United Flight WN2309 Deals & Information (2025/2026)

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United Flight 2309 Route Deals From $91

The cheapest prices found with in the last 7 days for return flights were $120 and $91 for one-way flights to San Diego Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Aug 12 - Tue, Aug 26
DEN
Denver Intl.
SAN
San Diego Intl.
$120 Roundtrip, found 3 days ago
$120
Roundtrip
found 3 days ago
Select United flight, departing Tue, Aug 12 from Denver Intl. to San Diego Intl., returning Tue, Aug 26, priced at $120 found 3 days ago
Tue, Sep 9 - Sat, Sep 13
DEN
Denver Intl.
SAN
San Diego Intl.
$126 Roundtrip, found 6 days ago
$126
Roundtrip
found 6 days ago
Select United flight, departing Tue, Sep 9 from Denver Intl. to San Diego Intl., returning Sat, Sep 13, priced at $126 found 6 days ago
Fri, Aug 15 - Tue, Aug 19
DEN
Denver Intl.
SAN
San Diego Intl.
$140 Roundtrip, found 3 days ago
$140
Roundtrip
found 3 days ago
Select United flight, departing Fri, Aug 15 from Denver Intl. to San Diego Intl., returning Tue, Aug 19, priced at $140 found 3 days ago
Tue, Aug 12 - Tue, Aug 26
DEN
Denver Intl.
SAN
San Diego Intl.
$145 Roundtrip, found 3 days ago
$145
Roundtrip
found 3 days ago
Select United flight, departing Tue, Aug 12 from Denver Intl. to San Diego Intl., returning Tue, Aug 26, priced at $145 found 3 days ago

Frequently asked questions

What route does flight number UA2309 take?
Flight number UA2309 flies straight from DIA airport to San Diego Intl. Airport (SAN). During this trip, you’ll be in the air for about 2 hours and 19 minutes. It’s wise to book ahead to lock in your preferred seat.
How often is UA2309 on time?
For passengers traveling on United Airlines flight number UA2309 from Denver, CO Airport (DEN-Denver Intl.) to San Diego Airport, 92% of these trips depart according to schedule. If you are delayed, you can expect to wait roughly 5 minutes on average. Thanks to this carrier’s quality service, this flight has a 4.5-star rating.
What kind of plane is on flight number UA2309?
You’ll likely find yourself hopping on board a Boeing 737-800 if you’re booked on flight number UA2309. Generally, this flight takes off from Denver, CO Airport (DEN-Denver Intl.) and comes in to land at SAN.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA2309 flight with Travelocity, please visit our Customer Service Portal.