Beginning of main content

American Airlines Flights from Ontario (ONT) to Seattle (SEA)

Trip Type
Flight 1
Flight 2
Flight 3
Flight 4
Flight 5
Due to coronavirus (COVID-19) travel advisories, some destinations may be unavailable for certain dates. Find out more.

Wander Wisely with exceptional service, 24/7 support

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Amazing American Airlines ONT to SEA Flight Deals

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were $160 round trip and $83 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Nov 7 -
ONT
Ontario
to
SEA
Seattle
$83

One way

found 7 hours ago

Open ONT to SEA flights search result page
Thu, Jul 8 -
ONT
Ontario
to
SEA
Seattle
$143

One way

just found

Open ONT to SEA flights search result page
Tue, Nov 10 - Tue, Nov 10
ONT
Ontario
to
SEA
Seattle
$160

Roundtrip

found 3 days ago

Open ONT to SEA flights search result page
Wed, Oct 21 - Wed, Oct 28
ONT
Ontario
to
SEA
Seattle
$172

Roundtrip

found 4 days ago

Open ONT to SEA flights search result page
Fri, Nov 6 - Sat, Nov 7
ONT
Ontario
to
SEA
Seattle
$175

Roundtrip

found 4 days ago

Open ONT to SEA flights search result page
Wed, Nov 11 - Wed, Nov 25
ONT
Ontario
to
SEA
Seattle
$177

Roundtrip

found 13 hours ago

Open ONT to SEA flights search result page
Wed, Oct 21 - Wed, Oct 28
ONT
Ontario
to
SEA
Seattle
$172

Roundtrip

found 4 days ago

Open ONT to SEA flights search result page
Sat, Nov 7 -
ONT
Ontario
to
SEA
Seattle
$83

One way

found 7 hours ago

Open ONT to SEA flights search result page
Tue, Nov 10 - Tue, Nov 10
ONT
Ontario
to
SEA
Seattle
$160

Roundtrip

found 3 days ago

Open ONT to SEA flights search result page
Fri, Nov 6 - Sat, Nov 7
ONT
Ontario
to
SEA
Seattle
$175

Roundtrip

found 4 days ago

Open ONT to SEA flights search result page
Wed, Nov 11 - Wed, Nov 25
ONT
Ontario
to
SEA
Seattle
$177

Roundtrip

found 13 hours ago

Open ONT to SEA flights search result page
Thu, Jul 8 -
ONT
Ontario
to
SEA
Seattle
$143

One way

just found

Open ONT to SEA flights search result page

SEA From ONT Economy Coach Packages on Similar Airlines

Save $143
ONT
Los Angeles - Ontario Intl.
to
SEA
Seattle - Tacoma Intl.
Alaska AirlinesEconomy
Courtyard by Marriott Seattle Bellevue/Downtown
3.5 out of 5.0

Mon, Oct 12 - Fri, Oct 16

Old price

$599

The price now is $456 per person
Flight + Hotel
Courtyard by Marriott Seattle Bellevue/Downtown
Save $173
ONT
Los Angeles - Ontario Intl.
to
SEA
Seattle - Tacoma Intl.
Alaska AirlinesEconomy
Renaissance Seattle Hotel
4.5 out of 5.0

Mon, Nov 16 - Fri, Nov 20

Old price

$733

The price now is $560 per person
Flight + Hotel
Renaissance Seattle Hotel
Save $197
ONT
Los Angeles - Ontario Intl.
to
SEA
Seattle - Tacoma Intl.
Alaska AirlinesEconomy
W Seattle
4.5 out of 5.0

Mon, Oct 12 - Fri, Oct 16

Old price

$850

The price now is $653 per person
Flight + Hotel
W Seattle

FAQs about American Airlines Flights from ONT to SEA

What terminal is American Airlines at Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.)?

Before you fly from Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.) to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.) with American Airlines, it's probably a good idea to get in touch with the airline for your terminal information. While your boarding pass should contain some of the details, we can't guarantee it.

Are there American Airlines non-stop flights from ONT to SEA?

You won't find any direct flights with American Airlines from Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.) to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.). You will have at least one stopover, so use this time to go for a stroll and stretch out those legs before catching your next flight.

How long is an American Airlines flight from ONT to SEA?

Throw that book in your carry-on you've been eager to read. A flight from Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.) to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.) with American Airlines will take on average 7 hours and 29 minutes. You'll have more than enough time to completely lose yourself in the absorbing storyline.

How many direct and indirect flights does American Airlines fly from ONT to SEA?

You'll have lots of flexibility if you want to fly with American Airlines between ONT and SEA. Currently, it has at least 5 flights per day on this route.

Flying Tips & Tricks How do I find my flight number?
  • When you've completed your booking, have a look in your inbox for your travel itinerary. Your flight number is written in this document. You shouldn't have too many difficulties spotting it — just keep your eye out for a code made up of numbers and letters. The first one to two letters and single digit are called an IATA airline code and represent the airline you're traveling with. Following this are one, two, three or four numbers which make up your flight number.
How early can you check bags for a flight?
  • Airlines can have varying requirements when it comes to physical check-in and luggage drop times. However, as a general rule, you should arrive at the terminal approximately three hours before takeoff for international flights. If you're flying domestically, the recommended time is two hours prior to takeoff. Our top tip? Don't be too late. International flights typically close bag drop an hour before departure. With domestic flights, it's 45 minutes before.

Popular American Airlines Flight Routes from ONT

Top American Airlines Flight Routes from SEA

Top Flights for American Airlines originating from ONT

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.