
United Flight UA4538 Deals & Information (2025/2026)
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United Flight 4538 Route Deals From $204
The cheapest prices found with in the last 7 days for return flights were $251 and $204 for one-way flights to Philadelphia Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$251 Roundtrip, found 2 days ago
$251
Roundtrip
found 2 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$253 Roundtrip, found 5 days ago
$253
Roundtrip
found 5 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$263 Roundtrip, found 5 days ago
$263
Roundtrip
found 5 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$311 Roundtrip, found 2 days ago
$311
Roundtrip
found 2 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$337 Roundtrip, found 3 days ago
$337
Roundtrip
found 3 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$339 Roundtrip, found 3 days ago
$339
Roundtrip
found 3 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$355 Roundtrip, found 3 days ago
$355
Roundtrip
found 3 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$386 Roundtrip, found 2 days ago
$386
Roundtrip
found 2 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$395 Roundtrip, found 2 days ago
$395
Roundtrip
found 2 days ago
IAD
Washington Dulles Intl.
PHL
Philadelphia Intl.
$397 Roundtrip, found 3 days ago
$397
Roundtrip
found 3 days ago