United Flight UA2400 Deals & Information (2025/2026)

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United Flight 2400 Route Deals From $77

The cheapest prices found with in the last 7 days for return flights were $137 and $77 for one-way flights to Seattle - Tacoma Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Oct 4 - Wed, Oct 8
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$137 Roundtrip, found 12 hours ago
$137
Roundtrip
found 12 hours ago
Select United flight, departing Sat, Oct 4 from San Francisco Intl. to Seattle - Tacoma Intl., returning Wed, Oct 8, priced at $137 found 12 hours ago
Sat, Oct 4 - Wed, Oct 8
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$139 Roundtrip, found 12 hours ago
$139
Roundtrip
found 12 hours ago
Select United flight, departing Sat, Oct 4 from San Francisco Intl. to Seattle - Tacoma Intl., returning Wed, Oct 8, priced at $139 found 12 hours ago
Sat, Oct 4 - Wed, Oct 8
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$146 Roundtrip, found 12 hours ago
$146
Roundtrip
found 12 hours ago
Select United flight, departing Sat, Oct 4 from San Francisco Intl. to Seattle - Tacoma Intl., returning Wed, Oct 8, priced at $146 found 12 hours ago
Sat, Oct 4 - Wed, Oct 8
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$148 Roundtrip, found 12 hours ago
$148
Roundtrip
found 12 hours ago
Select United flight, departing Sat, Oct 4 from San Francisco Intl. to Seattle - Tacoma Intl., returning Wed, Oct 8, priced at $148 found 12 hours ago
Sun, Sep 7 - Sat, Sep 27
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$154 Roundtrip, found 18 hours ago
$154
Roundtrip
found 18 hours ago
Select United flight, departing Sun, Sep 7 from San Francisco Intl. to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $154 found 18 hours ago
Fri, Oct 3 - Wed, Oct 8
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$169 Roundtrip, found 11 hours ago
$169
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Oct 3 from San Francisco Intl. to Seattle - Tacoma Intl., returning Wed, Oct 8, priced at $169 found 11 hours ago
Sat, Oct 18 - Mon, Oct 20
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$171 Roundtrip, found 11 hours ago
$171
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Oct 18 from San Francisco Intl. to Seattle - Tacoma Intl., returning Mon, Oct 20, priced at $171 found 11 hours ago
Sat, Oct 4 - Wed, Oct 8
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$175 Roundtrip, found 12 hours ago
$175
Roundtrip
found 12 hours ago
Select United flight, departing Sat, Oct 4 from San Francisco Intl. to Seattle - Tacoma Intl., returning Wed, Oct 8, priced at $175 found 12 hours ago
Mon, Sep 15 - Tue, Sep 16
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$178 Roundtrip, found 15 hours ago
$178
Roundtrip
found 15 hours ago
Select United flight, departing Mon, Sep 15 from San Francisco Intl. to Seattle - Tacoma Intl., returning Tue, Sep 16, priced at $178 found 15 hours ago