How do most travelers feel about Frontier?

4,110 Cheapflights users have left reviews for Frontier and have rated the airline 6.2/10. If you are looking to travel from Ontario to Seattle on Frontier, input your dates in the form above for our best prices!

Can I get a flight from Ontario to Seattle on Frontier for under $300?

Cheapflights users have found 50 Frontier flights for under $300 on the ONT-SEA route. Prices on flights to Seattle from Ontario can vary based on many factors including dates. To look at price based on your preferred dates, click here.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Fly Frontier from ONT to SEA as low as $23

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Cheapflights users flying from Ontario to Seattle on Frontier typically fly into Seattle/Tacoma Intl and depart from Ontario. Select your dates above for pricing.

Frontier flights from Ontario to Seattle in 2024

Popular in	June
Cheapest in	January
Average price (all airlines)	$218
One-way from	$23
Round-trip from	$52

Highest demand for flights from Ontario to Seattle/Tacoma Intl; 10% potential price increase.

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Best time to find cheap flights from Ontario to Seattle/Tacoma Intl; 1% potential price drop.

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Average price for all Ontario to Seattle/Tacoma Intl flights (one-way and round-trip).

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Cheapest one-way Frontier flight from Ontario to Seattle/Tacoma Intl

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Cheapest round-trip Frontier flight from Ontario to Seattle/Tacoma Intl

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Can I get a flight from Ontario to Seattle on Frontier for under $300?
Cheapflights users have found 50 Frontier flights for under $300 on the ONT-SEA route. Prices on flights to Seattle from Ontario can vary based on many factors including dates. To look at price based on your preferred dates, click here.
How do most travelers feel about Frontier?
4,110 Cheapflights users have left reviews for Frontier and have rated the airline 6.2/10. If you are looking to travel from Ontario to Seattle on Frontier, input your dates in the form above for our best prices!

Cheapest Frontier flights from Ontario to Seattle

Wed 5/2210:04 amONT - SEA

Nonstop2h 53mFrontier

Wed 5/291:57 pmSEA - ONT

Nonstop2h 44mFrontier

Deal found 5/2$52

Pick Dates

Tue 6/410:04 amONT - SEA

Nonstop2h 53mFrontier

Wed 6/52:22 pmSEA - ONT

Nonstop2h 44mFrontier

Deal found 5/2$58

Pick Dates

Tue 5/2110:04 amONT - SEA

Nonstop2h 53mFrontier

Wed 5/221:57 pmSEA - ONT

Nonstop2h 44mFrontier

Deal found 5/1$60

Pick Dates

Direct flights from Ontario to Seattle on Frontier

Wed 5/2210:04 amONT - SEA

Nonstop2h 53mFrontier

Wed 5/291:57 pmSEA - ONT

Nonstop2h 44mFrontier

Deal found 5/2$52

Pick Dates

Tue 6/410:04 amONT - SEA

Nonstop2h 53mFrontier

Wed 6/52:22 pmSEA - ONT

Nonstop2h 44mFrontier

Deal found 5/2$58

Pick Dates

Tue 5/2110:04 amONT - SEA

Nonstop2h 53mFrontier

Wed 5/221:57 pmSEA - ONT

Nonstop2h 44mFrontier

Deal found 5/1$60

Pick Dates

Last minute deals on Cheapflights

Sat 5/1110:57 pmONT - SEA

1 stop9h 38mFrontier

Sat 5/181:57 pmSEA - ONT

Nonstop2h 44mFrontier

Deal found 5/2$124

Pick Dates

Fri 5/1012:55 amONT - SEA

1 stop13h 00mFrontier

Sat 5/181:57 pmSEA - ONT

Nonstop2h 44mFrontier

Deal found 5/2$138

Pick Dates

Thu 5/98:07 pmONT - SEA

1 stop23h 23mFrontier

Tue 5/1410:44 amSEA - ONT

1 stop9h 03mFrontier

Deal found 5/2$148

Pick Dates

One-way Frontier flights to Seattle from Ontario

Wed 5/2210:04 amONT - SEA

Nonstop2h 53mFrontier

Deal found 5/2$23

Pick Dates

Wed 5/2910:04 amONT - SEA

Nonstop2h 53mFrontier

Deal found 5/2$29

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Wed 8/149:50 amONT - SEA

Nonstop2h 47mFrontier

Deal found 5/2$34

Pick Dates

Average price of Frontier flights from Ontario to Seattle

Currently, the most affordable month to book a Frontier flight from Ontario to Seattle in December, with an average price of $245. Conversely, traveling with Frontier from Ontario to Seattle in July will be the most expensive, with an average cost of $408. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

January

$247

February

$254

March

$288

April

$294

May

$320

June

$406

July

$408

August

$343

September

$278

October

$257

November

$258

December

$245

Temperature and rainfall in Seattle by month

SEA Temperature	41 - 66.2 °F

SEA

Temperature

41 - 66.2 °F

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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Fly from Ontario to Seattle on another airline
Consider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Alaska Airlines flights from Ontario to Seattle/Tacoma Intl

Delta flights from Ontario to Seattle/Tacoma Intl

Complete your trip
Complete your trip to Seattle by adding a car rental and/or hotel reservation to your travel itinerary.

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Other popular destinations in North America
If Seattle is not for you, choose from these other destinations located in North America. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Flights to New York

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Flights to San Francisco

Popular flights with Frontier
Browse through some of the most popular routes that Frontier offers at this time. Flights are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Frontier flights from San Francisco to Las Vegas

Frontier flights from Denver to Las Vegas

Frontier flights from Philadelphia to Luis Munoz Marin Intl

Frontier flights from Philadelphia to Orlando

Frontier flights from Dallas/Fort Worth to Denver

Frontier flights from Dallas/Fort Worth to Las Vegas

Frontier flights from Denver to Sky Harbor Intl

Frontier flights from Philadelphia to Tampa

Frontier flights from Philadelphia to Orlando

Frontier flights from Minneapolis to Denver

Frontier flights from Atlanta to Cancún

Frontier flights from Hartford to Luis Munoz Marin Intl

Frontier flights from San Francisco to Sky Harbor Intl

Frontier flights from Washington, D.C. to Denver

Frontier flights from Sky Harbor Intl to Denver

Frontier flights from Atlanta to Denver

Frontier flights from Atlanta to Miami

Frontier flights from Sky Harbor Intl to Las Vegas

Frontier flights from Philadelphia to Atlanta

Frontier flights from Philadelphia to Miami

Frontier flights from Cleveland to Las Vegas

Frontier flights from Orlando to Luis Munoz Marin Intl

Frontier flights from San Francisco to Denver

Frontier flights from Denver to San Diego

Frontier flights from Cleveland to Tampa

Frontier flights from Chicago to Sky Harbor Intl

Frontier flights from Atlanta to Las Vegas

Frontier flights from Miami to Luis Munoz Marin Intl

Frontier flights from Denver to Cancún

Frontier flights from Denver to Dallas/Fort Worth

See what others are saying about Frontier

Frontier

6.2

Okay

4,110 reviews

Check prices

Overview

Recent reviews

2.0

Poor|Jan 2022

I never even booked this flight

10.0

Wonderful|Mar 2018

price was right

maybe a little cramped

10.0

Wonderful|Jan 2022

Left on time, arrived early, easy boarding process, comfortable seats for a short flight. Can't beat the price.

8.0

Very good|Jun 2023

Better seat cushions... Staff was awesome

6.0

Okay|Mar 2022

We paid $47 to check one carefully packed 50 lb bag on the way. Our return trip, they charged $65 for the base fee and only then chose to inform us that we would be required to pay an extra ONE HUNDRED DOLLARS - total of $165 one way! A because, since our departure, they had reduced the permissible weight to 40 lbs. ONE HUNDRED ADDITIONAL DOLLARS FOR LESS THAN TEN POUNDS WHEN WE WERE TOLD 50 LBS WAS THE LIMIT. I know their fares are cheap but my lord, their seats are tiny, they nickel and dime EVERYTHING, and they legit steal from you by changing the rules and price-gouging. Gross. I’ll pay more on the front end next time, because at those prices I could’ve flown a non-budget airline and been comfortable and had a damn complimentary water.

1 out of 1370

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Cheapflights users flying from Ontario to Seattle on Frontier typically fly into Seattle/Tacoma Intl and depart from Ontario. Select your dates above for pricing.

Frontier flights from Ontario to Seattle in 2024

Find detailed information about Frontier flights from Ontario to Seattle. Explore the options provided by Frontier to plan your journey from Ontario to Seattle. Data last updated May 2, 2024.

Popular in

Cheapest in

Average price (all airlines)

One-way from

Round-trip from

Can I get a flight from Ontario to Seattle on Frontier for under $300?

How do most travelers feel about Frontier?

Cheapest Frontier flights from Ontario to Seattle

Direct flights from Ontario to Seattle on Frontier

Last minute deals on Cheapflights

One-way Frontier flights to Seattle from Ontario

Average price of Frontier flights from Ontario to Seattle

Plan your Frontier flight from Ontario to Seattle by taking into account the cheapest months to travel. The average price of a one-way Frontier flight from Ontario to Seattle is currently $29 while a round-trip flight costs $57. Price data was last updated on April 28, 2024.

Temperature and rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average temperature and rainfall totals by month.

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly from Ontario to Seattle on another airline
Consider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Consider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Other Frontier flights from Ontario
Browse through other Frontier flights departing from Ontario. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Browse through other Frontier flights departing from Ontario. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Complete your trip
Complete your trip to Seattle by adding a car rental and/or hotel reservation to your travel itinerary.

Complete your trip to Seattle by adding a car rental and/or hotel reservation to your travel itinerary.

Other airlines servicing Ontario and Seattle
Choose from other airlines serving Ontario and Seattle.

Choose from other airlines serving Ontario and Seattle.

Other popular destinations in North America
If Seattle is not for you, choose from these other destinations located in North America. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

If Seattle is not for you, choose from these other destinations located in North America. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Popular flights with Frontier
Browse through some of the most popular routes that Frontier offers at this time. Flights are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Browse through some of the most popular routes that Frontier offers at this time. Flights are based on user searches made on Cheapflights and were last updated on May 2, 2024.

See what others are saying about Frontier

Overview

Recent reviews

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Travel Smart

Flights

Frontier flights from Ontario to Seattle (ONT - SEA)

Cheapflights users flying from Ontario to Seattle on Frontier typically fly into Seattle/Tacoma Intl and depart from Ontario. Select your dates above for pricing.

Frontier flights from Ontario to Seattle in 2024

Find detailed information about Frontier flights from Ontario to Seattle. Explore the options provided by Frontier to plan your journey from Ontario to Seattle. Data last updated May 2, 2024.

Popular in

Cheapest in

Average price (all airlines)

One-way from

Round-trip from

Can I get a flight from Ontario to Seattle on Frontier for under $300?

How do most travelers feel about Frontier?

Cheapest Frontier flights from Ontario to Seattle

Direct flights from Ontario to Seattle on Frontier

Last minute deals on Cheapflights

One-way Frontier flights to Seattle from Ontario

Average price of Frontier flights from Ontario to Seattle

Plan your Frontier flight from Ontario to Seattle by taking into account the cheapest months to travel. The average price of a one-way Frontier flight from Ontario to Seattle is currently $29 while a round-trip flight costs $57. Price data was last updated on April 28, 2024.

Temperature and rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average temperature and rainfall totals by month.

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly from Ontario to Seattle on another airlineConsider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

Consider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.

See what others are saying about Frontier

Overview

100% Free

Book with Flexibility

Travel Smart

Fly from Ontario to Seattle on another airline
Consider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on May 2, 2024.