Francisco — Seattle	5h 52m including layover	Find flight from$191
15:56 — 08:57 +1 day	15:56 — 17:09 F92232 Frontier Airlines Ontario — Las Vegas 12h 51m stop 06:00 — 08:57 F92407 Frontier Airlines Las Vegas — Seattle	17h 1m including layover	Find flight from$65
17:44 — 22:00	17:44 — 20:10 AS3498 Alaska Airlines Ontario — Portland 57m stop 21:07 — 22:00 AS2113 Alaska Airlines Portland — Seattle	4h 16m including layover	Find flight from$93
17:44 — 16:00 +1 day	17:44 — 20:10 AS3498 Alaska Airlines Ontario — Portland 18h 50m stop 15:00 — 16:00 AS3358 Alaska Airlines Portland — Seattle	22h 16m including layover	Find flight from$174
18:28 — 23:44	18:28 — 20:01 UA5429 United Airlines Ontario — San Francisco 1h 28m stop 21:29 — 23:44 UA1971 United Airlines San Francisco — Seattle	5h 16m including layover	Find flight from$191
19:15 — 00:55 +1 day	19:15 — 20:44 UA1757 United Airlines Ontario — San Francisco 1h 51m stop 22:35 — 00:55 UA1743 United Airlines San Francisco — Seattle	5h 40m including layover	Find flight from$161
19:44 — 06:03 +1 day	19:44 — 22:08 AS1066 Alaska Airlines Ontario — Portland 6h 52m stop 05:00 — 06:03 AS1032 Alaska Airlines Portland — Seattle	10h 19m including layover	Find flight from$196
20:27 — 08:37 +1 day	18:13 — 21:35 F92908 Frontier Airlines Ontario — Denver 6h 36m stop 06:00 — 08:15 F91175 Frontier Airlines Denver — Seattle	12h 10m including layover	Find flight from$96
20:59 — 08:50 +1 day	18:44 — 19:53 F94206 Frontier Airlines Ontario — Las Vegas 7h 52m stop 15:32 — 18:26 F92407 Frontier Airlines Las Vegas — Seattle	11h 51m including layover	Find flight from$65

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

*Departure and arrival times - local. Updated on March 13, 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 00:49 to 22:30 from 2 Ontario airports and arrive 00:49 to 22:30 to 3 Seattle airports. Average flight time is 2h 48m.

The fastest flight 2h 45m
Average flight time 2h 48m
The earliest flight 00:49
The latest flight 22:30
Distance 957 ml

The cheapest months to travel to Seattle are january (from 59 $), february (from 61 $), november (from 62 $).

The most expensive months are december (from 65 $), november (from 62 $), february (from 61 $).

What is the lowest airfare Ontario to Seattle?

The cheapest plane ticket found by our users is $59. This airfare is for economy class on one-way F93164 flight by Frontier Airlines for February 21, 2025 which leaves Ontario Int. in Ontario at 10:06 am and arrives at Seattle Seattle-Tacoma Intl at 12:53.

Economy class

$59

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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 6 regular airlines and 2 low-cost airlines. Most of the flights on this route are operated by Alaska Airlines - 82 departures per week at the price of from $ 93 . And the most expensive tickets are offered by Avianca airline - from $ 1464.

Direct flights

There are 10 nonstop flights on the route. The fastest direct flight is AS1007 by Alaska Airlines takes 2h 45m and the cheapest is F93164 by Frontier Airlines for $59.

AS - Alaska Airlines

from $132

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F9 - Frontier Airlines

from $59

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Connecting Flights

There are 179 flights with layovers on the route. The fastest connecting flight is AS123 by Alaska Airlines takes 4h 11m and the cheapest is F93164 by Frontier Airlines for $62.

AS - Alaska Airlines

from $93

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F9 - Frontier Airlines

from $62

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AV - Avianca

from $1464

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HA - Hawaiian Airlines

from $415

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Y4 - Volaris

from $446

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UA - United Airlines

from $146

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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 $59
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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 6 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

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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?

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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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