Flights to Rancho Cucamonga from Seattle - $69

View $69 flight on Sat, Aug 30, 2025Opens in a new window

Popular airlines from Seattle to Rancho Cucamonga

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Seattle to Rancho Cucamonga (SEA-QLA)

Prices were available within the past 7 days and start at $69 for one-way flights and $121 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Aug 20 - Tue, Aug 26
SEA
Seattle
ONT
Ontario
$121 Roundtrip, found 9 hours ago
$121
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Wed, Aug 20 from Seattle to Ontario, returning Tue, Aug 26, priced at $121 found 9 hours ago
Frontier Airlines
Fri, Sep 26 - Thu, Oct 2
SEA
Seattle
ONT
Ontario
$122 Roundtrip, found 5 hours ago
$122
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Fri, Sep 26 from Seattle to Ontario, returning Thu, Oct 2, priced at $122 found 5 hours ago
Alaska Airlines
Tue, Sep 30 - Fri, Oct 3
SEA
Seattle
ONT
Ontario
$155 Roundtrip, found 5 hours ago
$155
Roundtrip
found 5 hours ago
Select Alaska Airlines flight, departing Tue, Sep 30 from Seattle to Ontario, returning Fri, Oct 3, priced at $155 found 5 hours ago
Delta
Sat, Sep 27 - Sat, Oct 4
SEA
Seattle
ONT
Ontario
$157 Roundtrip, just found
$157
Roundtrip
just found
Select Delta flight, departing Sat, Sep 27 from Seattle to Ontario, returning Sat, Oct 4, priced at $157 just found
Southwest Airlines
Tue, Aug 19 - Sat, Aug 23
SEA
Seattle
ONT
Ontario
$159 Roundtrip, found 5 hours ago
$159
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Tue, Aug 19 from Seattle to Ontario, returning Sat, Aug 23, priced at $159 found 5 hours ago
United
Sat, Sep 27 - Sat, Oct 4
SEA
Seattle
ONT
Ontario
$177 Roundtrip, just found
$177
Roundtrip
just found
Select United flight, departing Sat, Sep 27 from Seattle to Ontario, returning Sat, Oct 4, priced at $177 just found

Find the cheapest month to fly from Seattle (SEA) to Ontario (ONT)

October is typically the cheapest month to fly

From $65 - $187 per traveler.

Graph displaying average flight prices per month

Alternative airports near Rancho Cucamonga

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Los Angeles - Ontario Intl. ONT. Cheapest and Closest option available. Average driving time to city center is 7 minutes. Flights from $156
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city center7 min
Flights from $156
*Available to One Key members.